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# Hyoscine Butylbromide (Buscopan)
## Overview
Hyoscine butylbromide is a quaternary ammonium antimuscarinic agent. Unlike hyoscine hydrobromide, it does not cross the blood-brain barrier effectively, resulting in minimal central nervous system (CNS) effects. It acts as an antispasmodic on the smooth muscle of the gastrointestinal, biliary, and urinary tracts.
## Primary Indications
* Gastrointestinal and biliary colic.
* Spasticity of the gastrointestinal tract (e.g., irritable bowel syndrome symptoms).
* Diagnostic/radiological procedures (to reduce smooth muscle spasm).
## Adult Dosing
* **Oral:** 10–20 mg three to four times daily. Maximum: 100 mg/day.
* **IV/IM/SC:** 20 mg as a single dose. May be repeated after 30 minutes if necessary. Maximum: 100 mg/day.
## Pediatric Dosing
* **Children 6–12 years:** 10 mg orally three times daily.
* **Children >12 years:** Same as adult dosing.
* **Note:** Use in children is generally off-label or strictly per local clinical protocol; safety and efficacy data are limited. Not recommended for children <6 years.
## Dose Adjustments
* **Renal/Hepatic Impairment:** No formal standardized adjustment, but use with caution; monitor for increased side effects due to decreased clearance.
* **Elderly:** Use lower starting doses and monitor for cardiovascular and urinary retention side effects.
## Contraindications
* Hypersensitivity to hyoscine butylbromide.
* Myasthenia gravis.
* Megacolon.
* Paralytic ileus or mechanical intestinal obstruction.
* Narrow-angle glaucoma.
* Tachycardia/tachyarrhythmias.
* Urinary retention (e.g., prostatic hypertrophy).
## Adverse Effects
* **Common:** Dry mouth, tachycardia, visual disturbances (mydriasis), blurred vision, decreased sweating.
* **Serious:** Anaphylaxis, urinary retention, narrow-angle glaucoma precipitation, and tachycardia.
## Key Drug Interactions
* **Anticholinergics:** Synergistic effects (e.g., increased dry mouth, urinary retention) with antihistamines, tricyclic antidepressants, and antipsychotics.
* **Dopamine Antagonists:** Reduced effect of metoclopramide on GI motility when given concurrently.
* **Tachycardia-inducing agents:** May antagonize the effects of parasympathomimetics.
## Monitoring
* Monitor heart rate, especially in patients with pre-existing cardiac disease.
* Assess for urinary retention, particularly in elderly men with benign prostatic hyperplasia.
* Monitor for blurred vision or eye pain (signs of glaucoma).
## Clinical Pearls
* **CNS profile:** Its quaternary structure prevents significant CNS penetration; therefore, it does not provide the antiemetic or sedative effects associated with hyoscine hydrobromide (scopolamine).
* **Parenteral administration:** Rapid IV administration can cause a transient decrease in blood pressure or tachycardia; administer slowly.
* **Diagnostic use:** Often used during endoscopy to inhibit gut motility; effects are transient.
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*Disclaimer: This information is for educational purposes and does not substitute for clinical judgment. Always verify current prescribing information, local hospital protocols, and manufacturer drug monographs before prescribing or administering medication.*
