Accumulating evidence suggests that estradiol might be responsible for the enhanced response to psychostimulants sometimes observed in females. In this study, 10 healthy pre-menopausal women who were using oral, hormone-based birth control learned to discriminate 15 mg/70 kg oral d-amphetamine from placebo. Once a discrimination criterion was met (i.e., ≥ 80% correct responding at the final time point for five consecutive sessions), a range of doses of oral d-amphetamine (0, 3.125, 7.5 and 15 mg/70 kg) was tested alone and in combination with sublingual estradiol (0 and 0.25 mg). Test sessions were conducted during the oral contraception placebo phase when levels of both estradiol and progesterone were at their lowest. d-Amphetamine functioned as a discriminative stimulus and produced prototypical stimulant effects (e.g., increased positive subject-rated drug effects, elevated cardiovascular measures). Estradiol enhanced the discriminative-stimulus effects of the low dose, but not higher doses of d-amphetamine. Estradiol also enhanced d-amphetamine effects on a subset of self-report ratings (i.e., VAS Like Drug and total score on the Stimulant subscale of the Adjective-Rating Scale). These findings provide limited support for the notion that estradiol increases sensitivity to the psychostimulant effects of drugs such as d-amphetamine.
|Number of pages||9|
|Journal||Pharmacology Biochemistry and Behavior|
|State||Published - Jun 2007|
Bibliographical noteFunding Information:
The project described was made possible by grant P20 RR 15592 from the National Center for Research Resources (NCRR, THK). Its contents are solely the responsibility of the authors and do not necessarily represent the official views of NCRR or NIH. This research project was also supported by K01 DA 018772 from the National Institute on Drug Abuse (NIDA, JAL) and a grant from the University of Kentucky Research Foundation (SLK). The authors wish to thank Cleeve Emurian, Glenn Robbins, Beth Eaves, Susan Holliday, Kathryn Bylica and Oriaku Njoku for help in executing the study and preparation of the manuscript.
- Drug Discrimination
- Menstrual Cycle
ASJC Scopus subject areas
- Clinical Biochemistry
- Biological Psychiatry
- Behavioral Neuroscience