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# Hyoscine butylbromide (Buscopan)
## Overview
Hyoscine butylbromide is an anticholinergic medication that acts as a smooth muscle relaxant, primarily on the gastrointestinal tract. It works by blocking muscarinic receptors, leading to antispasmodic effects.
## Primary Indications
* Symptomatic relief of abdominal cramps and pain associated with gastrointestinal spasm.
* Used in some regions for preparation of diagnostic procedures like colonoscopies to reduce bowel motility.
## Adult Dosing
* **Oral:** 10 mg to 20 mg, three to five times daily.
* **Intramuscular/Intravenous:** 20 mg every 6 to 8 hours as needed. Maximum daily dose is typically 100 mg. Onset of action is rapid (minutes).
## Pediatric Dosing
* **Children 6-12 years:** Oral: 10 mg, two to three times daily.
* **Children under 6 years:** Oral: Data is limited, use with caution and consider alternative agents. Some sources suggest 5 mg up to three times daily, but this is off-label and not universally established.
## Dose Adjustments
No dose adjustments are typically required for hepatic or renal impairment, but caution is advised in severe cases due to potential accumulation.
## Contraindications
* Hypersensitivity to hyoscine butylbromide or any excipients.
* Myasthenia gravis.
* Untreated narrow-angle glaucoma.
* Tachyarrhythmias.
* Prostatic hypertrophy with urinary retention.
* Megalocolon.
* Ileus or gastrointestinal obstruction.
## Adverse Effects
* Anticholinergic effects: Dry mouth, blurred vision, urinary retention, constipation, tachycardia.
* Drowsiness, dizziness.
* Allergic reactions (rare).
* Injection site reactions.
## Key Drug Interactions
* **Amantadine, quinidine, tricyclic antidepressants, MAO inhibitors:** Increased anticholinergic side effects.
* **Dopamine antagonists (e.g., metoclopramide):** May reduce the efficacy of both drugs.
* **Antacids:** May reduce absorption if taken concurrently orally. Separate doses by at least 1 hour.
## Monitoring
* Monitor for effectiveness in relieving spasmodic pain.
* Observe for adverse anticholinergic effects, particularly in elderly patients or those with pre-existing conditions.
* Monitor for signs of urinary retention.
## Clinical Pearls
* Hyoscine butylbromide has a predominantly peripheral action, with minimal CNS penetration, thus possessing fewer central anticholinergic effects compared to other anticholinergics.
* Intravenous administration provides rapid relief of acute spasms.
* Effectiveness in biliary or renal colic is variable.
* Consider alternatives for patients with glaucoma, prostatic hypertrophy, or myasthenia gravis.
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*This drug information is intended for clinical decision-making and does not replace detailed prescribing information. Always verify current prescribing information and local protocols before administration.*
