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What Is Promethazine-DM Syrup Used for?

by
author image Staci Eastin
Staci Eastin has been a licensed pharmacist for 14 years. After spending several years in the community pharmacy setting, she now works as a freelance writer. Her articles have appeared on Suite 101 and various other websites. Eastin holds a Bachelor of Science in pharmacy from the St. Louis College of Pharmacy.
What Is Promethazine-DM Syrup Used for?
Close-up of a doctor holding a small cap of medicine. Photo Credit ognianm/iStock/Getty Images

Promethazine-DM is the generic form of Phenergan-DM. It is a prescription medication available in syrup form that contains promethazine and dextromethorphan. It is used to prevent coughing and a runny nose.

Function

Promethazine is an antihistamine that lessens coughing by decreasing postnasal drip, the secretions that drain from the sinuses into the throat.

Features

Dextromethorphan is a medication that suppresses the cough reflex.

History

Dextromethorphan is a synthetic derivative of codeine, but it does not have the potential for abuse and dependence.

Considerations

The most common side effect of Promethazine-DM is drowsiness. Promethazine-DM can also cause dry mouth and dry eyes.

Interactions

Dextromethorphan should not be taken with antidepressants in the monoamine oxidase inhibitor (MAOI) or selective serotonin reuptake inhibitor (SSRI) families due to the risk of a rare but serious side effect known as serotonin syndrome.

Warning

Promethazine can sometimes cause so much drowsiness that it slows breathing to a dangerous extent. Promethazine should be used with caution in children and should not be given to children under the age of 2.

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