The recommended daily allowance (RDA) of vitamin D for most adults aged 1 to 70 is 600 IU (15 mcg), increasing to 800 IU (20 mcg) for adults over 70. The safe upper limit for daily intake is 4,000 IU.
For adults with osteopenia, the general recommendation is 600 to 2,000 IU of Vitamin D daily, often paired with 1,000â1,200 mg of calcium, to maintain bone health and prevent further density loss. Those over 70, with limited sun exposure, or with a diagnosed deficiency may require higher doses, typically in the range of 800â2,000 IU.
Check calcium, vitamin D, and Cr. Correct low calcium and vitamin D before starting alendronate.
Prior to starting pharmacotherapy for osteoporosis, confirm the diagnosis and review the following serum tests usually performed as part of the evaluation of osteoporosis:
Correct underlying vitamin D deficit, if needed, with repeat measurement of 25-hydroxyvitamin D in approximately eight weeks
Refer patients with eGFR <30 to 35 mL/min per 1.73 m2Â to a clinician with experience in treating chronic kidney disease-mineral bone disorder.
Most women â For the initial treatment of osteoporosis in most postmenopausal women, we suggest oral bisphosphonates. We prefer these agents based on efficacy, cost, and long-term safety data. Oral bisphosphonates are contraindicated in those with esophageal disorders (eg, esophageal stricture) or known malabsorption (eg, Roux-en-Y gastric bypass).
We typically prefer alendronate, although risedronate is a reasonable alternative.
Very high fracture risk â Examples of very high fracture risk may include:
âT-score of â¤-3.0 even in the absence of fractures
âT-score of â¤-2.5 plus a fragility fracture
âSevere or multiple fragility fractures
For postmenopausal women with very high fracture risk, we suggest initial treatment with an anabolic agent (eg, teriparatide, abaloparatide, romosozumab). Anabolic therapy is most effective when given as initial therapy and should always be followed by an antiresorptive agent. Refer to a clinician with expertise in treating severe osteoporosis to facilitate shared clinical decision-making.