Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.
PREPARATIONS: Tablets: 12.5, 25, and 50 mg; Suppositories: 12.5, 25, and 50 mg; Syrup: 6.25 mg/5 ml; Injection: 25 and 50 mg/ml.
Promethazine is a phenothiazine derivative that competitively blocks histamine H1 receptors without blocking the secretion of histamine. It also is a very weak dopamine antagonist
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