What is clorfenamina?

Clorfenamina, known as chlorpheniramine in English, is an antihistamine commonly used to relieve allergy symptoms such as runny nose, sneezing, and itchy eyes. It works by blocking the action of histamine, a substance in the body that causes allergic symptoms. Chlorpheniramine is often found in over-the-counter cold and allergy medications. However, it may cause drowsiness as a side effect, so caution is advised when driving or operating machinery after taking it.