|Synonyms||5-hydroxytryptamine, 5-HT, enteramine|
|Brand names||Not marketed|
Serotonin is a monoamine neurotransmitter, with other roles in the body, which is biosynthesized from the amino acid L-tryptophan with an intermediary step in its synthesis being 5-hydroxytryptophan (5-HTP; also called by the INN oxitriptan). Its roles are diverse and include: in sleep, memory, learning, perception, mood, addiction, blood clotting, stomach acid secretion, temperature regulation, digestive tract motility (how food moves through the digestive tract) and appetite. It also serves as a precursor to melatonin. It produces it effects by acting at the 5-HT1 (subtypes A, B, D, E, F), 5-HT2 (subtypes A, B, C), 5-HT3, 5-HT4, 5-HT5A, 5-HT6 and 5-HT7 receptors.