to investigate mechanisms of behavioral enhancement produced by repeated doses of amphetamines , the effects of apomorphine on 3,4-dihydroxyphenylacetic acid ( dopac ) and dopamine ( da ) levels were examined in various brain regions of the rat on the 4th day of withdrawal after repeated administration of saline or methamphetamine ( 3 mg/kg , s.c. ) twice daily for 14 days .
C0002667
amphetamines
C0025611
methamphetamine