4-Hydroxybutyric Acid
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Gamma Hydroxybutyric Acid.
Abiraterone
The serum concentration of Diphenhydramine can be increased when it is combined with Abiraterone.
Acepromazine
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Acepromazine.
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Aceprometazine
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Aceprometazine.
Acetaminophen
The metabolism of Acetaminophen can be decreased when combined with Diphenhydramine.
Acetylcholine
The metabolism of Acetylcholine can be decreased when combined with Diphenhydramine.
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Acetylcholine Chloride
The metabolism of Acetylcholine can be decreased when combined with Diphenhydramine.
Ajmaline
The metabolism of Ajmaline can be decreased when combined with Diphenhydramine.
Alfaxalone
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Alfaxalone.
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Alfentanil
The risk or severity of adverse effects can be increased when Alfentanil is combined with Diphenhydramine.
Almotriptan
The metabolism of Almotriptan can be decreased when combined with Diphenhydramine.
Alogliptin
The metabolism of Alogliptin can be decreased when combined with Diphenhydramine.
Alphaprodine
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Alphaprodine.
Alprazolam
The risk or severity of adverse effects can be increased when Alprazolam is combined with Diphenhydramine.
Alprenolol
The metabolism of Alprenolol can be decreased when combined with Diphenhydramine.
Aminopyrine
The metabolism of Aminophenazone can be decreased when combined with Diphenhydramine.
Amiodarone
The metabolism of Diphenhydramine can be decreased when combined with Amiodarone.
Amisulpride
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Amisulpride.
Amitriptyline
The metabolism of Amitriptyline can be decreased when combined with Diphenhydramine.
Amobarbital
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Amobarbital.
Amoxapine
The metabolism of Amoxapine can be decreased when combined with Diphenhydramine.
Amphetamine
The metabolism of Amphetamine can be decreased when combined with Diphenhydramine.
Amprenavir
The metabolism of Amprenavir can be decreased when combined with Diphenhydramine.
Amsacrine
The metabolism of Amsacrine can be decreased when combined with Diphenhydramine.
Anagrelide
Diphenhydramine may increase the QTc-prolonging activities of Anagrelide.
Antipyrine
The metabolism of Antipyrine can be decreased when combined with Diphenhydramine.
Apalutamide
The serum concentration of Diphenhydramine can be decreased when it is combined with Apalutamide.
Aprepitant
The metabolism of Diphenhydramine can be increased when combined with Aprepitant.
Aprindine
The metabolism of Aprindine can be decreased when combined with Diphenhydramine.
Arformoterol
The metabolism of Arformoterol can be decreased when combined with Diphenhydramine.
Aripiprazole
The serum concentration of Aripiprazole can be increased when it is combined with Diphenhydramine.
Armodafinil
The metabolism of Diphenhydramine can be decreased when combined with Armodafinil.
Arsenic Trioxide
Diphenhydramine may increase the QTc-prolonging activities of Arsenic trioxide.
Artemether
Diphenhydramine may increase the QTc-prolonging activities of Artemether.
Articaine
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Articaine.
Asenapine
Diphenhydramine may increase the QTc-prolonging activities of Asenapine.
Astemizole
The metabolism of Astemizole can be decreased when combined with Diphenhydramine.
Atomoxetine
The metabolism of Diphenhydramine can be decreased when combined with Atomoxetine.
Azelastine
Diphenhydramine may increase the central nervous system depressant (CNS depressant) activities of Azelastine.
Azithromycin
The metabolism of Diphenhydramine can be decreased when combined with Azithromycin.
Baclofen
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Baclofen.
Barbital
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Barbital.
Bedaquiline
Diphenhydramine may increase the QTc-prolonging activities of Bedaquiline.
Benoxinate
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Oxybuprocaine.
Benperidol
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Benperidol.
Benzocaine
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Benzocaine.
Benzphetamine
Benzphetamine may decrease the sedative activities of Diphenhydramine.
Benztropine
The metabolism of Benzatropine can be decreased when combined with Diphenhydramine.
Benzyl Alcohol
The metabolism of Benzyl alcohol can be decreased when combined with Diphenhydramine.
Benzylpenicilloyl polylysine
Diphenhydramine may decrease effectiveness of Benzylpenicilloyl Polylysine as a diagnostic agent.
Bepridil
The metabolism of Bepridil can be decreased when combined with Diphenhydramine.
BETAHISTINE
The therapeutic efficacy of Betahistine can be decreased when used in combination with Diphenhydramine.
Betaxolol
The metabolism of Betaxolol can be decreased when combined with Diphenhydramine.
Bisoprolol
The metabolism of Bisoprolol can be decreased when combined with Diphenhydramine.
Bortezomib
The metabolism of Diphenhydramine can be decreased when combined with Bortezomib.
Brexpiprazole
The serum concentration of Brexpiprazole can be increased when it is combined with Diphenhydramine.
Brimonidine
Brimonidine may increase the central nervous system depressant (CNS depressant) activities of Diphenhydramine.
Bromazepam
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Bromazepam.
Bromperidol
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Bromperidol.
Brompheniramine
The metabolism of Brompheniramine can be decreased when combined with Diphenhydramine.
Brotizolam
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Brotizolam.
Bupivacaine
The metabolism of Bupivacaine can be decreased when combined with Diphenhydramine.
Buprenorphine
Diphenhydramine may increase the central nervous system depressant (CNS depressant) activities of Buprenorphine.
Bupropion
The metabolism of Diphenhydramine can be decreased when combined with Bupropion.
Buspirone
The metabolism of Buspirone can be decreased when combined with Diphenhydramine.
Butabarbital
The risk or severity of adverse effects can be increased when Butabarbital is combined with Diphenhydramine.
Butalbital
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Butalbital.
Butamben
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Butamben.
Butobarbital
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Butethal.
Butorphanol
The risk or severity of adverse effects can be increased when Butorphanol is combined with Diphenhydramine.
Caffeine
The metabolism of Diphenhydramine can be decreased when combined with Caffeine.
Capecitabine
The metabolism of Diphenhydramine can be decreased when combined with Capecitabine.
