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1.1 Treatment of Osteoporosis in Postmenopausal Women
Alendronate sodium tablets, USP are indicated for the treatment of osteoporosis in postmenopausal women. In postmenopausal women, alendronate sodium tablets, USP increase bone mass and reduces the incidence of fractures, including those of the hip and spine (vertebral compression fractures). [See Clinical Studies (14.1).]1.2 Prevention of Osteoporosis in Postmenopausal Women
Alendronate sodium tablets, USP are indicated for the prevention of postmenopausal osteoporosis [see Clinical Studies (14.2)].1.3 Treatment to Increase Bone Mass in Men with Osteoporosis
Alendronate sodium tablets, USP are indicated for treatment to increase bone mass in men with osteoporosis [see Clinical Studies (14.3)].1.4 Treatment of Glucocorticoid-Induced Osteoporosis
Alendronate sodium tablets, USP are indicated for the treatment of glucocorticoid-induced osteoporosis in men and women receiving glucocorticoids in a daily dosage equivalent to 7.5 mg or greater of prednisone and who have low bone mineral density [see Clinical Studies (14.4)].1.5 Treatment of Paget's Disease of Bone
Alendronate sodium tablets, USP are indicated for the treatment of Paget's disease of bone in men and women. Treatment is indicated in patients with Paget's disease of bone who have alkaline phosphatase at least two times the upper limit of normal, or those who are symptomatic, or those at risk for future complications from their disease. [See Clinical Studies (14.5).]1.6 Important Limitations of Use
The optimal duration of use has not been determined. The safety and effectiveness of alendronate sodium tablets, USP for the treatment of osteoporosis are based on clinical data of four years duration. All patients on bisphosphonate therapy should have the need for continued therapy re-evaluated on a periodic basis. Patients at low-risk for fracture should be considered for drug discontinuation after 3 to 5 years of use. Patients who discontinue therapy should have their risk for fracture re-evaluated periodically.
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Alendronate sodium is a bisphosphonate that acts as a specific inhibitor of osteoclast-mediated bone resorption.
Bisphosphonates are synthetic analogs of pyrophosphate that bind to the hydroxyapatite found in bone.
Alendronate sodium is chemically described as (4-amino-1-hydroxybutylidene) bisphosphonic acid monosodium salt trihydrate. The empirical formula of alendronate sodium is C4H12NNaO7P2∙3H2O and its formula weight is 325.12. The structural formula is:
Alendronate sodium is a white, crystalline, nonhygroscopic powder. It is soluble in water, very slightly soluble in alcohol, and practically insoluble in chloroform.
Alendronate sodium tablets, USP for oral administration contain 6.53, 13.06, 45.69 or 91.37 mg of alendronate monosodium salt trihydrate, which is the molar equivalent of 5, 10, 35 and 70 mg, respectively, of free acid, and the following inactive ingredients: microcrystalline cellulose, croscarmellose sodium, and magnesium stearate.