Bisphoshonates act by
Refer Katzung 10/e p713 bisphoshonates are used for the treatment of post menopausal osteoporosis, steroid induced osteoporosis, Pagets disease and hypercalcemia of malignancy
Increasing the Osteoid formation
Increasing the mineralization of Osteoid
Decreasing the osteoclast mediated resorption of bone
Decreasing the parathyroid hormone receptors
Endocrinology