Captopril
The metabolism of Captopril can be decreased when combined with Diphenhydramine.
Carbamazepine
The metabolism of Diphenhydramine can be increased when combined with Carbamazepine.
Carbinoxamine
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Carbinoxamine.
Cariprazine
The metabolism of Cariprazine can be decreased when combined with Diphenhydramine.
Carisoprodol
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Carisoprodol.
Carteolol
The metabolism of Carteolol can be decreased when combined with Diphenhydramine.
Carvedilol
The metabolism of Carvedilol can be decreased when combined with Diphenhydramine.
Celecoxib
The metabolism of Diphenhydramine can be decreased when combined with Celecoxib.
Cephalexin
The metabolism of Cephalexin can be decreased when combined with Diphenhydramine.
CEPHALEXIN ANHYDROUS
The metabolism of Cephalexin can be decreased when combined with Diphenhydramine.
Ceritinib
The serum concentration of Diphenhydramine can be increased when it is combined with Ceritinib.
Cetirizine
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Cetirizine.
Cevimeline
The metabolism of Cevimeline can be decreased when combined with Diphenhydramine.
Chloral Hydrate
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Chloral hydrate.
Chloramphenicol
The metabolism of Diphenhydramine can be decreased when combined with Chloramphenicol.
Chlordiazepoxide
The metabolism of Chlordiazepoxide can be decreased when combined with Diphenhydramine.
Chlormethiazole
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with clomethiazole.
Chlormezanone
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Chlormezanone.
Chloroprocaine
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Chloroprocaine.
Chloroquine
The metabolism of Chloroquine can be decreased when combined with Diphenhydramine.
Chlorpheniramine
The metabolism of Chlorphenamine can be decreased when combined with Diphenhydramine.
CHLORPHENIRAMINE POLISTIREX
The metabolism of Chlorphenamine can be decreased when combined with Diphenhydramine.
Chlorpromazine
The metabolism of Diphenhydramine can be decreased when combined with Chlorpromazine.
Chlorprothixene
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Chlorprothixene.
Chlorzoxazone
The metabolism of Chlorzoxazone can be decreased when combined with Diphenhydramine.
Cholecalciferol
The metabolism of Diphenhydramine can be decreased when combined with Cholecalciferol.
Cilostazol
The metabolism of Cilostazol can be decreased when combined with Diphenhydramine.
Cimetidine
The metabolism of Diphenhydramine can be decreased when combined with Cimetidine.
Cinacalcet
The metabolism of Diphenhydramine can be decreased when combined with Cinacalcet.
Cinnarizine
The metabolism of Cinnarizine can be decreased when combined with Diphenhydramine.
Ciprofloxacin
Diphenhydramine may increase the QTc-prolonging activities of Ciprofloxacin.
Cisapride
Diphenhydramine may increase the QTc-prolonging activities of Cisapride.
Citalopram
Diphenhydramine may increase the QTc-prolonging activities of Citalopram.
Clarithromycin
Diphenhydramine may increase the QTc-prolonging activities of Clarithromycin.
Clemastine
The metabolism of Diphenhydramine can be decreased when combined with Clemastine.
Clevidipine
The metabolism of Clevidipine can be decreased when combined with Diphenhydramine.
Clevidipine butyrate
The metabolism of Clevidipine can be decreased when combined with Diphenhydramine.
Clidinium
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Clidinium.
Clidinium bromide
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Clidinium.
Clobazam
The metabolism of Diphenhydramine can be decreased when combined with Clobazam.
Clomipramine
The metabolism of Diphenhydramine can be decreased when combined with Clomipramine.
Clonazepam
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Clonazepam.
Clonidine
The metabolism of Clonidine can be decreased when combined with Diphenhydramine.
Clopidogrel
The metabolism of Diphenhydramine can be decreased when combined with Clopidogrel.
Clorazepate
The risk or severity of adverse effects can be increased when Clorazepate is combined with Diphenhydramine.
CLORAZEPIC ACID
The risk or severity of adverse effects can be increased when Clorazepate is combined with Diphenhydramine.
Clotrimazole
The metabolism of Diphenhydramine can be decreased when combined with Clotrimazole.
Clozapine
The metabolism of Clozapine can be decreased when combined with Diphenhydramine.
Cobicistat
The serum concentration of Diphenhydramine can be increased when it is combined with Cobicistat.
Cocaine
The metabolism of Diphenhydramine can be decreased when combined with Cocaine.
Codeine
The therapeutic efficacy of Codeine can be decreased when used in combination with Diphenhydramine.
Codeine Anhydrous
The therapeutic efficacy of Codeine can be decreased when used in combination with Diphenhydramine.
CODEINE POLISTIREX
The therapeutic efficacy of Codeine can be decreased when used in combination with Diphenhydramine.
Crisaborole
The metabolism of Diphenhydramine can be decreased when combined with Crisaborole.
Crizotinib
The metabolism of Diphenhydramine can be decreased when combined with Crizotinib.
Cyclizine
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Cyclizine.
Cyclobenzaprine
The metabolism of Cyclobenzaprine can be decreased when combined with Diphenhydramine.
Cyclophosphamide
The metabolism of Cyclophosphamide can be decreased when combined with Diphenhydramine.
Cyclophosphamide Anhydrous
The metabolism of Cyclophosphamide can be decreased when combined with Diphenhydramine.
Cyclosporine
The metabolism of Diphenhydramine can be decreased when combined with Cyclosporine.
Cyproheptadine
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Cyproheptadine.
Cyproterone Acetate
The serum concentration of Diphenhydramine can be decreased when it is combined with Cyproterone acetate.
Dabrafenib
The serum concentration of Diphenhydramine can be decreased when it is combined with Dabrafenib.
Dantrolene
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Dantrolene.
Dapagliflozin
The metabolism of Dapagliflozin can be decreased when combined with Diphenhydramine.
Dapiprazole
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Dapiprazole.
Darifenacin
The metabolism of Diphenhydramine can be decreased when combined with Darifenacin.
