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# Hyoscine butylbromide
## Overview
Hyoscine butylbromide is an anticholinergic medication. It works by blocking muscarinic receptors on smooth muscle, leading to relaxation. It is poorly absorbed systemically when taken orally, with most effects being local within the gastrointestinal tract.
## Primary Indications
* Abdominal pain associated with smooth muscle spasms, such as irritable bowel syndrome (IBS) and diverticular disease.
* Biliary colic.
* Renal colic.
## Adult Dosing
* **Oral:** 20 mg orally up to four times daily.
* **Intramuscular/Intravenous:** 20 mg intramuscularly or intravenously, may be repeated every 6-8 hours as needed. Maximum dose is typically 100 mg per day, although specific institutional guidelines may vary.
## Pediatric Dosing
* **Oral:** Safety and efficacy in children under 12 years are not well established. Dosing is not routinely recommended.
* **Intramuscular/Intravenous:** Not recommended for use in children.
## Dose Adjustments
No specific dose adjustments are typically needed for hepatic or renal impairment due to poor systemic absorption.
## Contraindications
* Hypersensitivity to hyoscine butylbromide or any component of the formulation.
* Myasthenia gravis.
* Narrow-angle glaucoma.
* Paralytic ileus.
* Toxic megacolon.
* Tachyarrhythmias.
* Prostatic hypertrophy with urinary retention.
* Bowel obstruction.
## Adverse Effects
* Dry mouth.
* Blurred vision.
* Tachycardia.
* Urinary retention.
* Constipation.
* Drowsiness (less common with oral formulation).
* Difficulty with accommodation.
## Key Drug Interactions
* **Amantadine, quinidine, tricyclic antidepressants, MAO inhibitors, antihistamines, other anticholinergics:** Increased risk of anticholinergic side effects.
* **Metoclopramide, domperidone:** May antagonize the gastrointestinal effects of hyoscine butylbromide.
## Monitoring
* Monitor for relief of abdominal pain and spasms.
* Assess for anticholinergic side effects, particularly in elderly patients or those with pre-existing conditions (e.g., glaucoma, urinary retention).
## Clinical Pearls
* The oral formulation has limited systemic absorption, making it primarily useful for local effects within the GI tract.
* Parenteral administration leads to more rapid onset and can be used for more severe spasms or when oral administration is not feasible.
* Consider alternatives if symptoms persist or worsen.
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*Disclaimer: This information is intended for educational purposes only and does not constitute medical advice. Always refer to the latest official prescribing information and consult with a qualified healthcare professional for any medication-related questions or decisions. Dosing and indications may vary based on local protocols and individual patient circumstances.*
