Fexofenadine (Alernex) is an antihistamine, prescribed for seasonal allergic reactions such as runny nose, sneezing, red, itchy, or watery eyes; itching. It blocks histamine's action, which reduces allergy symptoms.
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A: According to several studies, cetirizine tends to have a longer duration of action than Alernex and is more effective at treating allergic rhinitis and urticaria symptoms (1✔✔Trusted Source Comparative efficacy of cetirizine and fexofenadine for seasonal allergic rhinitis, 5-12 hours postdose, in the environmental exposure unit
A: Alernex is one of the least sedatives of the second-generation antihistamines. Even at dosages higher than recommended, it does not significantly cross the blood-brain barrier (2✔✔Trusted Source Safety of second generation antihistamines
A: Alernex is available as a tablet and an oral suspension and is usually taken once or twice a day. This medication will work better if it is not taken with orange juice, grapefruit juice, or apple juice (3✔✔Trusted Source Fexofenadine : Medlineplus
A: When alcohol is taken with Alernex, it will make you feel sleepy. It is better to avoid alcohol when you are taking this medication, especially when you have to be alert or work with heavy machinery (4✔✔Trusted Source Fexofenadine : Interaction with Food, Herbs and Alcohol
A: Alernex tablets and orally disintegrating tablets are not recommended for use in children younger than 6 years of age. The oral suspension is FDA-approved for prescription use in children 6 months and older and for over-the-counter use in children 2 years and older (5✔✔Trusted Source Fexofenadine
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1. Comparative efficacy of cetirizine and fexofenadine for seasonal allergic rhinitis, 5-12 hours postdose, in the environmental exposure unit - (https://pubmed.ncbi.nlm.nih.gov/16270720/ )
2. Safety of second generation antihistamines - (https://pubmed.ncbi.nlm.nih.gov/10748947/ )
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