Osteoporosis is the most frequent adverse effect of glucocorticoids. Management guidelines for glucocorticoid-induced osteoporosis have been established in the United States, the United Kingdom, and many other countries. The 2004 edition of the guidelines on the management and treatment of glucocorticoid-induced osteoporosis have been proposed by The Japanese Society for Bone and Mineral Research. The subjects were patients with using or planning to use oral glucocorticoids for 3 months or longer. The criterion for starting treatment was patients with prior fragility fracture and with new fractures during treatment, patients with less bone mineral density (BMD) than 80% of young adult mean, and patients with using as a dose of 5mg/day or higher (mean daily dose) as prednisolone equivalent. The bisphosphonates have been recommended as first-line drugs and active vitamin D(3) and vitamin K(2) have been recommended as second-line drugs.