"SERT inhibitors (e.g., serotonin specific reuptake inhibitors or SSRIs), which are widely used to treat depression, also are effective on serotonin signaling in the GI tract, resulting in significant gastrointestinal effects in many patients (Wang et al., 2018)
https://patentscope.wipo.int/search/en/detail.jsf?docId=US447971838&_cid=P20-M89BK3-30105-24