Antipsychotic use in pregnancy and risk of attention/deficit During 42 113 726 years of total follow-up time with a median of 9.9 years (25th to 75th percentile, 5.5–14.3 years), we identified 38 674 children with ASD, of whom 238 (1.5%) were exposed to antipsychotics in utero and 38 436 (0.9%) unexposed. Comparing the risk of ASD among exposed and unexposed children yielded a crude HR of 2 (95% CI