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# Hyoscine butylbromide (Buscopan)
## Overview
Hyoscine butylbromide is an anticholinergic medication that works by blocking muscarinic receptors, leading to smooth muscle relaxation. It is primarily used for its antispasmodic effects on the gastrointestinal and genitourinary tracts.
## Primary Indications
* Symptomatic relief of abdominal cramps and spasms.
* Relief of spasms of the bladder and ureters.
* Pre-operative medication to reduce secretions and prevent laryngospasm.
## Adult Dosing
* **Oral:** 20 mg (two 10 mg tablets) up to 4 times daily.
* **Intramuscular (IM) or Intravenous (IV):** 20 mg every 6-8 hours as needed.
* **Maximum recommended daily dose:** 100 mg orally or 100 mg parenterally. Dosing may vary based on local hospital protocols, especially for parenteral administration.
## Pediatric Dosing
* **Oral:** Dosing in children under 12 years is not well-established. Use with caution. Some sources suggest 5-10 mg 2-3 times daily for children aged 6-12 years, but this requires further validation.
* **IM or IV:** Dosing in children is not routinely recommended due to lack of data and potential for adverse effects.
## Dose Adjustments
No specific dose adjustments are typically required for renal or hepatic impairment. However, caution should be exercised in elderly patients who may be more susceptible to anticholinergic adverse effects.
## Contraindications
* Hypersensitivity to hyoscine butylbromide or any component of the formulation.
* Myasthenia gravis.
* Glaucoma (especially angle-closure glaucoma).
* Megalocolon.
* Ileus or intestinal obstruction.
* Tachyarrhythmias.
* Prostatic hypertrophy with urinary retention.
* Infants under 3 months of age or weighing less than 6 kg due to increased risk of adverse effects.
## Adverse Effects
Common adverse effects include dry mouth, blurred vision, tachycardia, constipation, and urinary retention. Less common effects include skin reactions, dizziness, and drowsiness. Severe reactions are rare.
## Key Drug Interactions
* **Amantadine, quinidine, tricyclic antidepressants, MAO inhibitors:** Increased anticholinergic effects.
* **Antipsychotics:** May reduce efficacy and increase risk of adverse effects like tardive dyskinesia.
* **Dopamine antagonists (e.g., metoclopramide):** May reduce the efficacy of both drugs.
* **Beta-blockers:** May increase heart rate.
## Monitoring
* Monitor for signs of anticholinergic adverse effects (dry mouth, blurred vision, urinary retention, constipation, tachycardia).
* Assess effectiveness in relieving spasms and pain.
* Monitor urinary output, especially in at-risk patients.
## Clinical Pearls
* Parenteral administration can provide rapid relief of severe spasms.
* Ensure adequate hydration when used long-term, especially if constipation is a concern.
* Avoid concurrent use with other anticholinergic medications unless specifically indicated.
* The risk of adverse effects increases with higher doses and in susceptible populations (elderly, children).
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*Disclaimer: This information is intended for clinical professionals and does not replace product-specific prescribing information or professional judgment. Always verify current dosing, indications, contraindications, and safety information with the latest official product labeling and local guidelines.*
