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The objective of the study was to evaluate the effects of cyclical therapy with etidronate and calcium on spinal and femoral bone loss in the early post menopausal period. Fifty-four women, 53 ± 2.8 yr old (mean ± sd) and 2.3 ± 1.3 yr post menopause received oral doses of either 400 mg/day etidronate for 2 weeks followed by 500 mg/day elemental calcium for 11 weeks, or placebo for 14 days followed by calcium for 11 weeks, repeated over a total of 24 months. A statistically significant increase in spinal bone mineral density (BMD) was observed after 6 months in the etidronate group. At 2 yr, the mean treatment differences in spinal and femoral neck BMD were+ 2.93% (P &amp;lt; 0.02) and 2.02% (P &amp;lt; 0.03), respectively. Serum osteocalcin and urinary crossLaps/creatinine excretion were decreased signficantly by etidronate. Etidronate was well tolerated with a safety profile similar to that of placebo.  Thirty-seven women participated in a 1-yr open-label follow-up study. Twelve months after treatment withdrawal, spinal BMD in the former etidronate group decreased by 1.43% and serum osteocalcin and urinary crossLaps returned to pretreatment values.  In conclusion, cyclical etidronate is an effective therapy for the prevention of both trabecular and cortical bone loss in the early menopause and has a good safety profile.

Prevention of Early Postmenopausal Bone Loss with Cyclical Etidronate Therapy (A Double-Blind, Placebo-Controlled Study and 1-Year Follow-Up)*