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.
Excessive sedation may occur when promethazine is combined with other medications that depress the central nervous system (brain) and cause sedation. Such drugs include ethanol, barbiturates, anti-anxiety medications, sedatives, other phenothiazines, and narcotic pain medications.
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.
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