DRD2 and hyperinsulinemic hypoglycemia, familial, 4: Most available drugs in the market are designed to target only specific proteins: for instance, remoxipride, which is an antipsychotic drug selective for dopamine D2 receptors [79], ketamine, which is a dissociative anesthetic that targets ionotropic glutamate receptors [80,81], and mecasermin, which is used as a treatment for growth failure in patients with IGF-1 deficiency [81].