Antihistamines block the body's histamine reaction and lessen or prevent allergic reactions. Anyone who is allergic to antihistamines should not take them. If you are taking other drugs, check with your doctor or pharmacist before taking an antihistamine. Some drugs increase the drowsiness effect of antihistamines while other drugs reduce the histamine-blocking effect. Antacids People use antacids to relieve pain from heartburn or an ulcer.
Antacids work by neutralizing the excess stomach acid that causes pain.
Antacids have few side effects although some may cause diarrhea, others constipation. Antacids should be used for a short time only. For instance, prolonged use of calcium antacids can cause an increase in the production of stomach acid when treatment is stopped suddenly. Also, all antacids can interfere with the absorption of other drugs. If you are taking other medications, check with your doctor or pharmacist before taking an antacid.