Relating to or affecting the neurotransmitter serotonin.
Serotonergic things are related to the chemical in the brain that makes you feel happy or calm.
Examples:
The serotonergic medicine helps people feel better.
She studies the serotonergic system in the brain.
The serotonergic effect makes people feel calm.
The serotonergic food made everyone happy.
The serotonergic music put everyone in a good mood.
The serotonergic drug changed his life for the better.