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# Hyoscine butylbromide (Buscopan)
## Overview
Hyoscine butylbromide is an anticholinergic medication that acts as a spasmodic, primarily on the smooth muscle of the gastrointestinal and genitourinary tracts. It works by blocking muscarinic acetylcholine receptors.
## Primary Indications
* Symptomatic relief of abdominal cramp and spasm.
* Irritable bowel syndrome (IBS).
* Biliary colic.
* Renal colic.
## Adult Dosing
* **Oral:** 10 mg to 20 mg three times daily.
* **Intramuscular/Intravenous:** 20 mg every 8 hours as needed. This route is typically used for more acute, severe pain. Maximum dose usually 100 mg daily, but this can vary based on protocol.
## Pediatric Dosing
Dosing in children is less established and should be guided by clinical judgment and local protocols.
* **Oral:** Generally 5 mg up to three times daily for older children, but caution is advised.
* **Intramuscular/Intravenous:** 10 mg every 8 hours as needed for older children. Use in young children typically requires specialist guidance.
## Dose Adjustments
* **Renal Impairment:** No specific dose adjustments are typically required due to minimal renal excretion, but caution may be advised in severe impairment.
* **Hepatic Impairment:** No specific dose adjustments are typically required.
## Contraindications
* Hypersensitivity to hyoscine butylbromide or any component of the formulation.
* Myasthenia gravis.
* Narrow-angle glaucoma.
* Tachyarrhythmias.
* Ileus or intestinal obstruction.
* Tonic dilation of the colon.
* Prostatic hypertrophy with urinary retention.
* Megacolon.
## Adverse Effects
Common adverse effects include dry mouth, blurred vision, constipation, urinary retention, and tachycardia. Less common effects include skin rash, urticaria, and dizziness.
## Key Drug Interactions
* **Anticholinergic Agents:** Increased risk of anticholinergic side effects (e.g., TCAs, antihistamines).
* **Dopamine Antagonists:** May reduce the efficacy of prokinetic drugs like metoclopramide.
* **Beta-blockers:** Increased risk of tachycardia.
## Monitoring
* Monitor for relief of symptoms.
* Monitor for adverse effects, especially in the elderly or those with pre-existing conditions (e.g., urinary retention, constipation, glaucoma).
## Clinical Pearls
* The intravenous formulation provides rapid relief for severe acute colic.
* Oral formulation is useful for managing chronic or recurrent cramping.
* Caution in patients with glaucoma, tachycardia, heart failure, or hyperthyroidism.
* Effectiveness can be variable; not effective for all types of abdominal pain.
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**Disclaimer:** This information is intended for healthcare professionals. Always consult the most current prescribing information and relevant guidelines for definitive patient care decisions.