Darunavir
The serum concentration of Diphenhydramine can be increased when it is combined with Darunavir.
Dasabuvir
The metabolism of Dasabuvir can be decreased when combined with Diphenhydramine.
Debrisoquin
The metabolism of Debrisoquin can be decreased when combined with Diphenhydramine.
Deferasirox
The serum concentration of Diphenhydramine can be increased when it is combined with Deferasirox.
Delavirdine
The metabolism of Diphenhydramine can be decreased when combined with Delavirdine.
Desflurane
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Desflurane.
Desipramine
The metabolism of Diphenhydramine can be decreased when combined with Desipramine.
Desloratadine
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Desloratadine.
Desvenlafaxine
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Desvenlafaxine.
Deutetrabenazine
The risk or severity of sedation and somnolence can be increased when Diphenhydramine is combined with Deutetrabenazine.
Dexbrompheniramine
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Dexbrompheniramine.
Dexchlorpheniramine maleate
The metabolism of Dexchlorpheniramine maleate can be decreased when combined with Diphenhydramine.
Dexfenfluramine
The metabolism of Dexfenfluramine can be decreased when combined with Diphenhydramine.
Dexmedetomidine
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Dexmedetomidine.
Dexmethylphenidate
The metabolism of Dexmethylphenidate can be decreased when combined with Diphenhydramine.
Dextroamphetamine
The metabolism of Dextroamphetamine can be decreased when combined with Diphenhydramine.
Dextromethorphan
The metabolism of Dextromethorphan can be decreased when combined with Diphenhydramine.
Dextromoramide
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Dextromoramide.
Dezocine
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Dezocine.
Diazepam
The risk or severity of adverse effects can be increased when Diazepam is combined with Diphenhydramine.
Dibucaine
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Cinchocaine.
Diethylpropion
Diethylpropion may decrease the sedative activities of Diphenhydramine.
Difenoxin
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Difenoxin.
Dihydrocodeine
The metabolism of Dihydrocodeine can be decreased when combined with Diphenhydramine.
Diltiazem
The metabolism of Diltiazem can be decreased when combined with Diphenhydramine.
Dimenhydrinate
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Dimenhydrinate.
Diphenoxylate
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Diphenoxylate.
Disopyramide
Diphenhydramine may increase the QTc-prolonging activities of Disopyramide.
Dofetilide
Diphenhydramine may increase the QTc-prolonging activities of Dofetilide.
Dolasetron
The metabolism of Dolasetron can be decreased when combined with Diphenhydramine.
Domperidone
Diphenhydramine may increase the QTc-prolonging activities of Domperidone.
Donepezil
The metabolism of Donepezil can be decreased when combined with Diphenhydramine.
Dopamine
The metabolism of Dopamine can be decreased when combined with Diphenhydramine.
Dothiepin
The metabolism of Diphenhydramine can be decreased when combined with Dosulepin.
Doxazosin
The metabolism of Doxazosin can be decreased when combined with Diphenhydramine.
Doxepin
The metabolism of Doxepin can be decreased when combined with Diphenhydramine.
Doxorubicin
The metabolism of Doxorubicin can be decreased when combined with Diphenhydramine.
Doxorubicin Hydrochloride
The metabolism of Doxorubicin can be decreased when combined with Diphenhydramine.
Doxylamine
Doxylamine may increase the central nervous system depressant (CNS depressant) activities of Diphenhydramine.
Dronedarone
Diphenhydramine may increase the QTc-prolonging activities of Dronedarone.
Droperidol
Droperidol may increase the central nervous system depressant (CNS depressant) activities of Diphenhydramine.
Duloxetine
The metabolism of Diphenhydramine can be decreased when combined with Duloxetine.
Dyclonine
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Dyclonine.
Efavirenz
The metabolism of Diphenhydramine can be decreased when combined with Efavirenz.
Eletriptan
The metabolism of Eletriptan can be decreased when combined with Diphenhydramine.
Eliglustat
The serum concentration of Eliglustat can be increased when it is combined with Diphenhydramine.
Enasidenib
The metabolism of Enasidenib can be decreased when combined with Diphenhydramine.
Encainide
The metabolism of Encainide can be decreased when combined with Diphenhydramine.
Enflurane
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Enflurane.
Entacapone
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Entacapone.
Epinastine
The metabolism of Epinastine can be decreased when combined with Diphenhydramine.
Erlotinib
The metabolism of Erlotinib can be decreased when combined with Diphenhydramine.
Erythromycin
Diphenhydramine may increase the QTc-prolonging activities of Erythromycin.
Escitalopram
Diphenhydramine may increase the QTc-prolonging activities of Escitalopram.
Eslicarbazepine Acetate
The metabolism of Diphenhydramine can be decreased when combined with Eslicarbazepine acetate.
Esomeprazole
The metabolism of Diphenhydramine can be decreased when combined with Esomeprazole.
Estazolam
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Estazolam.
Eszopiclone
The risk or severity of adverse effects can be increased when Eszopiclone is combined with Diphenhydramine.
Ethanol
Diphenhydramine may increase the central nervous system depressant (CNS depressant) activities of Ethanol.
Ethchlorvynol
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Ethchlorvynol.
Ethosuximide
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Ethosuximide.
Ethotoin
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Ethotoin.
Ethyl Chloride
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Ethyl chloride.
Ethyl Loflazepate
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Ethyl loflazepate.
Ethylmorphine
The metabolism of Ethylmorphine can be decreased when combined with Diphenhydramine.
Etidocaine
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Etidocaine.
Etifoxine
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Etifoxine.
Etomidate
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Etomidate.
Etoricoxib
The metabolism of Etoricoxib can be decreased when combined with Diphenhydramine.
Etravirine
The metabolism of Diphenhydramine can be decreased when combined with Etravirine.
Ezogabine
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Ezogabine.
Felbamate
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Felbamate.
Fentanyl
The risk or severity of adverse effects can be increased when Fentanyl is combined with Diphenhydramine.
Fesoterodine
The serum concentration of the active metabolites of Fesoterodine can be increased when Fesoterodine is used in combination with Diphenhydramine.
