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# Hyoscine butylbromide (Buscopan)
## Overview
Hyoscine butylbromide is an anticholinergic medication that acts peripherally to relax smooth muscle. It is primarily used for its antispasmodic effects.
## Primary Indications
* Abdominal pain and cramping associated with gastrointestinal (GI) disorders, such as irritable bowel syndrome (IBS).
* Biliary colic.
* Renal colic.
* Pre-operative medication to reduce secretions and prevent bradycardia.
## Adult Dosing
* **Oral:** 10-20 mg 3-4 times daily. Maximum daily dose is typically 100 mg.
* **Intramuscular/Intravenous:** 20 mg every 4-6 hours as needed. Maximum daily dose is typically 100 mg. Dosing may be more frequent in specific acute settings, consult local protocol.
## Pediatric Dosing
* **Oral:** 5-10 mg (or 0.1 mg/kg) 3 times daily in children aged 6-12 years. Dosing for younger children is generally not recommended and should be based on specific clinical assessment and local guidelines. Max dose 30mg/day.
* **Intramuscular/Intravenous:** 10 mg once in children aged 6-12 years. Dosing for younger children is generally not recommended.
## Dose Adjustments
No specific dose adjustments are typically required for hepatic or renal impairment, although caution is advised due to potential accumulation in severe disease.
## Contraindications
* Hypersensitivity to hyoscine butylbromide or any other component of the formulation.
* Narrow-angle glaucoma.
* Myasthenia gravis.
* Megalocolon.
* Ileus, intestinal atony, or obstructive GI conditions.
* Tachyarrhythmias.
* Prostatic hypertrophy with urinary retention.
* Pyloric stenosis and paralytic ileus.
## Adverse Effects
Common side effects include dry mouth, blurred vision, dizziness, drowsiness, tachycardia, sweating, and urinary retention. Less common include dysphagia, constipation, and skin reactions.
## Key Drug Interactions
* **Other anticholinergics (e.g., tricyclic antidepressants, antihistamines, antiparkinsonian drugs):** Increased risk of anticholinergic side effects.
* **Dopamine antagonists (e.g., metoclopramide):** May reduce the efficacy of both drugs.
* **Beta-blockers:** May mask tachycardia produced by hyoscine.
## Monitoring
* Monitor for efficacy in pain relief.
* Monitor for anticholinergic side effects, especially in the elderly.
* Monitor urinary output in patients at risk of retention.
## Clinical Pearls
* Hyoscine butylbromide is a quaternary ammonium compound, limiting its passage across the blood-brain barrier, thus having fewer central anticholinergic effects compared to other anticholinergics like atropine.
* IV administration provides rapid onset of action for acute pain.
* Effectiveness can vary, and it may not be suitable for all types of abdominal pain.
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**Disclaimer:** This information is for educational purposes only and does not constitute medical advice. Always verify current prescribing information with the official product monograph, local formularies, or drug compendia before making clinical decisions.
