Effects of nandrolone decanoate on forearm mineral density and calcium metabolism in osteoporotic postmenopausal women.

Although anabolic steroids have been used for many years to treat osteoporosis there is little available evidence about their efficacy or mode of action. These agents have recently been shown to produce an increase in total body calcium and bone density and it has been suggested that they stimulate bone formation. In this study 27 osteoporotic postmenopausal women were given 50 mg of nandrolone decanoate intramuscularly, every 2 or 3 weeks for 3 months, and the changes in forearm mineral density, fasting plasma, and urinary calcium, urinary hydroxyproline, and radiocalcium absorption were measured. Associated with a rise in forearm mineral density was a significant fall in fasting urinary calcium, but no significant change in fasting urinary hydroxyproline. The plasma calcium and phosphate fell significantly and there was a significant rise in the renal tubular reabsorption of calcium and a fall in the renal tubular reabsorption of phosphate. In a subset of 22 patients there was a significant rise in radiocalcium absorption. The results are consistent with the concept that nandrolone exerts a significant positive effect on bone formation and that this results in a fall in the fasting plasma calcium level, and consequently calcium excretion.