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# Hyoscine butylbromide (Buscopan)
## Overview
Hyoscine butylbromide is a quaternary ammonium antispasmodic agent. Unlike hyoscine hydrobromide, it does not cross the blood-brain barrier significantly, resulting in fewer central nervous system (CNS) side effects. It exerts a selective antispasmodic effect on the smooth muscle of the gastrointestinal, biliary, and urinary tracts.
## Primary Indications
* Symptomatic relief of gastrointestinal and genitourinary spasms.
* Irritable Bowel Syndrome (IBS) symptom management.
* Adjunct in diagnostic procedures (e.g., endoscopy, radiology) to reduce motility.
## Adult Dosing
* **Oral:** 10–20 mg three to four times daily. Maximum: 80 mg/day (varies by local protocol).
* **Intramuscular/Intravenous/Subcutaneous:** 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.
* *Note:* Use in children under 6 years is generally not recommended or requires specialist oversight. Refer to specific institutional protocols for parenteral pediatric weight-based dosing, as it is often off-label.
## Dose Adjustments
* **Renal/Hepatic Impairment:** No specific guidelines available; use with increased caution due to potential decreased clearance. Monitor for systemic anticholinergic effects.
* **Elderly:** Increased susceptibility to anticholinergic side effects (urinary retention, tachycardia, visual disturbances). Start at the lower end of the dosing range.
## Contraindications
* Hypersensitivity to hyoscine butylbromide.
* Myasthenia gravis.
* Megacolon or paralytic ileus.
* Narrow-angle glaucoma.
* Prostatic hypertrophy or bladder neck obstruction (risk of urinary retention).
* Tachyarrhythmias.
## Adverse Effects
* **Common:** Dry mouth, visual accommodation disturbances (blurred vision), tachycardia.
* **Serious:** Urinary retention, constipation, anaphylaxis/allergic reactions, angle-closure glaucoma (triggered by pupil dilation).
## Key Drug Interactions
* **Tricyclic Antidepressants, Antihistamines, and Amantadine:** Additive anticholinergic effects.
* **Dopamine Antagonists (e.g., Metoclopramide):** Antagonistic effects on GI motility—concurrent use may neutralize the therapeutic effect of both drugs.
## Monitoring
* Monitor heart rate (risk of tachycardia).
* Assess for urinary output/retention.
* Observe for signs of increased intraocular pressure (eye pain, blurred vision).
## Clinical Pearls
* **Parenteral Administration:** Rapid IV injection can cause a sudden decrease in blood pressure or tachycardia; administer slowly.
* **Systemic Absorption:** Unlike hyoscine hydrobromide, the butylbromide salt has poor systemic absorption, which limits its systemic anticholinergic toxicity but makes it less effective for systemic conditions like seasickness.
* **Diagnostic Utility:** Used as an antispasmodic in endoscopy to decrease bowel peristalsis for clearer visualization.
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*Disclaimer: This information is for educational purposes only. Dosing protocols may vary by hospital or region. Always verify specific dosages and safety information with current institutional guidelines, local formularies, or the manufacturer’s Summary of Product Characteristics (SmPC) before prescribing or administering.*
