Alendronate is a medication commonly used to treat and prevent osteoporosis, a condition that weakens bones and makes them more likely to fracture. It belongs to a class of drugs known as bisphosphonates, which work by inhibiting the activity of cells that break down bone, helping to maintain bone density and strength. Patients typically take alendronate as a once-weekly oral tablet. It is important to take the medication on an empty stomach, with a full glass of water, and to remain upright for at least 30 minutes afterward to enhance absorption and reduce the risk of gastrointestinal side effects.