Generic name: chlorpheniramine
Ahist is used to relieve the symptoms of watery eyes, runny nose, sneezing, nose and throat itching, sinus pressure, sinus congestion, and the symptoms associated with allergies, and hay fever, and infections of upper respiratory tract including cold. It may also be used by your physician to treat certain other conditions.
It refers to antihistamines. It blocks histamine effects, which cause allergy symptoms like sneezing, and watery eyes.