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Propantheline 💊
📖 About
Always check the BNF link here for the latest guidance.
⚙️ Mode of Action
- 🛑 Propantheline is an antimuscarinic agent (quaternary ammonium compound).
- Blocks muscarinic ACh receptors in the GI tract → ↓ smooth muscle spasm & ↓ secretions.
- 🚫 Poor CNS penetration (unlike tertiary amines e.g. oxybutynin) → fewer central side effects.
💊 Indications / Dose
- 🍽️ Irritable Bowel Syndrome (IBS) & Bowel Spasm: 15 mg TDS 1 hr before meals + 30 mg at night (max 120 mg/day).
- 🩺 Historically used in peptic ulcer disease (rare now due to PPIs).
🔄 Interactions
- ⚠️ Additive anticholinergic burden with: tricyclics, antihistamines, antipsychotics.
⚠️ Cautions
- 👵 Elderly: higher risk of confusion, constipation, urinary retention.
- 🧠 Use with caution in autonomic neuropathy.
- 💩 Can mask underlying pathology in diarrhoea.
⛔ Contraindications
- 💪 Myasthenia gravis.
- 🚫 Paralytic ileus, pyloric stenosis.
- 👁️ Untreated angle-closure glaucoma.
🤒 Side Effects
- 👄 Dry mouth, 👓 blurred vision, 🚽 constipation, 💧 urinary retention.
- ❤️ Tachycardia, flushing.
- 🧠 CNS: dizziness/confusion (less frequent than tertiary amines).
🧠 Teaching Pearls
💡 Propantheline is quaternary → poor CNS penetration → fewer central side effects (contrast with oxybutynin, a tertiary amine that often causes drowsiness/confusion).
💡 Exam tip: In IBS with troublesome cramping, propantheline or hyoscine butylbromide may be used for short-term symptom relief, but long-term benefit is limited.
📚 References
- BNF: Propantheline
- Katzung BG. Basic & Clinical Pharmacology, 15th Edition.
| 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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