Glucocorticoids are used by an estimated 0.5% to 1.0% of adults for management of a range of conditions, from allergies and inflammatory diseases to cancer. 1 Glucocorticoid use increases with age: more than 3% of adults older than 50 years and 5.2% older than 80 years use glucocorticoids. 2 Despite the availability of a growing number of medications to modulate immune function and/or inflammation, evidence from the Danish National Patient Registry suggests that the prevalence of glucocorticoid use has remained remarkably stable for 17 years (1999)(2000)(2001)(2002)(2003)(2004)(2005)(2006)(2007)(2008)(2009)(2010)(2011)(2012)(2013)(2014)(2015)(2016). 3 Thus, any noteworthy adverse effects associated with glucocorticoid use could have substantial consequences not only for the individual, but also for public health.An important adverse effect of glucocorticoid use is its association with the development of osteoporosis. Glucocorticoidinduced osteoporosis (GIOP) is the most common secondary cause of osteoporosis, and as many as 30% of all patients treated with systemic glucocorticoids for more than 6 months will develop GIOP. 4 Fractures are the most serious, adverse clinical outcome associated with high-dose glucocorticoid use and can occur at any skeletal site. [5][6][7] In particular, the risk for vertebral fracture, the most common fracture associated with glucocorticoid use, increases as soon as 3 months and peaks at 12 months after initiating glucocorticoid use. 8 Hip fractures are less common with long-term glucocorticoid use, but are an important adverse outcome owing to related high morbidity and mortality. Estimates of the annual incidence of fractures range from 2.1% in patients who have newly started treatment with glucocorticoids to 5.1% among those with long-term use. 9 The risk for fracture increases with both the dose and duration of glucocorticoid use. For example, at doses of 5 to 7.5 mg of prednisolone, the risk of clinical vertebral fractures increases 2-fold, and of hip fractures, 1.5-fold. 8 However, when high-dose glucocorticoids (30 mg of prednisolone, with a cumulative dose >5 g) are prescribed, the relative risks of vertebral and hip fractures rise 14-fold and 3-fold, respectively. Conversely, when the cumulative dose of intermittent high-dose glucocorticoids is low (<1 g), the fracture risk is much lower than that reported for doses of 1 g or higher. 10 Until recently, most of the GIOP risk attributable to glucocorticoid use was thought to be limited to systemic glucocorticoid use. However, studies of the adverse effects of cumulative doses of glucocorticoids delivered by other modes (eg, inhaled or topical) were limited by small sample sizes, narrow ranges of doses, or short durations of exposures. For example, partly owing to a perceived more favorable balance of risks and benefits, inhaled glucocorticoids are commonly prescribed for a number