his report describes the routine method for producing spiroperidol by seven steps of chemical synthesis. Br-p-bromospiroperidol was prepared by reacting 77Br
H2O2 and spiroperidol in glacial acetic acid. The purity of the product was checked by TLC. The labelling rate was 92% and the overall radiochemical yield was 78% with radiochemical purity of 95%. The in vivo distribution of 77Br-p-bromospiroperidol in the mouse brain was studied. It was shown that the uptake of 77Br-p-bromospiroperidol in striatum was six times higher than that in cerebellum.