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# Hyoscine butylbromide (Buscopan)
## Overview
Hyoscine butylbromide is an anticholinergic medication that acts as a smooth muscle relaxant, primarily affecting the gastrointestinal and genitourinary tracts. It works by blocking muscarinic receptors, reducing parasympathetic stimulation.
## Primary Indications
* Treatment of abdominal pain and cramping associated with gastrointestinal spasms.
* Relief of spasmodic pain in conditions such as irritable bowel syndrome (IBS).
* Premedication in surgery to reduce secretions and prevent laryngospasm.
## Adult Dosing
* **Oral:** 10-20 mg up to four times daily.
* **Intramuscular (IM) or Intravenous (IV):** 20 mg every 6-8 hours as needed. Maximum daily dose is typically 100 mg.
* **Suppositories (Rectal):** 10-20 mg up to four times daily.
## Pediatric Dosing
Dosing in children is not well-established and should be approached with caution. Local protocols may vary.
* **Oral:** Some sources suggest doses around 0.3-1 mg/kg per dose, not exceeding adult doses, for children over 6 years of age. This requires careful consideration of the child's weight.
* **IM/IV:** Generally not recommended for children. If used, doses are significantly lower than adult doses and require strict medical supervision.
## Dose Adjustments
* **Renal Impairment:** No specific dose adjustments are routinely recommended for mild to moderate renal impairment. However, caution is advised as renal excretion is a minor elimination pathway.
* **Hepatic Impairment:** No specific dose adjustments are routinely recommended.
## Contraindications
* Hypersensitivity to hyoscine butylbromide or any component of the formulation.
* Myasthenia gravis.
* Glaucoma (angle-closure glaucoma).
* Tachyarrhythmias.
* Mega colon or intestinal atony.
* Prostatic hypertrophy with urinary retention.
* Ileus or bowel obstruction.
## Adverse Effects
Common adverse effects are anticholinergic in nature and include: dry mouth, blurred vision, constipation, urinary retention, tachycardia, drowsiness, and dizziness. Less common include fever, confusion, and difficulty breathing.
## Key Drug Interactions
* **Anticholinergic agents:** Additive effects can increase the risk of anticholinergic toxicity (e.g., tricyclic antidepressants, antihistamines, antipsychotics).
* **Prokinetic agents:** Hyoscine butylbromide may antagonize the effects of prokinetic drugs (e.g., metoclopramide).
* **Beta-agonists:** May increase heart rate.
## Monitoring
* Monitor for signs of anticholinergic side effects, especially in elderly patients or those with impaired renal/hepatic function.
* Assess for effectiveness in relieving abdominal spasms.
* Monitor heart rate with IV administration.
## Clinical Pearls
* Hyoscine butylbromide is a peripheral anticholinergic; central nervous system effects are less common than with centrally acting anticholinergics like scopolamine (hyoscine hydrobromide).
* It is useful for symptomatic relief of smooth muscle spasm.
* IV administration provides rapid onset of action.
* Use cautiously in patients prone to glaucoma, urinary retention, or constipation.
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*Disclaimer: This information is intended for healthcare professionals and does not replace professional medical advice. Always consult the most current prescribing information and patient-specific factors before initiating treatment.*