Fexofenadine
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Fexofenadine.
Fingolimod
The metabolism of Fingolimod can be decreased when combined with Diphenhydramine.
Flecainide
The metabolism of Flecainide can be decreased when combined with Diphenhydramine.
Flibanserin
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Flibanserin.
Floxuridine
The metabolism of Diphenhydramine can be decreased when combined with Floxuridine.
Fluconazole
The metabolism of Diphenhydramine can be decreased when combined with Fluconazole.
Flunarizine
The metabolism of Flunarizine can be decreased when combined with Diphenhydramine.
Flunitrazepam
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Flunitrazepam.
Fluorouracil
The metabolism of Diphenhydramine can be decreased when combined with Fluorouracil.
Fluoxetine
The metabolism of Diphenhydramine can be decreased when combined with Fluoxetine.
Flupenthixol
Diphenhydramine may increase the QTc-prolonging activities of Flupentixol.
Fluphenazine
The metabolism of Fluphenazine can be decreased when combined with Diphenhydramine.
Flurazepam
The risk or severity of adverse effects can be increased when Flurazepam is combined with Diphenhydramine.
Fluspirilene
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Fluspirilene.
Fluticasone propionate
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Fluticasone propionate.
Fluvastatin
The metabolism of Fluvastatin can be decreased when combined with Diphenhydramine.
Fluvoxamine
The metabolism of Diphenhydramine can be decreased when combined with Fluvoxamine.
Formoterol
The metabolism of Formoterol can be decreased when combined with Diphenhydramine.
Fosphenytoin
The metabolism of Diphenhydramine can be increased when combined with Fosphenytoin.
Fospropofol
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Fospropofol.
Gabapentin
The risk or severity of adverse effects can be increased when Gabapentin is combined with Diphenhydramine.
Gabapentin Enacarbil
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Gabapentin Enacarbil.
Gadobenate
Diphenhydramine may increase the QTc-prolonging activities of Gadobenic acid.
Galantamine
The metabolism of Galantamine can be decreased when combined with Diphenhydramine.
Gefitinib
The metabolism of Gefitinib can be decreased when combined with Diphenhydramine.
Gemfibrozil
The metabolism of Diphenhydramine can be decreased when combined with Gemfibrozil.
Gemifloxacin
Diphenhydramine may increase the QTc-prolonging activities of Gemifloxacin.
Gemifloxacin Mesylate
Diphenhydramine may increase the QTc-prolonging activities of Gemifloxacin.
Glutethimide
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Glutethimide.
Goserelin
Diphenhydramine may increase the QTc-prolonging activities of Goserelin.
Granisetron
The metabolism of Granisetron can be decreased when combined with Diphenhydramine.
Guanfacine
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Guanfacine.
Halazepam
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Halazepam.
Halofantrine
The metabolism of Halofantrine can be decreased when combined with Diphenhydramine.
Haloperidol
The metabolism of Diphenhydramine can be decreased when combined with Haloperidol.
Halothane
The metabolism of Halothane can be decreased when combined with Diphenhydramine.
Heroin
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Heroin.
Hexobarbital
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Hexobarbital.
Hyaluronidase
The therapeutic efficacy of Hyaluronidase can be decreased when used in combination with Diphenhydramine.
Hyaluronidase, Ovine
The therapeutic efficacy of Hyaluronidase can be decreased when used in combination with Diphenhydramine.
Hydrocodone
Diphenhydramine may increase the central nervous system depressant (CNS depressant) activities of Hydrocodone.
HYDROCODONE POLISTIREX
Diphenhydramine may increase the central nervous system depressant (CNS depressant) activities of Hydrocodone.
Hydromorphone
The metabolism of Hydromorphone can be decreased when combined with Diphenhydramine.
Hydroxyzine
Hydroxyzine may increase the central nervous system depressant (CNS depressant) activities of Diphenhydramine.
Ibrutinib
The metabolism of Ibrutinib can be decreased when combined with Diphenhydramine.
Ibutilide
Diphenhydramine may increase the QTc-prolonging activities of Ibutilide.
Idarubicin
The metabolism of Idarubicin can be decreased when combined with Diphenhydramine.
Iloperidone
Diphenhydramine may increase the QTc-prolonging activities of Iloperidone.
Imatinib
The metabolism of Imatinib can be decreased when combined with Diphenhydramine.
Imipramine
The metabolism of Imipramine can be decreased when combined with Diphenhydramine.
Indinavir
The metabolism of Diphenhydramine can be decreased when combined with Indinavir.
INDINAVIR ANHYDROUS
The metabolism of Diphenhydramine can be decreased when combined with Indinavir.
Ipratropium Bromide
The metabolism of Ipratropium bromide can be decreased when combined with Diphenhydramine.
Ipratropium Bromide Anhydrous
The metabolism of Ipratropium bromide can be decreased when combined with Diphenhydramine.
Irbesartan
The metabolism of Diphenhydramine can be decreased when combined with Irbesartan.
Isavuconazole
The serum concentration of Diphenhydramine can be decreased when it is combined with Isavuconazole.
Isoflurane
The risk or severity of adverse effects can be increased when Isoflurane is combined with Diphenhydramine.
Isoniazid
The metabolism of Diphenhydramine can be decreased when combined with Isoniazid.
Ixazomib
The metabolism of Ixazomib can be decreased when combined with Diphenhydramine.
Ketamine
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Ketamine.
Ketazolam
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Ketazolam.
Ketoconazole
The metabolism of Diphenhydramine can be decreased when combined with Ketoconazole.
Labetalol
The metabolism of Labetalol can be decreased when combined with Diphenhydramine.
Lamotrigine
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Lamotrigine.
Leflunomide
The metabolism of Diphenhydramine can be decreased when combined with Leflunomide.
Lenvatinib
Diphenhydramine may increase the QTc-prolonging activities of Lenvatinib.
Lenvatinib Mesylate
Diphenhydramine may increase the QTc-prolonging activities of Lenvatinib.
Letermovir
The metabolism of Letermovir can be decreased when combined with Diphenhydramine.
