The American Psychiatric Association (APA) has updated its Privacy Policy and Terms of Use, including with new information specifically addressed to individuals in the European Economic Area. As described in the Privacy Policy and Terms of Use, this website utilizes cookies, including for the purpose of offering an optimal online experience and services tailored to your preferences.

Please read the entire Privacy Policy and Terms of Use. By closing this message, browsing this website, continuing the navigation, or otherwise continuing to use the APA's websites, you confirm that you understand and accept the terms of the Privacy Policy and Terms of Use, including the utilization of cookies.

×
Published Online:https://doi.org/10.1176/ajp.130.6.707

Animal studies have indicated that marijuana has both a depressive and an excitatory effect on the central nervous system. Since drug users occasionally combine marijuana and amphetamines, a study was performed to determine whether the two drugs have an interaction effect on a variety of physiologic and psychological measures. In general, no such interaction was demonstrated. Previously reported physiological effects of marijuana and amphetamines were confirmed, although some of the psychological effects were at variance with previously reported findings.

Access content

To read the fulltext, please use one of the options below to sign in or purchase access.