Osvyrti Accord Healthcare (Denosumab)

Denosumab is a bone‑targeting therapy used in several well‑established indications that involve excessive bone resorption.

• Postmenopausal osteoporosis: reduces vertebral, non‑vertebral and hip fracture risk.
• Osteoporosis in men at high risk of fracture: improves bone mineral density and lowers fracture incidence.
• Glucocorticoid‑induced bone loss: mitigates bone loss associated with long‑term steroid use.
• Bone metastases (skeletal‑related events): delays onset of pathological fractures and the need for radiation or surgery.
• Giant cell tumor of bone: limits tumor progression and reduces need for surgical intervention.

• Denosumab is a fully human monoclonal antibody that binds with high affinity to the receptor activator of nuclear factor‑kappa B ligand (RANKL). By preventing RANKL from interacting with its receptor RANK on osteoclast precursors, it blocks osteoclast formation, function and survival, resulting in decreased bone resorption and increased bone mass.

Denosumab may cause a range of adverse reactions, from mild to severe. Monitoring and prompt reporting of symptoms are recommended.

Common Side Effects

• Injection site pain or erythema.
• Mild hypocalcaemia.
• Upper respiratory tract infection.
• Flu‑like symptoms.
• Musculoskeletal pain.

Serious or Rare Side Effects

• Severe hypocalcaemia.
• Osteonecrosis of the jaw.
• Atypical femoral fractures.
• Serious infections.
• Dermatologic reactions such as Stevens‑Johnson syndrome.

Before initiating therapy with denosumab, consider the following precautions:

• Calcium and vitamin D status: ensure adequate supplementation to reduce hypocalcaemia risk.
• Renal function: assess kidney function, especially in patients with severe impairment.
• Dental health: obtain a dental examination before treatment and avoid invasive dental procedures during therapy.
• Pregnancy and lactation: avoid use unless clearly needed; discuss risks with a specialist.
• Concomitant medications: review other bone‑active agents to prevent overlapping effects.
• Store at 2‑8°C: keep refrigerated, protect from light, do not freeze or shake.

Denosumab can interact with several medicines, requiring attention to dosing and monitoring.

Major Interactions (Avoid)

• Calcium‑based antacids taken within 4 hours of injection: may reduce absorption.
• High‑dose vitamin D supplementation without monitoring: can exacerbate hypercalcaemia.

Moderate Interactions (Monitor Closely)

• Bisphosphonates: overlapping anti‑resorptive effects may increase risk of oversuppression of bone turnover.
• Immunosuppressants (e.g., methotrexate, TNF‑α inhibitors): may heighten infection risk.
• Hormone replacement therapy: may alter calcium metabolism.
• Concomitant chemotherapy agents: monitor for additive bone‑related toxicities.