in this paper we have studied the effects of morphine , codeine , fentanyl , pentazocine , etorphine and fluphenazine ( all drugs injected i.p . ) on stereotyped behaviour induced by methylphenidate 60 mg/kg i.p. , as well as induced by apomorphine 5 mg/kg s.c. in mice .
C0026549
morphine
C0009214
codeine