Hyoscine%2520butylbromide

# Hyoscine butylbromide ## Overview - Anticholinergic/antimuscarinic agent; peripherally acting spasmolytic. - Does not cross the blood-brain barrier significantly; minimal central anticholinergic effects at usual doses. - Also known as scopolamine butylbromide; brand names: Buscopan, Buscolysin. ## Primary Indications - Symptomatic relief of gastrointestinal tract spasm (e.g., irritable bowel syndrome, biliary colic). - Renal colic (adjunct). - Functional dysmenorrhea (off-label in some regions). ## Adult Dosing - **Oral**: 10–20 mg three to five times daily. Maximum: 100 mg/day. - **IM/IV (slow)**: 20–40 mg; may repeat after 30 minutes if needed. Maximum: 100 mg/day. - Dosing exact per local protocol may vary; follow approved national guidelines. ## Pediatric Dosing - Limited data; use predominantly based on local protocol. - **Oral (suspension/tablets)**: >6 years: 10 mg three times daily. Maximum: 60 mg/day. - **IV/IM**: Not routinely recommended without specialist guidance; only if benefit outweighs risk. Avoid in neonates/infants due to injection risk. ## Dose Adjustments - **Renal/hepatic impairment**: No established dose adjustment; caution in severe impairment (limited data). - **Elderly**: Increased risk of anticholinergic side effects (constipation, urinary retention); start at lower dose. ## Contraindications - Hypersensitivity to hyoscine or anticholinergics. - Myasthenia gravis. - Narrow-angle glaucoma. - Mechanical gastrointestinal obstruction (e.g., ileus) or severe ulcerative colitis. - Acute urinary retention (prostatic hypertrophy). - Tachycardia, megacolon. ## Adverse Effects - **Common**: Dry mouth, blurred vision, dizziness, constipation, urinary retention, tachycardia. - **Serious (rare)**: Anaphylaxis, acute angle-closure glaucoma, paralytic ileus (high dose or prolonged use). ## Key Drug Interactions - **Anticholinergics** (e.g., tricyclic antidepressants, antihistamines, antispasmodics): additive anticholinergic effects. - **Dopamine antagonists** (e.g., metoclopramide): antagonism of GI motility effect. - **β-adrenergic agonists**: risk of tachycardia. ## Monitoring - Clinical response (pain relief, spasm resolution). - Anticholinergic side effects, especially in elderly or those with renal impairment. ## Clinical Pearls - **IV injection**: Administer slowly (over 1–2 minutes) to avoid paradoxical bradycardia/hypotension. - **Not for daily IBS maintenance**: Use short-term for acute spasms; long-term use lacks strong evidence. - **Loperamide** can be used concurrently if diarrhea present; caution for constipation. - **Pregnancy**: Avoid first trimester (limited safety data); breastfeeding: minimal excretion, generally acceptable. --- *This information is for educational purposes only. Always verify current prescribing information from the manufacturer’s summary of product characteristics and local clinical guidelines before initiating therapy.*