• Calcitonin: Calcitonin is a hormone produced by the thyroid glands. It decreases bone resorption, consequently reducing the risk of fracture in osteoporosis patients. It may also relieve bone pain due to its analgesic action (Pain killing activity). Salmon calcitonin can be administered in the form of injections or nasal spray. Side-effects of calcitonin therapy includes nausea, flu like symptoms, backache and headache. Nasal spray has fewer side-effects but may cause nose bleeding (epistaxis).