Chlorpromazine is used also in the treatment of certain types of porphyria, and with other medicines in the treatment of tetanus. Phenothiazines may also be used for other conditions as determined by your doctor. Related Documents 4. USP DI Vol. 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 5. Related Documents 6. Related Documents 7. USP DI Vol. Antihistamines are used to relieve or prevent the symptoms of hay fever and other types of allergy.