A serotonergic substance, medication, or receptor protein is one that affects neurotransmission pathways that involve serotonin, as follows:
Serotonergic drugs Serotonin receptor agonists Serotonin receptor antagonists Serotonin reuptake inhibitors Serotonin releasing agents Serotonergic psychedelics Serotonergic cells Serotonergic cell groups