Alendronate is a medication commonly used to treat and prevent osteoporosis, a condition that weakens bones and increases the risk of fractures. It belongs to a class of drugs known as bisphosphonates, which work by slowing down the process of bone loss, 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.