Maropitant (Cerenia) is a novel, selective neurokinin type-1 (NK1) receptor antagonist developed to treat and prevent emesis in dogs; it is administered by subcutaneous (s.c.) injection at 1 mg/kg, or orally (p.o.), in tablet form, at either 2 or 8 mg/kg depending on indication. The absolute bioavailability of maropitant was markedly higher (90.7%) following s.c. injection than after oral administration (23.7% at the 2 mg/kg dose and 37.0% at the 8 mg/kg dose). First-pass metabolism contributes to the low bioavailability of maropitant following oral administration. The difference in bioavailability between the two oral doses reflects the nonlinear kinetics characterizing the disposition of maropitant within the 2-8 mg/kg dose range. Systemic clearance of maropitant following intravenous (i.v.) administration was 970, 995 and 533 mL/h.kg at doses of 1, 2 and 8 mg/kg, respectively. Nonproportional kinetics were observed for p.o. administered maropitant at doses ranging from 2 to 16 mg/kg but dose proportionality was demonstrated at higher doses (20-50 mg/kg).
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|Animal A (mg/kg) = Animal B (mg/kg) multiplied by||Animal B Km|
|Animal A Km|
For example, to modify the dose of resveratrol used for a mouse (22.4 mg/kg) to a dose based on the BSA for a rat, multiply 22.4 mg/kg by the Km factor for a mouse and then divide by the Km factor for a rat. This calculation results in a rat equivalent dose for resveratrol of 11.2 mg/kg.
Effect of maropitant, a neurokinin 1 receptor antagonist, on anesthetic requirements during noxious visceral stimulation of the ovary in dogs.
Boscan et al. Am J Vet Res. 2011 Dec;72(12):1576-9. PMID: 22126683.
Effect of epidural and intravenous use of the neurokinin-1 (NK-1) receptor antagonist maropitant on the sevoflurane minimum alveolar concentration (MAC) in dogs.
Alvillar et al. Vet Anaesth Analg. 2012 Mar;39(2):201-5. PMID: 22103569.
The use of maropitant to prevent vomiting induced by epidural administration of preservative free morphine through an epidural catheter in a dog.
Mathis et al. Vet Anaesth Analg. 2011 Sep;38(5):516-7. PMID: 21831059.
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