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# Hyoscine butylbromide
## Overview
Hyoscine butylbromide is an anticholinergic medication that works by blocking muscarinic receptors, leading to smooth muscle relaxation. It is poorly absorbed systemically when taken orally, resulting in a localized effect on the gastrointestinal tract.
## Primary Indications
* Treatment of abdominal pain and cramping associated with irritable bowel syndrome (IBS).
* Relief of spasms of the gastrointestinal tract, biliary system, and urinary tract.
## Adult Dosing
* **Oral:** 10-20 mg three to five times daily. Maximum daily dose is typically 100 mg.
* **Parenteral (IM/IV):** 20 mg every 6 to 8 hours as needed. Maximum daily dose is typically 100 mg. Dosing for specific procedures (e.g., pre-procedural) may vary and should follow local protocol.
## Pediatric Dosing
* **Oral:** Generally not recommended for children under 6 years of age due to risk of anticholinergic side effects and difficulty in assessing symptoms. Dosing for children over 6 years is typically 10 mg three times daily.
* **Parenteral (IM/IV):** Use in children is generally discouraged due to limited data and potential for serious anticholinergic effects. If absolutely necessary, follow specific pediatric guidelines or consult a specialist.
## Dose Adjustments
No specific dose adjustments are typically required for renal or hepatic impairment due to its poor systemic absorption. However, caution is advised in elderly patients due to increased sensitivity to anticholinergic effects.
## Contraindications
* Hypersensitivity to hyoscine butylbromide or any component of the formulation.
* Myasthenia gravis.
* Narrow-angle glaucoma.
* Ileus or intestinal obstruction.
* Urinary retention.
* Tachyarrhythmias.
* Toxic megacolon.
* Prostatic hypertrophy with urinary retention.
## Adverse Effects
Common adverse effects include dry mouth, blurred vision, constipation, urinary retention, drowsiness, dizziness, tachycardia, and skin flushing. Serious anticholinergic toxicity is rare but can manifest as confusion, hallucinations, and CNS depression
