Tab Rizatriptan

# Tab Rizatriptan ## Overview - **Classification**: Selective 5-hydroxytryptamine1B/1D (5-HT1B/1D) receptor agonist (Triptan). - **Mechanism**: Causes selective vasoconstriction of intracranial blood vessels and inhibits pro-inflammatory neuropeptide release, reducing migraine pain. ## Primary Indications 1. **Acute Migraine Treatment** - With or without aura in adults. 2. **Acute Migraine Treatment** - With or without aura in children and adolescents (6-17 years). ## Adult Dosing ### Standard Dosing **Acute Migraine Treatment** - **Dose**: **5 mg** or **10 mg** - **Frequency**: Once at onset of migraine headache. May repeat once after **2 hours** if headache recurs. - **Route**: Oral (tablet or orally disintegrating tablet [ODT]) - **Maximum Dose**: **30 mg** in any 24-hour period. - **Special Considerations**: ODT can be taken without liquid. ### Dose Adjustments - **Propranolol Co-administration**: If taking propranolol, **start with 5 mg**. Maximum total dose is **15 mg** in 24 hours. - **Renal Impairment**: No specific adjustment for mild-moderate; use with caution in severe impairment. - **Hepatic Impairment**: No specific adjustment for mild-moderate; use with caution in severe impairment. - **Elderly Patients (>65 years)**: Use with caution due to higher risk of cardiovascular events; consider lower initial dose. ## Pediatric Dosing ### Neonates (0-28 days) - **Special Notes**: Not recommended. Safety and efficacy not established. ### Infants (1-12 months) - **Special Notes**: Not recommended. Safety and efficacy not established. ### Children (1-5 years) - **Special Notes**: Not recommended. Safety and efficacy not established. Rizatriptan is approved from 6 years of age. ### Children (6-11 years) **Acute Migraine Treatment** - **Weight < 40 kg**: **5 mg** - **Weight ≥ 40 kg**: **10 mg** - **Frequency**: Once at onset of migraine headache. May repeat once after **2 hours** if headache recurs. - **Route**: Oral (tablet or ODT) - **Maximum Dose**: - < 40 kg: **10 mg** in 24 hours. - ≥ 40 kg: **20 mg** in 24 hours. - **Special Notes**: Administer as soon as possible after onset of attack. ### Adolescents (12-17 years) **Acute Migraine Treatment** - **Dose**: **10 mg** - **Frequency**: Once at onset of migraine headache. May repeat once after **2 hours** if headache recurs. - **Route**: Oral (tablet or ODT) - **Maximum Dose**: **20 mg** in 24 hours. - **Special Notes**: Similar to adult dosing, but with a lower maximum dose. ## Safety Information ### Contraindications - **Absolute**: Ischemic heart disease, coronary artery vasospasm (Prinzmetal's angina). - **Absolute**: Cerebrovascular syndromes (stroke, TIA), peripheral vascular disease. - **Absolute**: Uncontrolled hypertension. - **Absolute**: Hemiplegic or basilar migraine. - **Absolute**: Concurrent use or within 2 weeks of MAOIs. - **Absolute**: Within 24 hours of another triptan or ergotamine-type medication. - **Absolute**: Hypersensitivity to rizatriptan. ### Common Adverse Effects - **Very Common (>10%)**: Asthenia/fatigue, dizziness, somnolence. - **Common (1-10%)**: Nausea, dry mouth, paresthesia, headache, chest pain/tightness (non-cardiac). - **Serious but Rare**: Myocardial infarction, stroke, arrhythmias, serotonin syndrome, vasospasm. ### Key Drug Interactions - **MAOIs**: Contraindicated due to increased risk of serotonin syndrome. - **Propranolol**: Increases rizatriptan plasma levels; dose adjustment needed (max **15 mg/24h**). - **SSRIs/SNRIs**: Increased risk of serotonin syndrome; monitor closely. - **Other Triptans/Ergotamines**: Contraindicated within 24 hours due to additive vasospastic effects. ## Monitoring & Follow-up - **Before Treatment**: Assess for cardiovascular risk factors, uncontrolled hypertension. - **During Treatment**: Monitor for chest pain, signs of serotonin syndrome, blood pressure (if known hypertension). - **Clinical Signs**: Watch for dizziness, tingling, numbness, chest/jaw/neck tightness (differentiate from cardiac pain). ## Clinical Pearls - 💡 **Timely Use**: Take at the first sign of migraine headache for best efficacy. - 💡 **Not for Prevention**: Rizatriptan is for acute migraine treatment, not prevention. - 💡 **ODT Convenience**: Orally disintegrating tablets can be taken without water, useful for nausea or on-the-go. - 💡 **Chest Symptoms**: Counsel patients that mild chest/neck/jaw tightness is common but typically non-cardiac. Seek immediate medical attention for severe or persistent pain. > **⚠️ Important**: This information is for educational purposes only. Always consult current prescribing information, local guidelines, and clinical judgment before prescribing.