IMR Press / CEOG / Volume 34 / Issue 3 / pii/2007049

Clinical and Experimental Obstetrics & Gynecology (CEOG) is published by IMR Press from Volume 47 Issue 1 (2020). Previous articles were published by another publisher on a subscription basis, and they are hosted by IMR Press on as a courtesy and upon agreement with S.O.G.

Experimental Research

Extended administration of the association of zidovudine plus ritonavir during rat pregnancy: maternal and fetal effects

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1 ederal University of São Paulo School of Medicine (UNIFESP-EPM), São Paulo (Brazil)
2 Faculdade de Ciencias Misicas, Santa Casa de Misericórdia, São Paulo (Brazil)
3 Faculdade de Ciencias Misicas, Santa Casa de Misericórdia, São Paulo (Brazil)
Clin. Exp. Obstet. Gynecol. 2007, 34(3), 175–178;
Published: 10 September 2007

The purpose of the study was to evaluate at term, the effects of the association of zidovudine/ritonavir administered during the entire period of rat pregnancy. Forty pregnant EPM-1 Wistar rats were divided randomly into four groups: one control (drug vehicle control, n = 10) and three experimental treated with an oral solution of zidovudine/ritonavir (Exp 1 = 10/20 mg/kg bw, n = 10; Exp 2 = 30/60 mg/kg bw, n = 10; Exp 3 = 90/180 mg/kg bw, n = 10) from day 0 up to day 20 of pregnancy. Maternal body weights were recorded at the start of the experiment and at the 7th, 14th and the 20th day thereafter. At term (20th day) the rats were anesthetized and, upon laparotomy and hysterotomy, the number of implantations, resorptions, living fetuses, placentae and intrauterine deaths were recorded. The collected fetuses and placentae were weighed, and the concepts were examined under a stereoscopic microscope for external malformations. The maternal body gain and the mean fetal weight at term were both significantly lower (p < 0.01 and p < 0.0001, respectively) in the experimental groups compared to the control. The recorded resorptions were higher in Exp 2 and Exp 3 groups than in the control group. The other parameters were not affected. The exposure of pregnant rats at term to a 1:2 association of zidovudine plus ritonavir resulted in a significant reduction in maternal body weight gain and increased rate of fetal resorption.

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