Serotonin syndrome is a potentially life-threatening condition resulting from excessive serotonergic activity in the central nervous system by mechanisms that may involve 5-HT1A receptors, 5-HT2 receptors, and 5-HT3 receptors (Binienda et al., 2018; Scotton et al., 2019). This evidence concerns the gene HTR1A and serotonin syndrome.