Hayosin

# Hayosin ## Overview - **Classification**: Anticholinergic, Antispasmodic - **Mechanism**: Blocks muscarinic acetylcholine receptors, relaxing smooth muscle in the gastrointestinal, urinary, and biliary tracts. ## Primary Indications 1. **Abdominal Cramps** - Acute relief of spasmodic pain 2. **Irritable Bowel Syndrome (IBS)** - Management of painful bowel spasms 3. **Renal/Biliary Colic** - Adjunct for acute pain relief ## Adult Dosing ### Standard Dosing **Abdominal Cramps / IBS** - **Dose**: **10-20 mg** - **Frequency**: Every 4-6 hours as needed - **Route**: Oral (Tablet) - **Maximum**: **80 mg** per 24 hours **Acute Spasms (Renal/Biliary Colic)** - **Dose**: **20 mg** - **Frequency**: Single dose, may repeat after 30 minutes if needed - **Route**: Intravenous (IV) or Intramuscular (IM) - **Maximum**: **60 mg** per 24 hours (IV/IM) ### Dose Adjustments - **Renal Impairment**: Use with caution. No specific dose adjustment but monitor for increased anticholinergic effects in severe impairment. - **Hepatic Impairment**: Use with caution. No specific dose adjustment but monitor for increased anticholinergic effects in severe impairment. - **Elderly Patients**: Start with lower doses (e.g., **10 mg** orally) due to increased sensitivity to anticholinergic effects (e.g., confusion, urinary retention). ## Pediatric Dosing ### Neonates (0-28 days) - **Dose**: Not recommended. - **Special Notes**: Anticholinergics carry higher risks in neonates, including paralytic ileus and CNS effects. ### Infants (1-12 months) - **Dose**: **0.1-0.2 mg/kg** - **Frequency**: Every 6-8 hours as needed - **Route**: Oral solution or suppository formulation - **Maximum**: **5 mg** per dose or **20 mg** per 24 hours - **Special Notes**: Monitor closely for signs of anticholinergic toxicity (e.g., flushed skin, fever, dilated pupils). ### Children (1-12 years) - **Dose**: **0.2-0.4 mg/kg** - **Frequency**: Every 6-8 hours as needed - **Route**: Oral solution, tablet, or suppository - **Maximum**: **20 mg** per dose or **80 mg** per 24 hours ### Adolescents (13-18 years) - **Dose**: Adult dosing recommended. - **Maximum**: **80 mg** per 24 hours (Oral); **60 mg** per 24 hours (IV/IM) ## Safety Information ### Contraindications - **Absolute**: Angle-closure glaucoma (untreated) - **Absolute**: Prostatic hypertrophy with urinary retention - **Absolute**: Mechanical stenoses of GI tract (e.g., pyloric stenosis, paralytic ileus) - **Absolute**: Tachyarrhythmia - **Absolute**: Myasthenia gravis - **Relative**: Severe ulcerative colitis (may precipitate toxic megacolon) ### Common Adverse Effects - **Very Common (>10%)**: Dry mouth, blurred vision - **Common (1-10%)**: Dizziness, constipation, urinary retention, tachycardia, skin flushing - **Serious but Rare**: Acute angle-closure glaucoma, paradoxical excitement, anaphylaxis ### Key Drug Interactions - **Other Anticholinergics (e.g., TCAs, Antihistamines, MAOIs)**: Increased risk of anticholinergic adverse effects (dry mouth, urinary retention). - **Opioid Analgesics**: May exacerbate constipation and increase risk of paralytic ileus. Monitor bowel function. - **Dopamine Antagonists (e.g., Metoclopramide)**: Hayosin may reduce effects of prokinetic agents. Avoid concomitant use. ## Monitoring & Follow-up - **Before Treatment**: Assess for pre-existing conditions like glaucoma or prostatic hypertrophy. - **During Treatment**: Monitor for urinary retention (especially in elderly males), severe constipation. - **Clinical Signs**: Advise patients to report blurred vision, eye pain, persistent constipation, or difficulty urinating. ## Clinical Pearls - 💡 **Tip 1**: Administer Hayosin **30-60 minutes before meals** if spasms are associated with eating. - 💡 **Tip 2**: For rapid relief of acute spasms, **IV/IM route** provides faster onset compared to oral. - 💡 **Tip 3**: Counsel patients on common anticholinergic effects like dry mouth (suck on hard candy, sips of water) and blurred vision (avoid driving/operating machinery until effects known). > **⚠️ Important**: This information is for educational purposes only. Always consult current prescribing information, local guidelines, and clinical judgment before prescribing.