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Objectives: Osteoporosis is a common skeletal disorder affecting postmenopausal women. Data suggest that postmenopausal women are at increased risk of periodontal diseases. Amino bisphosphonates are potent inhibitors of bone resorption and effectively used in the treatment of osteoporosis. Preliminary data indicate that there is a potential role for bisphosphonates in the management of periodontitis. Hence, this randomized placebo-controlled trial was designed to investigate the clinical efficacy of amino bisphosphonate on periodontal disease status among postmenopausal women. Materials and Methods: Thirty patients were randomly allocated to two treatment groups: Group A, which received scaling and root debridement and 70 mg weekly single oral dose of alendronate drug, and Group B, which received scaling and root debridement and placebo drug for 6 months. Clinical periodontal measurements were carried out for all patients at the baseline and 6 months later. Mandibular bone mineral density (BMD) was measured using a dual energy X-ray absorptiometer at the beginning of the study and the end of 6 months. Results: A weekly single oral dose of 70 mg alendronate was well-tolerated. The intragroup comparison showed significant improvement in periodontal parameters in both groups. The intergroup comparison showed a significant increase in BMD after 6 months in Group A when compared with Group B (P = 0.0179). Conclusion: Single oral dose of 70 mg alendronate per week is well-tolerable, gastro-intestinally safe, and improves the clinical outcome of nonsurgical periodontal therapy.