Dextromethorphan HCl 10/15mg + Chlorpheniramine Maleate 2mg + Phenylephrine HCl 5mg is a combination medication commonly used to treat symptoms of the common cold, flu, or allergies, including cough, nasal congestion, and sneezing.

Dextromethorphan HCl (10/15mg) is a cough suppressant (antitussive) that works by affecting the signals in the brain that trigger the cough reflex, helping to reduce the urge to cough.

Chlorpheniramine Maleate (2mg) is an antihistamine that works by blocking histamine, a substance produced during allergic reactions. This helps relieve symptoms such as sneezing, runny nose, and itchy or watery eyes associated with allergies or the common cold.

Phenylephrine HCl (5mg) is a decongestant that works by narrowing the blood vessels in the nasal passages, which reduces swelling and congestion, making it easier to breathe through the nose.