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# Hyoscine butylbromide (Buscopan)
## Overview
Hyoscine butylbromide is an antispasmodic agent that works by blocking muscarinic receptors in the smooth muscle of the gastrointestinal tract. This reduces spasms and colic. It is poorly absorbed from the GI tract, leading to minimal systemic effects when given orally. However, parenteral administration leads to greater systemic absorption and potential anticholinergic side effects.
## Primary Indications
* Symptomatic relief of abdominal pain and cramping associated with gastrointestinal spasms.
## Adult Dosing
* **Oral:** 10 mg to 20 mg three to four times daily.
* **Intramuscular/Intravenous:** 20 mg every 4 to 6 hours as needed. Maximum daily dose: 100 mg.
## Pediatric Dosing
* **Oral:**
* Children 6 to 12 years: 10 mg three times daily.
* Children over 12 years: 10 mg to 20 mg three to four times daily. (Dosing for younger children is not well established and should be guided by clinical judgment.)
* **Intramuscular/Intravenous:** Dosing not well established in children. Use with caution and lower doses may be considered under strict medical supervision.
## Dose Adjustments
No specific dose adjustments are typically required for hepatic or renal impairment due to poor oral absorption and limited systemic accumulation. However, caution is advised with parenteral administration in these populations.
## Contraindications
* Hypersensitivity to hyoscine butylbromide or any component of the formulation.
* Myasthenia gravis.
* Gastrointestinal obstruction or ileus.
* Tachyarrhythmias.
* Narrow-angle glaucoma.
* Prostatic hypertrophy with urinary retention.
* Megacolon.
## Adverse Effects
Common anticholinergic effects may occur, especially with parenteral administration:
* Dry mouth
* Blurred vision
* Tachycardia
* Constipation
* Urinary retention
* Drowsiness
* Skin reactions (rare)
## Key Drug Interactions
* **Anticholinergic agents (e.g., tricyclic antidepressants, antihistamines, amantadine):** Increased risk of anticholinergic side effects.
* **Dopamine antagonists (e.g., metoclopramide):** May reduce the efficacy of both drugs.
* **Beta-agonists:** May potentially increase heart rate.
## Monitoring
* Monitor for relief of abdominal symptoms.
* Monitor for adverse effects, particularly anticholinergic effects, especially with parenteral administration.
## Clinical Pearls
* Oral administration generally has a good safety profile due to poor systemic absorption.
* Parenteral administration should be used judiciously due to the potential for systemic anticholinergic adverse effects.
* In severe cases of abdominal colic, parenteral route may be preferred for faster onset of action.
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**Disclaimer:** This information is intended for healthcare professionals. It is essential to consult the most current prescribing information and local guidelines before initiating treatment. Dosing and recommendations may vary.
