Our findings show the more severe neutropenia effects may come from the targeting of GABRA1 by clozapine (GABRA1 score = 0.09, SE = 0.01) and olanzapine (GABRA1 score = 0.03, SE = 0.01) which is not targeted by other drugs, with an additional larger effect of HTR1B for clozapine (score = 1.24, SE = 0.27). Here, GABRA1 is linked to Decreased total neutrophil count.