antidopaminergic

adjective

an·​ti·​do·​pa·​mi·​ner·​gic -ˌdō-pə-ˌmē-ˈnər-jik 

variants also anti-dopaminergic

: inhibiting or blocking the neurotransmitter activity of dopamine or related substances

Acute dystonia in children is nearly always the result of exposure to an antidopaminergic agent such as a neuroleptic, or antiemetic.

—Atlas of Pediatric Emergency Medicine

… none of our patients had extrapyramidal signs suggestive of an anti-dopaminergic effect.

—Richard J. Wyatt et al., Science