TPH2 and drug-induced dyskinesia: Furthermore, carriers of at least one TPH2 rs7305115 A allele and at least one HTR1A rs6295 C allele had lower odds for MF (OR = 0.20; 95% CI = 0.06–0.71; p = 0.013) as well as dyskinesia (OR = 0.16; 95% CI = 0.04–0.60; p = 0.006).