The chemical reactions and pathways resulting in the breakdown of serotonin (5-hydroxytryptamine), a monoamine neurotransmitter occurring in the peripheral and central nervous systems, also having hormonal properties. [ https://www.worldcat.org/search?q=bn%3A0198506732 GOC:jl ]
Synonyms: serotonin catabolism serotonin degradation serotonin breakdown