This depends on the individual patient's condition and response and the amount of medicine taken. Related Documents 9. 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 10. USP DI Vol. They are produced by the body and are necessary for the normal sexual development of the female and for the regulation of the menstrual cycle during the childbearing years. All rights reserved.