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Study: Menstrual cycle affects cocaine addiction risk
Menstrual cycle may influence cocaine craving risk in women, a recent study suggests. According to the findings, menstrual cycle may influence addiction risk in women. In female rats, craving for cocaine during abstinence from the drug was stronger during estrus-the phase in which ovulation occurs-than non-estrus, and female rats were more prone to relapse of cocaine use than male rats.
"Sex differences are extremely important in addiction. This new study suggests that the period around ovulation is the most vulnerable period for promoting addiction. This knowledge has implications for both prevention and treatment," said John Krystal, lead author of the study.
"To the degree that results from animal models generalize to humans, our findings implicate the phase of the menstrual cycle as a risk factor for relapse in women and, therefore, should be taken into consideration in the development of relapse prevention treatments," said senior author Satoshi Ikemoto.
To assess the influence of the menstrual cycle on addiction, a group of researchers used a model of cocaine use in rats that mimics the intermittent binge-like pattern of human cocaine use. They compared this model with the standard rat model of cocaine use that provides continuous access to the drug. Although both access models led to progressively increased cocaine seeking during abstinence, referred to as incubation of cocaine craving, cocaine seeking was higher after intermittent access.
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