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# Hyoscine butylbromide (Buscopan)
## Overview
Hyoscine butylbromide is an anticholinergic and antispasmodic agent. It works by blocking muscarinic receptors in the smooth muscle of the gastrointestinal tract, reducing spasms and associated pain.
## Primary Indications
* Symptomatic relief of abdominal pain and cramping associated with gastrointestinal spasms, such as irritable bowel syndrome (IBS) and diverticular disease.
* Pre-procedural bowel preparation in some diagnostic procedures.
## Adult Dosing
* **Oral:** 10 mg to 20 mg three to five times daily. Maximum oral dose not explicitly established but typically not to exceed 100 mg daily.
* **Injection:** 20 mg intravenously (IV), intramuscularly (IM), or subcutaneously (SC) as a single dose. May be repeated every 4-8 hours if necessary. Maximum IV dose not explicitly established but typically not to exceed 100 mg daily.
Dosing for specific indications, such as pre-procedural use, may vary based on institutional protocols.
## Pediatric Dosing
* **Oral:** 10 mg three times daily for children over 6 years of age.
* **Injection:** Available in some regions for older children; specific dosing varies and is not universally established. Consult product literature for specific age recommendations and doses if available. Generally not recommended for children under 12 years due to limited safety and efficacy data.
## Dose Adjustments
No specific dose adjustments are typically required for hepatic or renal impairment. However, caution should be exercised in elderly patients due to potential anticholinergic side effects.
## Contraindications
* Hypersensitivity to hyoscine butylbromide or any component of the formulation.
* Myasthenia gravis.
* Untreated narrow-angle glaucoma.
* Prostatic hypertrophy with urinary retention.
* Adynamic ileus.
* Tachyarrhythmias.
* Gastrointestinal obstruction or stenosis.
* Toxic megacolon.
## Adverse Effects
Common: Dry mouth, constipation, blurred vision, urinary retention, drowsiness, tachycardia.
Less Common: Dizziness, nausea, skin reactions. Serious: Severe allergic reactions, angle-closure glaucoma exacerbation, paralytic ileus.
## Key Drug Interactions
* **Anticholinergic agents (e.g., tricyclic antidepressants, antihistamines, some antipsychotics, other antispasmodics):** Additive anticholinergic effects, increasing the risk of side effects like dry mouth, blurred vision, urinary retention, and constipation.
* **Dopamine antagonists (e.g., metoclopramide):** May antagonize the effects of each other.
* **Beta-agonists and other sympathomimetics:** May increase heart rate.
## Monitoring
* Assess for relief of abdominal pain and spasms.
* Monitor for anticholinergic side effects, especially in the elderly or those with pre-existing conditions (e.g., dry mouth, blurred vision, constipation, urinary retention).
* Monitor heart rate, particularly with IV administration or in patients with cardiac history.
## Clinical Pearls
* Hyoscine butylbromide is a peripheral anticholinergic, meaning it has minimal effects on the central nervous system compared to centrally acting agents like atropine.
* It is primarily used for symptomatic relief of smooth muscle spasms in the GI tract.
* Onset of action for IV administration is rapid. Oral onset is slower.
* Ensure adequate hydration, especially if constipation occurs.
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*This information is intended for healthcare professionals. Always consult the most current prescribing information and local guidelines before making any clinical decisions. Dosing and recommendations may vary.*
