According to WebMD, there are many possible side effects of Prevacid, most of which are considered severe. These include itching, rash, diarrhea and dizziness. Other less common side effects include nausea, stomach cramps, change in appetite, head pain and incomplete or infrequent bowel movements. WebMD cites a very long and varied list of rare side effects of Prevacid, such as depression, lung fibrosis, hemolytic anemia and decreased blood platelets.
Prevacid, also known as lansoprazole, is commonly used to treat gastric and duodenal ulcers, heartburn, reflux esophagitis and gastroesophageal reflux disease. MediResource states that some doctors also prescribe Prevacid in conjunction with antibiotics to treat a cause of duodenal ulcers known as H. pylori bacteria.
Women who are pregnant or breastfeeding, adults over 60 years of age and people with reduced liver function or liver disease are cautioned by WebMD to speak with a doctor in-depth about the safety of taking Prevacid. Certain drugs may interact with Prevacid, such as warfarin, digoxin, iron salts, methotrexate, clopidogrel and sucralfate. Doctors should also be alerted to any caffeine, nicotine or alcohol use by a patient, as these substances have frequently been known to interact with or reduce the efficacy of many prescription drugs.