What is chlorpheniramine, dihydrocodeine, and phenylephrine?
Chlorpheniramine is an antihistamine. It blocks the effects of the naturally occurring chemical histamine in the body and reduces congestion. Dihydrocodeine is a narcotic. It is a pain reliever and a cough suppressant. Phenylephrine is a decongestant. It works by constricting (shrinking) blood vessels (veins and arteries) in the body. Constriction of blood vessels in the sinuses and nose decreases congestion. Chlorpheniramine, dihydrocodeine, and phenylephrine is used to treat cough and nasal congestion associated with upper respiratory tract infections and allergies. Chlorpheniramine, dihydrocodeine, and phenylephrine may also be used for purposes other than those listed in this medication guide.