[The role of the genotype in the cataleptogenic effect of neuroleptics].

The cataleptogenic effects of three neuroleptics from one chemical group was investigated in 8 mice strains (CBA, A/He, C57B1/6, C3H/He, BALB/c, AKR, DD, and CC57Br. Despite significant interstrain, differences in the action of the drugs, haloperidol (0.5 mg/kg) and trifluperidol (0.5 mg/kg) produced much greater cataleptogenic action than fluspirilene (2 mg/kg). At the same time the intensity of catalepsy in various mice strains after haloperidol was not coincident with that after trifluperidol (r = 0.22): CBA mice displayed the maximum catalepsy, but AKR, DD and CC57Br mice, the minimum when haloperidol was given; with trifluperidol, the maximum catalepsy was observed in AKR mice, but absent in DD mice. Fluspirilene induced catalepsy only in CBA and A/He mice. Thus, the presence of catalepsy, a side effect of most neuroleptics, is largely predetermined by hereditary factors.