Here's what rhymes with serotonergic.

Consider these alternatives

dopaminergic / nondopaminergic noradrenergic / nonadrenergic neurotoxicity / activity neurotransmission / position cholinergic / noncholinergic dopamine / nine electrophysiological / logical sympathomimetic / mimetic norepinephrine / line monoamine / nine histamine / mean excitatory / story excitability / stability neonate / late glutamate / late psychoactive / attractive