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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 and therefore lacks significant central nervous system (CNS) effects at therapeutic doses. It acts as a peripheral anticholinergic, exerting antispasmodic effects on the smooth muscle of the gastrointestinal, biliary, and urinary tracts.
## Primary Indications
* Symptomatic relief of gastrointestinal and genitourinary smooth muscle spasms (renal or biliary colic).
* Gastrointestinal tract motility disorders (e.g., irritable bowel syndrome).
* Diagnostic or radiologic procedures (e.g., hypotonic duodenography).
## Adult Dosing
* **Oral:** 10 mg to 20 mg three to four times daily. Maximum: 100 mg/day (varies by local protocol).
* **IV/IM/SC:** 20 mg repeated every 30 minutes if needed. Maximum: 100 mg/day.
* *Note: For diagnostic procedures, 20–40 mg IV is typically administered as a single dose.*
## Pediatric Dosing
* **Children (6–12 years):** 10 mg three times daily (oral).
* **Note:** Use in children under 6 years is generally not recommended or requires specialist/local protocol guidance due to limited data and potential for anticholinergic side effects.
* **IV/IM/SC:** Not routinely recommended for children; if required, dosage is weight-based (typically 0.3–0.5 mg/kg); consult local pediatric formulary.
## Dose Adjustments
* **Renal/Hepatic Impairment:** No formal dosage adjustment guidelines exist, but use with caution due to metabolism and excretion pathways.
* **Geriatric Patients:** Use with caution; higher sensitivity to anticholinergic side effects (e.g., urinary retention, confusion, constipation).
## Contraindications
* Hypersensitivity to hyoscine butylbromide.
* Myasthenia gravis.
* Megacolon or paralytic ileus.
* Narrow-angle glaucoma.
* Prostatic hypertrophy with urinary retention.
* Tachycardia or unstable cardiovascular conditions (risk of exacerbation).
## Adverse Effects
* **Common:** Dry mouth, xerophthalmia (dry eyes), constipation, vision disorders (blurred vision/mydriasis).
* **Serious:** Tachycardia, palpitations, urinary retention, anaphylaxis/allergic skin reactions.
* **Rare:** Angle-closure glaucoma (in predisposed individuals).
## Key Drug Interactions
* **Anticholinergics/Antihistamines:** Additive anticholinergic effects (increased risk of urinary retention/constipation).
* **Dopamine Antagonists (e.g., Metoclopramide):** Antagonistic effects on GI motility; avoid concurrent use.
* **Tricyclic Antidepressants/MAOIs:** May potentiate anticholinergic effects.
## Monitoring
* Monitor heart rate (risk of tachycardia).
* Monitor for signs of urinary retention, especially in elderly male patients or those with existing prostatism.
* Ensure adequate hydration if dry mouth symptoms occur.
## Clinical Pearls
* **Lack of CNS effects:** Because it is poorly absorbed and does not cross the BBB, it avoids the side effects like sedation seen with scopolamine (hyoscine hydrobromide), but peripheral anticholinergic effects remain prominent.
* **IV Administration:** Administer slowly to avoid transient tachycardia or hypotension.
* **Pregnancy/Lactation:** Use with caution; safety data is limited. Benefits should outweigh risks.
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**Educational Disclaimer:** This information is for educational purposes only. Drug protocols, indications, and dosages can vary significantly by region and institution. Always verify dosages and contraindications with the current official product monograph or your local hospital pharmacy formulary before prescribing or administering medication.
