What is dextromethorphan and promethazine?

Dextromethorphan and promethazine is a prescription medication used to treat the symptoms of colds and allergies. This includes coughing, sneezing, watery eyes, and runny nose. It is a combination of two drugs. Dextromethorphan is a cough suppressant that works to control the brain signals that trigger coughing. Promethazine is an antihistamine that treats sneezing, watery eyes, and runny nose by hindering the impact of the chemical in the body known as histamine.

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What should I know before taking cromolyn?
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