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It has recently been reported that bisphosphonates are the most common treatment for osteoporotic patients. However, they are many problems, including poor bioavailability and adherence, as well as adverse drug reactions. Therefore, intravenous administration of bisphosphonates has been developed to resolve these problems. In Japan today, alendronate and ibandronate have been approved for intravenous administration, and they have advantages, such as good adherence and better gastrointestinal tolerability, compared to oral administration. We attempted to confirm the effects of administration of intravenous alendronate, which is not inferior to oral administration, for osteoporotic patients in earlier research. 200 consecutive Japanese over 70 years-old postmenopausal women who visited the first author’s orthopedic clinic and had femoral neck or lumbar spine bone mineral density (BMD) values more than 2.5 SD lower than the reference values were randomly enrolled in this study. 100 subjects were recruited for administration of intravenous alendronates because of their poor adherence, no respond of treatment status, and gastrointestinal adverse effects. Furthermore, 10 of these subjects were excluded due to discontinuation, and a total of 90 subjects were eligible for the intravenous group. The remaining 50 patients received oral alendronate. The present study also showed no significant difference between intravenous and oral administration with respect to BMD, biochemical bone turnover markers, and the incidence of fractures. These results show that intravenous administration of alendronate is not inferior to oral alendronate for the treatment of osteoporosis. Therefore, intravenous administration of alendronate can be recommended if patients do not tolerate or adhere to oral bisphosphonates.

A comparative study between intravenous and oral alendronate administration for the treatment of osteoporosis