Live Healthy and Strong

17Sep/090

Antihistamines

A family of drugs used to treat allergic conditions, such as itching and hives. The drugs work by blocking the action of histamine, a chemical that is released during an allergic reaction. Examples of antihistamines include diphenhydramine, promethazine, terfenadine, and chlorpheniramine.

Antihistamines

Without treatment, histamine dilates small blood vessels, causing redness and swelling; antihistamines block this effect, while preventing the irritation of nerve fibers that would otherwise cause itching. Antihistamines are the most effective treatment for hives.