Is chlorpheniramine an antihistamine

Yes, chlorpheniramine is an antihistamine. It belongs to the first generation of antihistamines and is commonly used to relieve allergy symptoms, such as runny nose, sneezing, and itching. Chlorpheniramine works by blocking the action of histamine, a substance in the body that causes allergic reactions. However, it may cause drowsiness as a side effect due to its ability to cross the blood-brain barrier.