Absorption: Complete 1. Bioavailability:~45% Distribution 1. Vd:Females: 110 L; Males 140 L 2. Protein binding:14% Metabolism Via monoamine oxidase-A; forms metabolites; significant first-pass metabolismExcretion Urine (82%, 14% as unchanged drug); feces (12%)Pharmakodynamics 1. Half-life Elimination:2-3 hours
禁忌症
1. Hypersensitivity to rizatriptan or any component of the formulation 2. ischemic coronary artery disease (eg, angina pectoris, history of myocardial infarction, or documented silent ischemia) 3. significant cardiovascular disease; coronary artery vasospasm (including Prinzmetal angina); history of stroke or transient ischemic attack; peripheral vascular disease 4. ischemic bowel disease 5. uncontrolled hypertension 6. hemiplegic migraine or migraine with brainstem aura 7. during or within 2 weeks of monoamine oxidase inhibitor use; during or within 24 hours of treatment with another 5-HT1 agonist, or an ergotamine-containing or ergot-type medication (eg, methysergide, dihydroergotamine)
懷孕分類
Until additional information is available, other agents are preferred for the initial treatment of migraine in pregnancy
哺乳分類
It is not known if rizatriptan is present in breast milk.
Migraine, moderate to severe, acute treatment: 5 to 10 mg as a single dose; if symptoms persist or return, may repeat dose after ≥2 hours. The manufacturer’s labeling recommends a maximum daily dose of 30 mg per 24 hours; however, some experts recommend a maximum of 20 mg per 24 hours; efficacy data are not available for doses exceeding 20 mg in a 24-hour period
小兒調整劑量
Migraine, acute treatment: Children ≥ 6 years and Adolescents: Oral: <40 kg: 5 mg as a single dose. ≥40 kg: 10 mg as a single dose. Note: Safety and efficacy of multiple rizatriptan doses in a 24-hour period has not been established for pediatric patients.
腎功能調整劑量
There are no dosage adjustments provided in the manufacturer's labeling; however, the AUC was 44% greater in patients on hemodialysis.
肝功能調整劑量
There are no dosage adjustments provided in the manufacturer's labeling; however, plasma concentrations are increased by 30% in patients with moderate hepatic dysfunction.