If bisphosphonates are not tolerated, which alternatives are appropriate for osteoporosis?

• A. Denosumab or teriparatide
• B. Calcitonin
• C. Hormone replacement therapy
• D. Vitamin A supplementation

Answer: (A)

When bisphosphonates aren’t tolerated, the best options are agents that work by different mechanisms and have acceptable safety profiles for osteoporosis. Denosumab and teriparatide fit this need.

Denosumab is a monoclonal antibody that targets RANKL, a key signal for osteoclast formation and activity. By blocking RANKL, it slows bone resorption and helps increase bone density, reducing fracture risk. It’s given as a subcutaneous injection every six months, and because it’s not cleared the same way as bisphosphonates, it offers a useful alternative for people who can’t take bisphosphonates. Important considerations include monitoring calcium levels and recognizing that stopping denosumab can lead to rapid bone loss, so a plan for ongoing therapy is essential.

Teriparatide is an anabolic agent, a recombinant form of parathyroid hormone that stimulates new bone formation rather than just slowing breakdown. It’s particularly helpful for those with osteoporosis who have failed or cannot tolerate antiresorptives, or who have very high fracture risk. It’s given by daily subcutaneous injection for up to about two years. Patients must be evaluated for contraindications such as certain cancers, high calcium levels, or metabolic bone diseases, and they require monitoring of calcium and other labs during therapy.

Other options listed aren’t as clearly suitable in the intolerance scenario. Calcitonin can help some patients but is generally less effective for fracture prevention. Hormone replacement therapy carries significant risks (thromboembolism, cancer, cardiovascular concerns) that limit its use for osteoporosis. Vitamin A supplementation isn’t a treatment for osteoporosis and can, in excess, worsen bone health.

So, denosumab or teriparatide provide effective, mechanism-diverse alternatives when bisphosphonates can’t be used.