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For analysis, adverse events were divided into gastrointestinal (GI; predominantly nausea, altered bowel habit, and bloating), central nervous system (CNS; predominantly headache and lethargy), musculoskeletal (arthralgia or leg cramps), and skin (itching or rashes). Only adverse events considered by the investigators http://www.selleckchem.com/products/ch5424802.html to be probably or definitely related to the study medication were counted. Of the 12 women who withdrew from the study prior to visit 3, the reasons for withdrawal were GI (n?=?4), CNS (n?=?3), musculoskeletal (n?=?3), skin (n?=?1), and one woman requested to change back to weekly therapy with bisphosphonates. Of the 108 women in the study population, the numbers of reported adverse events were GI 26 (24.1%), CNS 3 (2.8%), musculoskeletal 1 (0.9%), and skin 1 (0.9%). Most of these (23/31, 74.1%) occurred in the first 3 months and settled without withdrawing medication. http://www.selleck.cn/products/Everolimus(RAD001).html The three women who withdrew from the study population between months 6 and 12 did so because of lost contact (n?=?1), disliked of the taste of strontium ranelate (n?=?1), and dyspepsia (n?=?1). All 120 women who were recruited into the study were included in the intention-to-treat analysis. In the bisphosphonate-naive group, BMD increased significantly after 1?year at the spine (0.043?g/cm2, 5.2%, p? http://www.selleckchem.com/products/azd9291.html or heel (0.001?g/cm2, 0.3%, p?=?.93). The increase in BMD was significantly greater in the bisphosphonate-naive group at all sites. After 1?year, P1NP, CTX, and BSAP had increased significantly in the prior bisphosphonate group by 47.5%, 52.0%, and 39.3%, respectively. In the bisphosphonate-naive group after 1?year, there was a significant reduction in P1NP (�C11.6%, p?=?.011) and CTX (�C7.5%, p?=?.004), whereas the increase in BSAP was not significant (+5.2%, p?=?.50). This is the first study to investigate the BMD response to switching osteoporosis therapy from a bisphosphonate to strontium ranelate. In this study, the bisphosphonate-naive group achieved increases in BMD at the spine and hip that are comparable to those seen in the phase 3 SOTI study.1 However, the prior bisphosphonate group had significant blunting of the BMD response to strontium ranelate at all three sites studied. More than 50% of the BMD response to strontium ranelate is thought to be due to the attenuation artefact caused by strontium's high atomic mass.2, 15 Therefore, a large proportion of the blunting of the BMD response to strontium is likely to reflect poor strontium uptake into the bone.