Histan 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.
Histan is used to treat runny nose, sneezing, itching, and watery eyes caused by allergies, the common cold, or the flu.
Histan may also be used for purposes not listed in this medication guide.
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