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Indications - Diphenhydramine is indicated for the treatment of followings: Seasonal, perennial, vasomotor rhinitis Urticaria, angioneurotic oedema, anaphylaxis Pruiritic conditions Premedication for emesis and motion sickness Miscellaneous like meniere's disease and parkinsonism

Dosage & Administration - Adult- Most allergic conditions: 25-50 mg three times a day with a further 50 mg at night. Children- 1 to 5 years of age: 5 mg i.e., 2.5 ml of elixir 4 times a day More than 6 years of age: 10 mg i.e. 5 ml of elixir 4 times a day

Side Effects - Side effect includes sedation, dizziness, tinnitus, fatigue, ataxia, blurred vision, diplopia, euphoria, and epigastric discomfort.

Contraindications - Known hypersensitivity to Diphenhydramine Hydrochloride, Ammonium chloride is contra-indicated in presence of impaired hepatic or renal function.

Others - Pregnancy & Lactation Category B: There are no adequate and well controlled studies in pregnant women using diphenhydramine hydrochloride. Therefore, diphenhydramine hydrochloride should be used in pregnancy only if clearly needed. Diphenhydramine hydrochloride has been reported to be excreted in breast milk and thus, use of diphenhydramine hydrochloride in lactating mother is not recommended. Overdose Effects Symptoms: Impaired consciousness; psychosis, seizures, antimuscarinic symptoms (e.g. mydriasis, tachycardia, tachyarrhythmias), resp failure, rhabdomyolysis; acute delirium with visual and auditory hallucination (topical). Management: Supportive and symptomatic treatment. Convulsions and marked CNS stimulation may be treated with IV diazepam.