Dextromethorphan

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Dextromethorphan/ promethazine syrup is used for:
Temporarily relieving cough and upper respiratory symptoms due to the common cold or allergies.

Dextromethorphan/promethazine syrup is a cough suppressant/phenothiazine antihistamine combination. The antihistamine works by blocking histamine, which decreases the symptoms of allergies and helps decrease nausea and vomiting. The cough suppressant works in the cough center of the brain to reduce a dry or nonproductive cough.