Alendronate and cholecalciferol is a combination medication used to treat and prevent osteoporosis. Alendronate is a bisphosphonate that slows bone loss and may help prevent fractures. Cholecalciferol is a form of vitamin D that aids calcium absorption and supports its function in the body, contributing to stronger bones. Together, they help maintain bone health and prevent bone-related issues in individuals with osteoporosis.