Leuprolide
Diphenhydramine may increase the QTc-prolonging activities of Leuprolide.
Levetiracetam
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Levetiracetam.
Levobupivacaine
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Levobupivacaine.
Levocabastine
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Levocabastine.
Levocetirizine
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Levocetirizine.
Levodopa
The metabolism of Levodopa can be decreased when combined with Diphenhydramine.
Levofloxacin
Diphenhydramine may increase the QTc-prolonging activities of Levofloxacin.
Levofloxacin Anhydrous
Diphenhydramine may increase the QTc-prolonging activities of Levofloxacin.
Levomethadyl
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Levomethadyl Acetate.
Levomilnacipran
The metabolism of Levomilnacipran can be decreased when combined with Diphenhydramine.
Levorphanol
The risk or severity of adverse effects can be increased when Levorphanol is combined with Diphenhydramine.
Lidocaine
The metabolism of Diphenhydramine can be decreased when combined with Lidocaine.
Lisdexamfetamine
Lisdexamfetamine may decrease the sedative activities of Diphenhydramine.
Lisdexamfetamine Dimesylate
Lisdexamfetamine may decrease the sedative activities of Diphenhydramine.
Lisuride
The metabolism of Lisuride can be decreased when combined with Diphenhydramine.
Lithium
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Lithium.
Lithium Cation
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Lithium.
Lomustine
The metabolism of Lomustine can be decreased when combined with Diphenhydramine.
Loperamide
The metabolism of Loperamide can be decreased when combined with Diphenhydramine.
Lopinavir
The metabolism of Diphenhydramine can be decreased when combined with Lopinavir.
Loratadine
The metabolism of Loratadine can be decreased when combined with Diphenhydramine.
Lorazepam
The risk or severity of adverse effects can be increased when Lorazepam is combined with Diphenhydramine.
Lorcaserin
The metabolism of Lorcaserin can be decreased when combined with Diphenhydramine.
Lormetazepam
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Lormetazepam.
Losartan
The metabolism of Diphenhydramine can be decreased when combined with Losartan.
Lovastatin
The metabolism of Diphenhydramine can be decreased when combined with Lovastatin.
Loxapine
The risk or severity of adverse effects can be increased when Loxapine is combined with Diphenhydramine.
Luliconazole
The serum concentration of Diphenhydramine can be increased when it is combined with Luliconazole.
Lumacaftor
The serum concentration of Diphenhydramine can be decreased when it is combined with Lumacaftor.
Lumefantrine
Diphenhydramine may increase the QTc-prolonging activities of Lumefantrine.
Lurasidone
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Lurasidone.
Magnesium Sulfate
The therapeutic efficacy of Diphenhydramine can be increased when used in combination with Magnesium sulfate.
MAGNESIUM SULFATE ANHYDROUS
The therapeutic efficacy of Diphenhydramine can be increased when used in combination with Magnesium sulfate.
Manidipine
The metabolism of Diphenhydramine can be decreased when combined with Manidipine.
Maprotiline
The metabolism of Maprotiline can be decreased when combined with Diphenhydramine.
Meclizine
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Meclizine.
Melatonin
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Melatonin.
Meperidine
The metabolism of Pethidine can be decreased when combined with Diphenhydramine.
Mephentermine
Mephentermine may decrease the sedative activities of Diphenhydramine.
Mephenytoin
The metabolism of Mephenytoin can be decreased when combined with Diphenhydramine.
Mephobarbital
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Methylphenobarbital.
Mepivacaine
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Mepivacaine.
Meprobamate
The risk or severity of adverse effects can be increased when Meprobamate is combined with Diphenhydramine.
Mequitazine
The metabolism of Mequitazine can be decreased when combined with Diphenhydramine.
Mesoridazine
The metabolism of Mesoridazine can be decreased when combined with Diphenhydramine.
Metaxalone
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Metaxalone.
Methadone
The metabolism of Methadone can be decreased when combined with Diphenhydramine.
Methadyl Acetate
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Methadyl Acetate.
Methamphetamine
The metabolism of Methamphetamine can be decreased when combined with Diphenhydramine.
Methapyrilene
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Methapyrilene.
Methaqualone
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Methaqualone.
Methocarbamol
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Methocarbamol.
Methohexital
The risk or severity of adverse effects can be increased when Methohexital is combined with Diphenhydramine.
Methotrimeprazine
Diphenhydramine may increase the central nervous system depressant (CNS depressant) activities of Methotrimeprazine.
Methoxyflurane
The metabolism of Methoxyflurane can be decreased when combined with Diphenhydramine.
Methsuximide
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Methsuximide.
Methylphenidate
The metabolism of Methylphenidate can be decreased when combined with Diphenhydramine.
Methyprylon
The metabolism of Methyprylon can be decreased when combined with Diphenhydramine.
Metoclopramide
The metabolism of Metoclopramide can be decreased when combined with Diphenhydramine.
Metoprolol
The serum concentration of Metoprolol can be increased when it is combined with Diphenhydramine.
Metylperon
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Melperone.
Metyrosine
Diphenhydramine may increase the sedative activities of Metyrosine.
Mexiletine
The metabolism of Diphenhydramine can be decreased when combined with Mexiletine.
Mianserin
The metabolism of Mianserin can be decreased when combined with Diphenhydramine.
Midazolam
The risk or severity of adverse effects can be increased when Midazolam is combined with Diphenhydramine.
Midostaurin
The metabolism of Diphenhydramine can be decreased when combined with Midostaurin.
Mifepristone
The serum concentration of Diphenhydramine can be increased when it is combined with Mifepristone.
Milnacipran
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Milnacipran.
Minaprine
The metabolism of Minaprine can be decreased when combined with Diphenhydramine.
Minocycline
Minocycline may increase the central nervous system depressant (CNS depressant) activities of Diphenhydramine.
Mirabegron
The metabolism of Mirabegron can be decreased when combined with Diphenhydramine.
Mirtazapine
Diphenhydramine may increase the central nervous system depressant (CNS depressant) activities of Mirtazapine.
