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Purpose: to evaluate the chronic action of primaquine diphosphate on the pregnancy of female albino rats. Methods: sixty pregnant female rats, separated into six groups, were used. Group I received daily, by gavage, 1 ml of distilled water from day zero to the 20th day of pregnancy (control group). The female rats of the other groups also received daily, by gavage, during the same period of time the volume of 1 ml containing gradually concentrated primaquine diphosphate solution: 0.25 mg/kg, group II; 0.50 mg/kg, group III; 0.75 mg/kg, group IV; 1.5 mg/kg, group V and 3.0 mg/kg, group VI. The maternal weights were considered on day zero and on the 7th, 14th and 20th days of pregnancy, when the matrices were sacrificed. Results: the results showed that primaquine diphosphate, in the used doses, did not interfere with none of the following variables: maternal weight, newborn weight, medium individual weight of fetuses, weight of the group of placentas and medium individual weight of the placentas, implantation number, number of placentas and number of fetuses, when compared with the control group. Also there was no case of reabsorption, malformation, maternal mortality or intrauterine death, in any of the studied groups. Conclusion: in the conditions of the study there were no contraindications for the continuous use of primaquine diphosphate during the pregnancy of the female rat.