alendronate is a prescription medication usedto treat osteoporosis and paget's disease. it is also used to prevent osteoporosis inpostmenopausal women. alendronate is in a class of medications called bisphosphonates.these work by preventing bone breakdown and by increasing bone density.alendronate comes in tablet form. it is usually taken daily or weekly, depending on the dose,on an empty stomach with a glass of water. there is also an liquid form. it is usuallytaken once weekly on an empty stomach. some common side effects are stomach pain,heartburn, and constipation. for more information on this medication and all other medications,explore the rxwiki encyclopedia on the web or on your mobile device.