Moclobemide
The metabolism of Moclobemide can be decreased when combined with Diphenhydramine.
Modafinil
The metabolism of Diphenhydramine can be decreased when combined with Modafinil.
Molindone
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Molindone.
Morphine
The metabolism of Morphine can be decreased when combined with Diphenhydramine.
Moxifloxacin
Diphenhydramine may increase the QTc-prolonging activities of Moxifloxacin.
Nabilone
Nabilone may increase the central nervous system depressant (CNS depressant) activities of Diphenhydramine.
Nalbuphine
The risk or severity of adverse effects can be increased when Nalbuphine is combined with Diphenhydramine.
Nateglinide
The metabolism of Nateglinide can be decreased when combined with Diphenhydramine.
Nebivolol
The serum concentration of Nebivolol can be increased when it is combined with Diphenhydramine.
Nefazodone
The metabolism of Nefazodone can be decreased when combined with Diphenhydramine.
Nelfinavir
The metabolism of Diphenhydramine can be decreased when combined with Nelfinavir.
Netupitant
The metabolism of Netupitant can be decreased when combined with Diphenhydramine.
Nevirapine
The metabolism of Diphenhydramine can be increased when combined with Nevirapine.
Nicardipine
The metabolism of Diphenhydramine can be decreased when combined with Nicardipine.
Nicergoline
The metabolism of Nicergoline can be decreased when combined with Diphenhydramine.
Nicotine
The metabolism of Nicotine can be decreased when combined with Diphenhydramine.
Nicotine Polacrilex
The metabolism of Nicotine can be decreased when combined with Diphenhydramine.
Nifedipine
The metabolism of Nifedipine can be decreased when combined with Diphenhydramine.
Nilotinib
Diphenhydramine may increase the QTc-prolonging activities of Nilotinib.
Nitrazepam
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Nitrazepam.
Nitrofurazone
The metabolism of Nitrofural can be decreased when combined with Diphenhydramine.
Nitrous Oxide
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Nitrous oxide.
Norflurane
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Norflurane.
Normethadone
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Normethadone.
Nortriptyline
The metabolism of Nortriptyline can be decreased when combined with Diphenhydramine.
Ofloxacin
Diphenhydramine may increase the QTc-prolonging activities of Ofloxacin.
Olanzapine
The metabolism of Olanzapine can be decreased when combined with Diphenhydramine.
Olopatadine
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Olopatadine.
Omeprazole
The metabolism of Diphenhydramine can be decreased when combined with Omeprazole.
Ondansetron
The metabolism of Ondansetron can be decreased when combined with Diphenhydramine.
Opium
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Opium.
Orphenadrine
Diphenhydramine may increase the central nervous system depressant (CNS depressant) activities of Orphenadrine.
Osimertinib
The serum concentration of Diphenhydramine can be decreased when it is combined with Osimertinib.
Oxazepam
The risk or severity of adverse effects can be increased when Oxazepam is combined with Diphenhydramine.
Oxprenolol
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Oxprenolol.
Oxycodone
The metabolism of Oxycodone can be decreased when combined with Diphenhydramine.
Oxymorphone
The metabolism of Oxymorphone can be decreased when combined with Diphenhydramine.
p-Hydroxyamphetamine
Hydroxyamphetamine may decrease the sedative activities of Diphenhydramine.
Paliperidone
Diphenhydramine may increase the QTc-prolonging activities of Paliperidone.
Palonosetron
The metabolism of Palonosetron can be decreased when combined with Diphenhydramine.
Panobinostat
The serum concentration of Diphenhydramine can be increased when it is combined with Panobinostat.
Pantoprazole
The metabolism of Diphenhydramine can be decreased when combined with Pantoprazole.
Paraldehyde
Diphenhydramine may increase the central nervous system depressant (CNS depressant) activities of Paraldehyde.
Paregoric
The metabolism of Morphine can be decreased when combined with Diphenhydramine.
Paroxetine
The metabolism of Diphenhydramine can be decreased when combined with Paroxetine.
Pazopanib
The metabolism of Pazopanib can be decreased when combined with Diphenhydramine.
Peginterferon Alfa-2b
The serum concentration of Diphenhydramine can be decreased when it is combined with Peginterferon alfa-2b.
Pentamidine
The metabolism of Pentamidine can be decreased when combined with Diphenhydramine.
Pentazocine
The risk or severity of adverse effects can be increased when Pentazocine is combined with Diphenhydramine.
Pentobarbital
The risk or severity of adverse effects can be increased when Pentobarbital is combined with Diphenhydramine.
Perampanel
Perampanel may increase the central nervous system depressant (CNS depressant) activities of Diphenhydramine.
Perazine
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Perazine.
Perflutren
Diphenhydramine may increase the QTc-prolonging activities of Perflutren.
Perhexiline
The metabolism of Perhexiline can be decreased when combined with Diphenhydramine.
Perphenazine
The metabolism of Perphenazine can be decreased when combined with Diphenhydramine.
Phenacetin
The metabolism of Phenacetin can be decreased when combined with Diphenhydramine.
Phenformin
The metabolism of Phenformin can be decreased when combined with Diphenhydramine.
Phenobarbital
The metabolism of Diphenhydramine can be increased when combined with Phenobarbital.
Phenoxyethanol
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Phenoxyethanol.
Phentermine
Phentermine may decrease the sedative activities of Diphenhydramine.
PHENTERMINE RESIN
Phentermine may decrease the sedative activities of Diphenhydramine.
Phenytoin
The metabolism of Diphenhydramine can be increased when combined with Phenytoin.
Pimozide
Diphenhydramine may increase the QTc-prolonging activities of Pimozide.
Pindolol
The metabolism of Pindolol can be decreased when combined with Diphenhydramine.
Pipamperone
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Pipamperone.
Piperazine
The metabolism of Piperazine can be decreased when combined with Diphenhydramine.
Pipothiazine
The metabolism of Pipotiazine can be decreased when combined with Diphenhydramine.
Pirinitramide
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Piritramide.
Pizotyline
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Pizotifen.
