These icons appear on items to indicate the affected neurotransmitter(s).
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Dopaminergic. promotes the synthesis or activity of dopamine.

Endorphinergic. promotes the synthesis or activity of endorphins.

noradrenergic

Noradrenergic. promotes the synthesis or activity of noradrenaline.

Cholinergic. promotes the synthesis or activity of acetylcholine.

gabanergic

GABAnergic. promotes the synthesis or activity of GABA.

Serotonergic. promotes the synthesis or activity of serotonin.