USP DI Vol. Related Documents 3. USP DI Vol. Antihistamines are used to relieve or prevent the symptoms of hay fever and other types of allergy. They work by preventing the effects of a substance called histamine, which is produced by the body.
Histamine can cause itching, sneezing, runny nose, and watery eyes.
Related Documents 4. USP DI Vol. Related Documents 5. USP DI Vol. Related Documents 6.