wii, if you're looking for help relieving heartburn, caused by acid reflux disease, relief is at hand. for many, nexium provides 24-hour heartburn relief and may be available for just $18 a month. there is risk of bone fracture and low magnesium levels. side effects may include headache, abdominal pain, and diarrhea. if you have persistent diarrhea, contact your doctor right away. other serious stomach conditions may exist. don't take nexium if you take clopidogrel. relief is at hand for just $18 a month.