The use of psychoactive substances is a major problem in modern society, causing social upheaval, economic and health of the user. In 2010, 26,4-36 million people used opioid analgesics for non-therapeutic purposes, and the frequency of alcohol abuse by health professionals, five times greater than the general population, due to easier access. The prevalence in use during pregnancy introduces rates ranging from 1% to 21%, accounting concern in society, since the effects caused on fetal development are not well understood. The aim of this study was to evaluate the neurobehavioral responses of adult rats after chronic exposure to morphine during the intrauterine period and lactation. Pregnant rats were given for 42 days subcutaneously, morphine 10 mg / kg / day. The offspring were weighed on days D1, D5, D10, D15, D20, D30, D60, and behavioral assays performed with the progeny to 2.5 months of age, which consisted of the open field model, elevated plus maze, forced swimming and rota-rod. The results demonstrated that exposure to morphine promote changes in the weight gain after the birth of offspring and even after weaning increase in spontaneous locomotion in females, as well as increased anxiogenic-like behavior and the behavior of the depressive type, regardless of sex, but without prejudice associated motor.
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