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# Hyoscine butylbromide (Buscopan)
## Overview
Hyoscine butylbromide is an anticholinergic antispasmodic agent. It works by blocking muscarinic receptors in the smooth muscle of the gastrointestinal tract, leading to relaxation and relief of spasms.
## Primary Indications
* Symptomatic relief of abdominal pain and cramps associated with gastrointestinal spasms.
* Available in some regions for irritable bowel syndrome (IBS) symptoms.
* Historically used for peptic ulcer disease, but less common now due to better alternatives.
## 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 oral dose is generally 100 mg. Maximum parenteral dose is generally 100 mg/day.
## Pediatric Dosing
* **Oral:** Dosing in children under 12 years of age is not well-established. Some sources suggest 10 mg three times daily for children aged 6-12 years, but caution is advised.
* **Parenteral:** Not recommended for routine use in children under 12 years.
## Dose Adjustments
No specific dose adjustments are typically required for renal or hepatic impairment, as the drug has low systemic absorption and undergoes hydrolysis in the liver and intestines.
## Contraindications
* Hypersensitivity to hyoscine butylbromide, atropine, or other anticholinergics.
* Myasthenia gravis.
* Narrow-angle glaucoma.
* Prostatic hypertrophy with urinary retention.
* Tachyarrhythmias.
* Paralytic ileus or intestinal obstruction.
* Toxic megacolon.
* Patients with a colostomy or ileostomy due to risk of exacerbating symptoms.
## Adverse Effects
Common anticholinergic side effects may occur, including:
* Dry mouth
* Blurred vision
* Tachycardia
* Constipation
* Urinary retention
* Drowsiness (less common with butylbromide than other anticholinergics)
* Skin reactions (rare)
## Key Drug Interactions
* **Anticholinergic agents:** Additive effects with other drugs having anticholinergic properties (e.g., tricyclic antidepressants, antihistamines, other antispasmodics), increasing the risk of side effects.
* **Dopamine antagonists:** May reduce the effects of metoclopramide and domperidone.
* **Beta-blockers:** May increase the risk of tachycardia.
## Monitoring
* Monitor for improvement in abdominal pain and spasms.
* Assess for anticholinergic side effects, particularly in elderly patients or those with comorbidities.
## Clinical Pearls
* Hyoscine butylbromide has a quaternary ammonium structure, which limits its ability to cross the blood-brain barrier, resulting in fewer central nervous system effects compared to other anticholinergics like atropine.
* Onset of action for oral formulations is typically within 30-60 minutes. Parenteral administration provides a more rapid onset.
* Ensure patient is not experiencing a more serious underlying condition that requires different management.
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**Disclaimer:** This information is intended for healthcare professionals and does not replace the need to consult the most current prescribing information and clinical guidelines. Always verify drug information with reliable, up-to-date resources before making any clinical decisions.