Pomalidomide
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Pomalidomide.
Ponatinib
The metabolism of Ponatinib can be decreased when combined with Diphenhydramine.
Pramipexole
Diphenhydramine may increase the sedative activities of Pramipexole.
Pramoxine
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Pramocaine.
Prazepam
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Prazepam.
Pregabalin
The therapeutic efficacy of Diphenhydramine can be increased when used in combination with Pregabalin.
Prilocaine
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Prilocaine.
Primaquine
Diphenhydramine may increase the QTc-prolonging activities of Primaquine.
Primidone
The metabolism of Diphenhydramine can be increased when combined with Primidone.
Procainamide
Diphenhydramine may increase the QTc-prolonging activities of Procainamide.
Procaine
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Procaine.
Prochlorperazine
The metabolism of Prochlorperazine can be decreased when combined with Diphenhydramine.
Progesterone
The metabolism of Progesterone can be decreased when combined with Diphenhydramine.
Promazine
The metabolism of Diphenhydramine can be decreased when combined with Promazine.
Promethazine
The metabolism of Promethazine can be decreased when combined with Diphenhydramine.
Propafenone
The serum concentration of Diphenhydramine can be increased when it is combined with Propafenone.
Proparacaine
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Proparacaine.
Propofol
The metabolism of Propofol can be decreased when combined with Diphenhydramine.
Propoxyphene
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Dextropropoxyphene.
Propranolol
The metabolism of Propranolol can be decreased when combined with Diphenhydramine.
Protriptyline
The metabolism of Protriptyline can be decreased when combined with Diphenhydramine.
Pseudoephedrine
The metabolism of Pseudoephedrine can be decreased when combined with Diphenhydramine.
Pyrimethamine
The metabolism of Diphenhydramine can be decreased when combined with Pyrimethamine.
Quazepam
The serum concentration of Diphenhydramine can be increased when it is combined with Quazepam.
Quetiapine
Diphenhydramine may increase the QTc-prolonging activities of Quetiapine.
Quetiapine fumarate
Diphenhydramine may increase the QTc-prolonging activities of Quetiapine.
Quinidine
The metabolism of Diphenhydramine can be decreased when combined with Quinidine.
Quinine
Diphenhydramine may increase the QTc-prolonging activities of Quinine.
Ramelteon
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Ramelteon.
Ranitidine
The metabolism of Ranitidine can be decreased when combined with Diphenhydramine.
Ranolazine
The metabolism of Diphenhydramine can be decreased when combined with Ranolazine.
Remifentanil
The risk or severity of adverse effects can be increased when Remifentanil is combined with Diphenhydramine.
Remoxipride
The metabolism of Remoxipride can be decreased when combined with Diphenhydramine.
Reserpine
The risk or severity of adverse effects can be increased when Reserpine is combined with Diphenhydramine.
Rifampin
The metabolism of Diphenhydramine can be increased when combined with Rifampicin.
Rifapentine
The metabolism of Diphenhydramine can be increased when combined with Rifapentine.
Risperidone
The metabolism of Risperidone can be decreased when combined with Diphenhydramine.
Ritonavir
The metabolism of Diphenhydramine can be decreased when combined with Ritonavir.
Rolapitant
The metabolism of Diphenhydramine can be decreased when combined with Rolapitant.
Ropinirole
Diphenhydramine may increase the sedative activities of Ropinirole.
Ropivacaine
The metabolism of Ropivacaine can be decreased when combined with Diphenhydramine.
Rotigotine
Diphenhydramine may increase the sedative activities of Rotigotine.
Rucaparib
The metabolism of Rucaparib can be decreased when combined with Diphenhydramine.
Rufinamide
The risk or severity of adverse effects can be increased when Rufinamide is combined with Diphenhydramine.
Saquinavir
The metabolism of Saquinavir can be decreased when combined with Diphenhydramine.
Saquinavir Mesylate
The metabolism of Saquinavir can be decreased when combined with Diphenhydramine.
Scopolamine
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Scopolamine.
Scopolamine Hydrobromide
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Scopolamine.
Secobarbital
The metabolism of Diphenhydramine can be increased when combined with Secobarbital.
Sertindole
The metabolism of Sertindole can be decreased when combined with Diphenhydramine.
Sertraline
The metabolism of Sertraline can be decreased when combined with Diphenhydramine.
Sevoflurane
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Sevoflurane.
Sildenafil
The metabolism of Sildenafil can be decreased when combined with Diphenhydramine.
Simeprevir
The metabolism of Diphenhydramine can be decreased when combined with Simeprevir.
Simvastatin
The metabolism of Simvastatin can be decreased when combined with Diphenhydramine.
Sodium Oxybate
Sodium oxybate may increase the central nervous system depressant (CNS depressant) activities of Diphenhydramine.
Sorafenib
The metabolism of Diphenhydramine can be decreased when combined with Sorafenib.
Sotalol
Diphenhydramine may increase the QTc-prolonging activities of Sotalol.
Sufentanil
The risk or severity of adverse effects can be increased when Sufentanil is combined with Diphenhydramine.
Sulfadiazine
The metabolism of Diphenhydramine can be decreased when combined with Sulfadiazine.
Sulfamethoxazole
The metabolism of Diphenhydramine can be decreased when combined with Sulfamethoxazole.
Sulfisoxazole
The metabolism of Diphenhydramine can be decreased when combined with Sulfisoxazole.
Sulpiride
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Sulpiride.
Suvorexant
Diphenhydramine may increase the central nervous system depressant (CNS depressant) activities of Suvorexant.
Tamoxifen
The serum concentration of the active metabolites of Tamoxifen can be reduced when Tamoxifen is used in combination with Diphenhydramine resulting in a loss in efficacy.
Tamsulosin
The metabolism of Tamsulosin can be decreased when combined with Diphenhydramine.
Tapentadol
Tapentadol may increase the central nervous system depressant (CNS depressant) activities of Diphenhydramine.
Tasimelteon
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Tasimelteon.
technetium Tc 99m tilmanocept
Diphenhydramine may decrease effectiveness of Technetium Tc-99m tilmanocept as a diagnostic agent.
