HTR1A and Dyskinesia: These are eltoprazine, a 5-HT1A/B receptor agonist (Bomasang-Layno et al., 2015; Svenningsson et al., 2015), and buspirone, a partial agonist of the 5-HT1A receptor, which discretely ameliorates dyskinesia (Politis et al., 2014).