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# Hyoscine butylbromide
## Overview
Hyoscine butylbromide (Scopolamine butylbromide) is a quaternary ammonium antispasmodic agent. Unlike hyoscine hydrobromide, it does not cross the blood-brain barrier effectively and lacks significant central nervous system effects.
## Primary Indications
Symptomatic relief of gastrointestinal and genitourinary tract spasms, including biliary colic and irritable bowel syndrome.
## Adult Dosing
* **Oral:** 10–20 mg three to four times daily. Maximum daily dose: 80–100 mg.
* **Parenteral (IM/IV/SC):** 20 mg as a single dose; may be repeated after 30 minutes if necessary. Maximum daily dose: 100 mg.
## Pediatric Dosing
* **Children 6–12 years:** 10 mg three times daily (oral).
* **Note:** Parenteral use in children is generally reserved for specialized clinical settings; dosing should follow local institutional protocols (typically 0.3–0.5 mg/kg per dose).
## Dose Adjustments
* **Renal/Hepatic Impairment:** No formal standardized adjustments exist; however, use with caution due to slowed clearance. Monitor for enhanced anticholinergic effects.
* **Geriatric:** Start at the lowest effective dose; monitor for urinary retention and confusion.
## Contraindications
* Hypersensitivity to hyoscine butylbromide.
* Myasthenia gravis.
* Megacolon or mechanical gastrointestinal obstruction.
* Narrow-angle glaucoma.
* Tachycardia/tachyarrhythmias.
## Adverse Effects
* **Common:** Dry mouth, tachycardia, blurred vision (mydriasis), and constipation.
* **Serious:** Urinary retention, anaphylaxis, and acute glaucoma.
## Key Drug Interactions
* **Anticholinergics:** Additive effects (increased risk of dry mouth, urinary retention, sedation).
* **Dopamine Antagonists (e.g., Metoclopramide):** Antagonistic effects on GI motility.
* **Tricyclic Antidepressants:** May potentiate anticholinergic side effects.
## Monitoring
* Heart rate (tachycardia).
* Urinary output (especially in elderly males or those with prostatic hypertrophy).
* Intraocular pressure (high-risk patients).
* Symptomatic relief of abdominal pain.
## Clinical Pearls
* **CNS profile:** Because it is a quaternary ammonium compound, it has a significantly lower incidence of CNS side effects (drowsiness, hallucinations) compared to tertiary amines like scopolamine hydrobromide or atropine.
* **Administration:** If administering via IV, inject slowly to avoid transient tachycardia or hypotension.
* **Diagnostic Caution:** Ensure abdominal pain is not due to an acute surgical emergency (e.g., appendicitis/bowel obstruction) before masking symptoms with an antispasmodic.
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**Disclaimer:** This information is for educational purposes only. Drug dosing, contraindications, and availability can vary by region and clinical context. Always consult the latest local formulary, institutional protocols, and official manufacturer prescribing information (e.g., Summary of Product Characteristics or FDA label) before prescribing or administering medication.
