Studies of responses to stimulant drugs have focused on a small number of candidate genes that have also been associated with other psychiatric phenotypes. Many of these genes are the direct targets of stimulant drugs or other known psychoactive agents. Table 1 lists these studies and they are also discussed in the following sections. Genes that have been less well studied both in relation to stimulant drugs and other psychiatric phenotypes are only briefly mentioned in the “Exploratory Studies” section and summarized in Table 2.
