Hyoscine Butylbromide

# Hyoscine butylbromide ## Overview - **Classification**: Antispasmodic, Antimuscarinic/Anticholinergic. - **Mechanism**: Blocks acetylcholine at muscarinic receptors in GI, biliary, and genitourinary smooth muscle, reducing spasm and pain. Does not readily cross the blood-brain barrier. ## Primary Indications 1. **Gastrointestinal Spasm**: Relief of spasm in IBS, biliary colic, renal colic. 2. **Endoscopic Procedures**: To reduce GI motility during diagnostic procedures (e.g., endoscopy). 3. **Dysmenorrhea**: Symptomatic relief of period pain. ## Adult Dosing ### Standard Dosing **Gastrointestinal/Genitourinary Spasm (Oral)** - **Dose**: **10-20 mg** - **Frequency**: Three to five times daily - **Route**: Oral - **Duration**: As needed, up to 72 hours for self-medication. **Gastrointestinal/Genitourinary Spasm (Parenteral - Acute)** - **Dose**: **20 mg** - **Frequency**: May be repeated after 30 minutes if needed - **Route**: Intramuscular (IM) or Intravenous (IV) - **Maximum**: **100 mg** per day **Endoscopic Procedures** - **Dose**: **20 mg** - **Frequency**: Single dose prior to procedure - **Route**: Intravenous (IV) slowly over 1-2 minutes ### Dose Adjustments - **Renal Impairment**: No specific dose adjustments. Use with caution in severe impairment. - **Hepatic Impairment**: No specific dose adjustments. Use with caution in severe impairment. - **Elderly Patients**: No specific dose adjustment. Use with caution due to increased anticholinergic sensitivity. ## Pediatric Dosing ### Neonates (0-28 days) - **Dose**: Not recommended. - **Special Notes**: Safety and efficacy not established. High risk of anticholinergic side effects. ### Infants (1-12 months) - **Dose**: Not recommended. - **Special Notes**: Safety and efficacy not established. Increased sensitivity to anticholinergic effects. ### Children (1-12 years) **Acute Spasm (Parenteral)** - **Dose**: **0.3-0.6 mg/kg/dose** - **Frequency**: May be repeated after 30 minutes if needed. - **Route**: Intramuscular (IM) or Intravenous (IV) slowly. - **Maximum**: **20 mg** per dose. - **Special Notes**: Administer IV slowly. Use only for severe spasm under physician supervision. **Gastrointestinal Spasm (Oral) - for ages 6-12 years** - **Dose**: **10 mg** - **Frequency**: Three times daily - **Maximum**: **30 mg** per day. - **Special Notes**: Use only as directed by a physician. Not for self-medication. ### Adolescents (13-18 years) **Acute Spasm (Parenteral)** - **Dose**: **20 mg** - **Frequency**: May be repeated after 30 minutes if needed. - **Route**: IM or IV slowly. - **Maximum**: **100 mg** per day. **Gastrointestinal Spasm (Oral)** - **Dose**: **10-20 mg** - **Frequency**: Three to five times daily. - **Maximum**: **100 mg** per day. - **Special Notes**: Approach adult dosing. ## Safety Information ### Contraindications - **Absolute**: Myasthenia gravis, megacolon, paralytic or obstructive ileus. - **Absolute**: Narrow-angle glaucoma. - **Absolute**: Urinary retention (e.g., prostatic hypertrophy). - **Absolute**: Tachyarrhythmia. - **Absolute**: Hypersensitivity to hyoscine butylbromide. ### Common Adverse Effects - **Very Common (>10%)**: Dry mouth. - **Common (1-10%)**: Tachycardia, dizziness, blurred vision, accommodation disorder, constipation. - **Serious but Rare**: Anaphylaxis, severe skin reactions, urinary retention, paradoxical excitement. ### Key Drug Interactions - **Tricyclic Antidepressants, Antihistamines**: Increased anticholinergic effects. - **Dopamine Antagonists (e.g., metoclopramide)**: Reduced GI motility effects of both drugs. - **Beta-agonists**: May enhance the tachycardic effect of beta-agonists. ## Monitoring & Follow-up - **Before Treatment**: Assess for contraindications (glaucoma, urinary retention, bowel obstruction). - **During Treatment**: Monitor for urinary retention, blurred vision, severe constipation. - **Clinical Signs**: Watch for severe abdominal pain, fever, vomiting, bloody stools (may indicate a serious underlying condition). ## Clinical Pearls - 💡 **Tip 1**: Administer IV doses slowly (over 1-2 minutes) to minimize cardiac effects. - 💡 **Tip 2**: Advise patients about common anticholinergic effects like dry mouth and blurred vision. - 💡 **Tip 3**: Not for long-term use; investigate underlying causes of chronic abdominal pain. - 💡 **Tip 4**: Not effective for all types of pain; specifically targets smooth muscle spasm. > **⚠️ Important**: This information is for educational purposes only. Always consult current prescribing information, local guidelines, and clinical judgment before prescribing.