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Pamidronate (Bisphosphonate) 💊
Related Subjects: | Calcium Physiology | Hypercalcaemia | Bisphosphonates | Osteoporosis | Osteonecrosis of the Jaw
🦷 Cancer patients need a dental check before treatment (or ASAP after starting) to reduce the risk of osteonecrosis of the jaw.
📖 About
Always check the BNF link here for the most up-to-date prescribing information. Pamidronate is an intravenous bisphosphonate used to treat hypercalcaemia of malignancy, bone metastases, and Paget’s disease.
⚙️ Mode of Action
- 🦴 A nitrogen-containing bisphosphonate that inhibits osteoclast-mediated bone resorption.
- ⬇️ Reduces release of calcium from bone into circulation.
- Prolonged binding to hydroxyapatite gives long skeletal half-life.
⚠️ Atypical femoral fractures have been reported with long-term bisphosphonate therapy (usually >5 years). Patients should report thigh, hip, or groin pain. Consider discontinuation if suspected.
💊 Indications / Dose
- Bone metastases (esp. breast cancer): 30–90 mg IV into a large vein.
- Hypercalcaemia of malignancy: IV infusion 60–90 mg (ensure hydration first).
- Paget’s disease: IV 30–60 mg, repeated as clinically indicated.
🔗 Interactions
- 📖 See BNF for full list.
- ⚠️ Caution with nephrotoxic drugs → increased risk of renal impairment.
⚠️ Cautions
- 💧 Ensure patient is well-hydrated before treatment (esp. in hypercalcaemia).
- 🦴 In osteoporosis, ensure adequate calcium + vitamin D supplementation.
- 🩺 Monitor renal function and electrolytes.
⛔ Contraindications
- 🚫 See BNF and compare with Alendronate (oral bisphosphonate).
- Renal failure or hypersensitivity to bisphosphonates.
😬 Side Effects
- 🤢 GI upset, nausea, vomiting.
- 🦷 Osteonecrosis of the jaw (rare but serious).
- 🦴 Atypical femoral fractures (long-term use).
- 🦠 Flu-like symptoms (fever, myalgia, fatigue) after infusion.
- ⚡ Hypocalcaemia (monitor calcium, phosphate, magnesium).
- 🩺 Renal toxicity (dose-related).
📚 References
- British National Formulary (BNF): Pamidronate
- MHRA Drug Safety Update: Atypical femoral fractures and osteonecrosis risk with bisphosphonates.
📝 Revisions
- Updated September 2025
| The content on this website is provided for educational and informational purposes only to support exam preparation (e.g., MLA, MRCP, USMLE) and learning. This is NOT medical advice, diagnosis, treatment, or professional guidance. It does not replace consultation with a qualified healthcare professional, official guidelines (e.g., NICE, GMC, BNF), or supervised clinical practice. Always verify information with current, authoritative sources. Makindo and its contributors accept no liability for any reliance on this content, including errors, omissions, or any resulting harm, loss, or consequences. By using this site, you agree to these terms. |
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