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Concept
Bisphosphonate
Summary
Bisphosphonates are a class of drugs that prevent the loss of bone density, used to treat osteoporosis and similar diseases. They are the most commonly prescribed drugs used to treat osteoporosis. They are called bisphosphonates because they have two phosphonate (PO(OH)2) groups. They are thus also called diphosphonates (bis- or di- + phosphonate).
Evidence shows that they reduce the risk of fracture in post-menopausal women with osteoporosis.
Bone tissue undergoes constant remodeling and is kept in balance (homeostasis) by osteoblasts creating bone and osteoclasts destroying bone. Bisphosphonates inhibit the digestion of bone by encouraging osteoclasts to undergo apoptosis, or cell death, thereby slowing bone loss.
The uses of bisphosphonates include the prevention and treatment of osteoporosis, Paget's disease of bone, bone metastasis (with or without hypercalcemia), multiple myeloma, primary hyperparathyroidism, osteogenesis imperfecta, fibrous dysplasia, and other conditions that exhibit bone fragility.
Bisphosphonates are used to treat osteoporosis, osteitis deformans (Paget's disease of the bone), bone metastasis (with or without hypercalcemia), multiple myeloma, and other conditions involving fragile, breakable bone.
In osteoporosis and Paget's, the most popular first-line bisphosphonate drugs are alendronate and risedronate. If these are ineffective or if the person develops digestive tract problems, intravenous pamidronate may be used. Strontium ranelate or teriparatide are used for refractory disease. The use of strontium ranelate is restricted because of increased risk of venous thromboembolism, pulmonary embolism and serious cardiovascular disorders, including myocardial infarction. In postmenopausal women, the selective estrogen receptor modulator raloxifene is occasionally administered instead of bisphosphonates. Bisphosphonates are beneficial in reducing the risk of vertebral fracture in steroid induced osteoporosis.
Bisphosphonates are recommended as a first line treatments for post-menopausal osteoporosis.
Official source
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