Chlorpheniramine is an antihistamine that reduces the effects of natural chemical histamine in the body. Histamine can produce symptoms of sneezing, itching, watery eyes, and runny nose.
Chlorpheniramine is used to treat runny nose, sneezing, itching, and watery eyes caused by allergies, the common cold, or the flu.
Chlorpheniramine may also be used for purposes not listed in this medication guide.
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Stop using chlorpheniramine and call your doctor at once if you have:
fast or uneven heart rate;
tremor, seizure (convulsions);
easy bruising or bleeding, unusual weakness;
feeling short of breath; or
little or no urinating.
Common side effects may include:
dry mouth, nose, or throat;
blurred vision; or
feeling nervous or restless.
Usual Adult Dose for Allergic Rhinitis Tablets or syrup: 4 mg orally every 4 to 6 hours. Sustained-release: 8 to 16 mg orally every 8 to 12 hours as needed or 16 mg orally once a day as needed. Maximum dose 32 mg/day.