Prevacid is a medicine, the main target of which is to decrease the amount of stomach acid. It also protects the lining of the stomach and prevent erosive esophagitis, stomach ulcers, Zollinger-Ellison syndrome, duodenal ulcer, gastroesophageal reflux disease. It may also be useful for other health problems, which are not described here. If you have an allergy to Prevacid or to some components it consists of don't use it. If you have an allergy on some drugs related to it you should also avoid using of it. You should be careful in using of Prevacid if you have a liver disease. You may use this medicine alone or in complex with others drugs. But it's strongly recommended to not use it with prescription and nonprescription drugs, dietary medicine, herbal drugs. Prevacid is forbidden for using if you are taking astemizole, cisapride, terfenadine or pimozide, because it can lead to heartbeat irregularities. It's not dangerous for pregnancy and it doesn't bring harm to a new born child. But if you are going to be pregnant or already pregnant you should talk about using of Prevacid with your doctor. You should also ask your doctor if this medicine could be compound with other drugs you are taking. You should have consultancy with your doctor before using Prevacid to prevent negative effects.