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# Hyoscine Butylbromide (Buscopan)
## Overview
Hyoscine butylbromide is a quaternary ammonium antispasmodic agent. Unlike hyoscine hydrobromide, it does not cross the blood-brain barrier and therefore lacks central nervous system (CNS) effects. It acts as a peripheral muscarinic receptor antagonist to relieve smooth muscle spasms in the gastrointestinal, biliary, and urinary tracts.
## Primary Indications
* Abdominal pain/cramping (e.g., irritable bowel syndrome, biliary colic).
* Gastrointestinal tract spasms.
* Adjunct in diagnostic procedures (e.g., radiology of the GI tract).
* *Note:* Use for renal colic is less effective than NSAIDs, though often utilized as an adjunct.
## Adult Dosing
* **Oral:** 10–20 mg three to four times daily. Maximum dose: 100 mg/day.
* **Intramuscular/Intravenous/Subcutaneous:** 20 mg as a single dose. May be repeated after 30 minutes if necessary. Maximum dose: 100 mg/day.
## Pediatric Dosing
*Dosing varies by local protocol; consultation with a pediatric formulary is recommended.*
* **Children 6–12 years:** 10 mg orally three times daily.
* **Parenteral:** Generally 0.3–0.6 mg/kg/dose, up to 20 mg, administered by slow injection.
## Dose Adjustments
* **Renal/Hepatic Impairment:** No formal standardized dosing adjustments exist; however, use with caution due to accumulation risk; lower doses or increased interval may be required in severe impairment.
* **Elderly:** Use lower starting doses; monitor closely for urinary retention and tachycardia.
## Contraindications
* Known hypersensitivity to hyoscine butylbromide.
* Myasthenia gravis.
* Megacolon.
* Mechanical intestinal obstruction or paralytic ileus.
* Narrow-angle glaucoma.
* Tachycardia/tachyarrhythmias.
* Prostatic hypertrophy with urinary retention.
## Adverse Effects
* **Common:** Dry mouth, tachycardia, blurred vision (mydriasis), dizziness, and constipation.
* **Serious:** Anaphylaxis (rare), urinary retention, and angle-closure glaucoma (triggered in susceptible individuals).
## Key Drug Interactions
* **Anticholinergics:** Additive effects increase the risk of dry mouth, urinary retention, and confusion (e.g., TCAs, antihistamines, antipsychotics).
* **Metoclopramide/Domperidone:** Antagonistic effect; hyoscine butylbromide may decrease the efficacy of prokinetic agents on the GI tract.
## Monitoring
* Monitor heart rate (tachycardia).
* Monitor for signs of urinary retention, especially in patients with BPH.
* Monitor for visual disturbances or acute eye pain.
## Clinical Pearls
* **CNS profile:** Its quaternary ammonium structure prevents CNS penetration, making it safer than other antispasmodics regarding sedation or cognitive impairment.
* **Parenteral Administration:** If administered intravenously, inject slowly to avoid transient tachycardia or hypotension.
* **Self-limiting Conditions:** It is intended for symptomatic relief; if pain persists or if there are "red flags" (e.g., blood in stool, fever, weight loss), prompt clinical evaluation is required to rule out serious pathology.
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*Disclaimer: This information is for educational purposes only. Drug dosing, contraindications, and availability can vary significantly by country and local hospital protocol. Always verify current prescribing information through official pharmacy databases or institutional guidelines before prescribing or administering medication.*
