Could use of alendronate sodium cause diarrhea in a 77-year-old woman?
• A: Alendronate (Fosamax) belongs to the group of drugs known as a bisphosphonates. Alendronate is used for the prevention and treatment of osteoporosis. Gastrointestinal side effects are common and include abdominal pain, nausea, upset stomach, and diarrhea. Other side effects include muscle and joint pain and headache. This is not a complete list of the side effects associated with alendronate.