Side effect(s) of Methadone

Read the side effects of Methadone as described in the medical literature. In case of any doubt consult your doctor or pharmacist.
Most Common - Lightheadedness, dizziness, sedation, nausea, vomiting and sweating.

Body as a Whole - Weakness, swelling and headache.

Heart - Abnormal heart rhythm, slow/fast heart rate, ECG abnormalities, flushing, heart failure, low blood pressure, palpitations, vein inflammation, QT interval prolongation and fainting.

Gastrointestinal - Abdominal pain, loss of appetite, constipation, dry mouth and tongue inflammation.

Metabolic - Weight gain.

Central Nervous System - Agitation, confusion, disorientation, emotion, anxiety, sleeplessness and seizures.

Respiratory - Lung swelling and respiratory depression.

Skin - Itching, hives and rash.

Eye and ENT - Hallucinations and visual disturbances.

Genitourinary - Absence of menstrual periods, reduced sexual activity and/or impotence and urinary retention or hesitancy.

Other Precautions : * Avoid excess dosage.
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