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Cetirizine in horses: pharmacokinetics and effect of ivermectin pretreatment
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Pharmacy, Department of Medicinal Chemistry.
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2007 (English)In: Journal of Veterinary Pharmacology and Therapeutics, ISSN 0140-7783, E-ISSN 1365-2885, Vol. 30, no 3, 194-200 p.Article in journal (Refereed) Published
Abstract [en]

The pharmacokinetics of the histamine H1-antagonist cetirizine and the effects of pretreatment with the antiparasitic macrocyclic lactone ivermectin on the pharmacokinetics of cetirizine were studied in horses. After oral administration of cetirizine at 0.2 mg/kg bw, the mean terminal half-life was 3.4 h (range 2.9–3.7 h) and the maximal plasma concentration 132 ng/mL (101–196 ng/mL). The time to reach maximal plasma concentration was 0.7 h (0.5–0.8 h). Ivermectin (0.2 mg/kg bw) given orally 1.5 h before cetirizine did not affect its pharmacokinetics. However, ivermectin pretreatment 12 h before cetirizine increased the area under the plasma concentration–time curve by 60%. The maximal plasma concentration, terminal half-life and mean residence time also increased significantly following the 12 h pretreatment. Ivermectin is an inhibitor of P-glycoprotein, which is a major drug efflux transporter in cellular membranes at various sites. The elevated plasma levels of cetirizine following the pretreatment with ivermectin may mainly be due to decreased renal secretion, related to inhibition of the P-glycoprotein in the proximal tubular cells of the kidney. The pharmacokinetic properties of cetirizine have characteristics which are suitable for an antihistamine, and this substance may be a useful drug in horses.

Place, publisher, year, edition, pages
2007. Vol. 30, no 3, 194-200 p.
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Veterinary Science
URN: urn:nbn:se:uu:diva-11238DOI: 10.1111/j.1365-2885.2007.00850.xISI: 000246151200002PubMedID: 17472650OAI: oai:DiVA.org:uu-11238DiVA: diva2:39006
Available from: 2007-06-26 Created: 2007-06-26 Last updated: 2011-04-06Bibliographically approved

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