Alcohol may increase drowsiness and dizziness while you are taking chlorpheniramine and phenylephrine. Do not take more of this medication than is recommended. If your symptoms do not improve, or if they worsen, talk to your doctor. Chlorpheniramine is an antihistamine. It works against the naturally occurring chemical histamine in your body.
Phenylephrine is a decongestant.
Chlorpheniramine and phenylephrine may also be used for purposes other than those listed in this medication guide. A very dangerous drug interaction could occur, leading to serious side effects. You may not be able to take chlorpheniramine and phenylephrine, or you may require a lower dose or special monitoring during treatment if you have any of the conditions listed above. B. This means that it is unlikely to harm an unborn baby. Do not take this medication without first talking to your doctor if you are pregnant.