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# Hyoscine butylbromide
## Overview
Hyoscine butylbromide is an anticholinergic medication that works by blocking muscarinic receptors, leading to smooth muscle relaxation in the gastrointestinal and genitourinary tracts.
## Primary Indications
* Cramps and spasms of the gastrointestinal tract (e.g., irritable bowel syndrome).
* Biliary colic.
* Renal colic.
* Dysmenorrhea.
## Adult Dosing
* **Oral:** 10-20 mg three to five times daily. Maximum daily dose is typically 100 mg.
* **Intramuscular/Intravenous:** 20 mg every 4-6 hours as needed. Maximum daily dose is typically 100 mg. Dosing for specific procedures may vary and should adhere to local protocols.
## Pediatric Dosing
* **Oral:**
* Children 6-12 years: 10 mg two to three times daily.
* Children over 12 years: 10-20 mg three to five times daily.
* **Intramuscular/Intravenous:**
* Children 6-12 years: 10 mg two to three times daily.
* Data for younger children is limited. Use with caution and consider local protocols.
## Dose Adjustments
No specific dose adjustments are typically required for renal or hepatic impairment, but caution is advised due to potential accumulation.
## Contraindications
* Hypersensitivity to hyoscine butylbromide or any excipients.
* Glaucoma (angle-closure).
* Myasthenia gravis.
* Megaloblastic anemia (with vitamin B12 deficiency).
* Tachyarrhythmias.
* Paralytic ileus.
* Severe ulcerative colitis or toxic megacolon.
* Prostatic hypertrophy with urinary retention.
* Certain cardiac conditions; consult specific product information.
## Adverse Effects
Common: Dry mouth, blurred vision, constipation, tachycardia, urinary retention, sweating reduction.
Less Common: Drowsiness, dizziness, skin rash, difficulty breathing. Severe allergic reactions are rare.
## Key Drug Interactions
* **Amines:** May decrease the absorption of oral drugs depending on gastric pH and motility.
* **Anticholinergics:** Additive anticholinergic effects (e.g., with other anticholinergic agents, some antidepressants, antihistamines).
* **Dopamine antagonists:** May reduce the efficacy of prokinetic drugs (e.g., metoclopramide).
* **Potassium supplements:** Delayed-release potassium may have increased risk of gastrointestinal ulceration if transit is slowed.
## Monitoring
* Monitor for signs of anticholinergic side effects (dry mouth, blurred vision, urinary retention, constipation, tachycardia).
* Assess symptom relief.
## Clinical Pearls
* Hyoscine butylbromide is a peripheral anticholinergic and generally does not cross the blood-brain barrier significantly, thus having fewer central nervous system side effects compared to centrally acting anticholinergics like scopolamine.
* Intravenous administration can provide rapid relief of acute spasms.
* Ensure adequate hydration and consider stool softeners for patients prone to constipation.
**Disclaimer:** This information is intended for healthcare professionals. Always consult the most current prescribing information and local institutional guidelines before prescribing.
