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Intravenous ibandronate: in the treatment of osteoporosis.

Ibandronate (ibandronic acid) is a potent nitrogen-containing bisphosphonate that inhibits osteoclast-mediated bone resorption in women with postmenopausal osteoporosis. Recently, an intravenous (IV) formulation of ibandronate for intermittent injection, which circumvents the fasting and posture requirements associated with administration of oral bisphosphonates, was approved for use in this patient population. In initial placebo-controlled studies of 1 year's duration, IV ibandronate (< or =2mg once every 3 months) increased lumbar spine bone mineral density (BMD) and reduced levels of biochemical markers of bone turnover in a dose-dependent manner. Dosages < or =1mg every 3 months were found to be suboptimal in terms of fracture prevention in a 3-year trial. Subsequently, the large randomised, double-blind, noninferiority DIVA trial showed that, in terms of increasing lumbar spine BMD (primary endpoint), IV ibandronate 3mg once every 3 months and 2mg once every 2 months for 1 year were noninferior and also superior to oral ibandronate 2.5mg once daily, a regimen with proven antifracture efficacy. Median reductions from baseline in biochemical markers of bone turnover were similar for the IV and oral regimens. IV ibandronate was generally well tolerated in clinical trials. Treatment-related adverse events included musculoskeletal events and transient influenza-like symptoms, the latter mainly associated with the first dose.