Paper II
2015 February (2010 Scheme) · 40 marks · 120 min

Question

Bisphosphonates

Q73 marksShort Notes

Answer

Examples: Alendronate, Risedronate, Zoledronic acid, Pamidronate

Mechanism of action

  • Bind to hydroxyapatite at sites of active bone resorption; taken up by osteoclasts, they inhibit farnesyl pyrophosphate synthase, disrupting osteoclast function and promoting apoptosis — reducing bone resorption

Uses

  • Osteoporosis, Paget’s disease, hypercalcaemia of malignancy, bone metastases

Adverse effects

  • Oesophagitis (oral use)
  • Osteonecrosis of the jaw
  • Atypical femoral fractures (long-term)
  • Acute phase reaction (IV use)
  • Hypocalcaemia

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