Physiological and subjective effects of acute cocaine withdrawal (crash) in rats

Pharmacology, Biochemistry, and Behavior
D V GauvinF A Holloway


The physiological and subjective effects of high acute doses of cocaine and the subsequent homeostatic acute withdrawal syndrome were measured in rats. Radiotelemetry recordings of body temperature and activity were monitored in rats for 48 h after 32 mg/kg cocaine (COC) and saline (SAL) were administered by both intraperitoneal and subcutaneous (s.c.) routes. COC initially produced hypothermia and hyperactivity, followed by a prolonged hyperthermic and hypoactive rebound that seemed to peak around 12 h after injections. The s.c. route of administration produced the greatest rebound effect. Eight additional rats were monitored for EEG activity by telemetry for 48 h after SC administration of SAL or 32 mg/kg COC. COC produced an initial decrease in alpha and beta wavelength bands, with a trend toward increases in alpha and beta power demonstrated from the 10th through 14th h after injections. Using a three-choice haloperidol (HDL), saline, and COC drug discrimination task, we demonstrated a COC-like subjective state produced during the 10th through 12th h after a 32-mg/kg s.c. COC injection with no HDL-like responding engendered during any tested period of the acute or rebound effects of COC. These data provide evidence for an a...Continue Reading


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