Tegaserod
The metabolism of Tegaserod can be decreased when combined with Diphenhydramine.
Telavancin
Diphenhydramine may increase the QTc-prolonging activities of Telavancin.
Telithromycin
Diphenhydramine may increase the QTc-prolonging activities of Telithromycin.
Temazepam
The risk or severity of adverse effects can be increased when Temazepam is combined with Diphenhydramine.
Tenofovir Disoproxil
The metabolism of Diphenhydramine can be decreased when combined with Tenofovir disoproxil.
Terbinafine
The metabolism of Diphenhydramine can be decreased when combined with Terbinafine.
Terfenadine
The metabolism of Terfenadine can be decreased when combined with Diphenhydramine.
Teriflunomide
The serum concentration of Diphenhydramine can be decreased when it is combined with Teriflunomide.
Tetrabenazine
Diphenhydramine may increase the QTc-prolonging activities of Tetrabenazine.
Tetracaine
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Tetracaine.
Tetracaine hydrochloride
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Tetracaine.
Tetrahydrocannabinol
Dronabinol may increase the central nervous system depressant (CNS depressant) activities of Diphenhydramine.
Thalidomide
Diphenhydramine may increase the central nervous system depressant (CNS depressant) activities of Thalidomide.
Theophylline
The metabolism of Diphenhydramine can be decreased when combined with Theophylline.
Theophylline anhydrous
The metabolism of Diphenhydramine can be decreased when combined with Theophylline.
Thiamylal
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Thiamylal.
Thiopental
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Thiopental.
Thiopental Sodium
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Thiopental.
Thioridazine
The serum concentration of Thioridazine can be increased when it is combined with Diphenhydramine.
Thiotepa
The metabolism of Diphenhydramine can be decreased when combined with Thiotepa.
Thiothixene
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Thiothixene.
Tiagabine
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Tiagabine.
Tiapride
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Tiapride.
Ticagrelor
The metabolism of Diphenhydramine can be decreased when combined with Ticagrelor.
Ticlopidine
The metabolism of Diphenhydramine can be decreased when combined with Ticlopidine.
Timolol
The metabolism of Timolol can be decreased when combined with Diphenhydramine.
Timolol Anhydrous
The metabolism of Timolol can be decreased when combined with Diphenhydramine.
Tiotropium
The metabolism of Tiotropium can be decreased when combined with Diphenhydramine.
Tipranavir
The metabolism of Diphenhydramine can be decreased when combined with Tipranavir.
Tizanidine
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Tizanidine.
Tolbutamide
The metabolism of Diphenhydramine can be decreased when combined with Tolbutamide.
Tolcapone
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Tolcapone.
Tolterodine
The metabolism of Tolterodine can be decreased when combined with Diphenhydramine.
Topiramate
The metabolism of Diphenhydramine can be decreased when combined with Topiramate.
Toremifene
Diphenhydramine may increase the QTc-prolonging activities of Toremifene.
Trabectedin
The metabolism of Trabectedin can be decreased when combined with Diphenhydramine.
Tramadol
The therapeutic efficacy of Tramadol can be decreased when used in combination with Diphenhydramine.
Tranylcypromine
The metabolism of Diphenhydramine can be decreased when combined with Tranylcypromine.
Trazodone
The metabolism of Trazodone can be decreased when combined with Diphenhydramine.
Triazolam
The risk or severity of adverse effects can be increased when Triazolam is combined with Diphenhydramine.
Triazulenone
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Loprazolam.
Trifluoperazine
The risk or severity of adverse effects can be increased when Trifluoperazine is combined with Diphenhydramine.
Triflupromazine
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Triflupromazine.
Trimethoprim
The metabolism of Diphenhydramine can be decreased when combined with Trimethoprim.
Trimipramine
The metabolism of Trimipramine can be decreased when combined with Diphenhydramine.
Triprolidine
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Triprolidine.
Umeclidinium
The metabolism of Umeclidinium can be decreased when combined with Diphenhydramine.
Urethane
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Ethyl carbamate.
Valbenazine
The metabolism of Valbenazine can be decreased when combined with Diphenhydramine.
Valproate
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Valproic Acid.
Valproic Acid
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Valproic Acid.
Valsartan
The metabolism of Diphenhydramine can be decreased when combined with Valsartan.
Vandetanib
Diphenhydramine may increase the QTc-prolonging activities of Vandetanib.
Vemurafenib
The serum concentration of Diphenhydramine can be increased when it is combined with Vemurafenib.
Venlafaxine
The metabolism of Diphenhydramine can be decreased when combined with Venlafaxine.
Vigabatrin
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Vigabatrin.
Vilazodone
The metabolism of Vilazodone can be decreased when combined with Diphenhydramine.
Vinblastine
The metabolism of Vinblastine can be decreased when combined with Diphenhydramine.
Vinorelbine
The metabolism of Vinorelbine can be decreased when combined with Diphenhydramine.
Voriconazole
The metabolism of Diphenhydramine can be decreased when combined with Voriconazole.
Vortioxetine
The metabolism of Vortioxetine can be decreased when combined with Diphenhydramine.
Yohimbine
The metabolism of Yohimbine can be decreased when combined with Diphenhydramine.
Zafirlukast
The metabolism of Diphenhydramine can be decreased when combined with Zafirlukast.
Zalcitabine
The metabolism of Zalcitabine can be decreased when combined with Diphenhydramine.
Zaleplon
The risk or severity of adverse effects can be increased when Zaleplon is combined with Diphenhydramine.
Ziconotide
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Ziconotide.
Ziprasidone
Diphenhydramine may increase the QTc-prolonging activities of Ziprasidone.
Zolpidem
Diphenhydramine may increase the central nervous system depressant (CNS depressant) activities of Zolpidem.
Zonisamide
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Zonisamide.
Zopiclone
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Zopiclone.
Zotepine
The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Zotepine.
Zuclopenthixol
Diphenhydramine may increase the QTc-prolonging activities of Zuclopenthixol.
