In Alexandria, Va., the rate of antidepressant use is the highest in the country, with a full 40 percent of residents receiving prescriptions. Cape Cod, Mass., tops the country in the use of stimulants, with 16 percent of the population filling at least one prescription, compared to a mean of 2.6 percent nationally. Gainsville, Fla., has the highest utilization rate of antipsychotics – 4.6 percent of residents, well above the national mean of .8 percent. Usage rates of the three classes of mental health medications vary widely across the U.S., with Connecticut in the middle, according to a new study by the Yale School of Management. The study found that much of the geographic variation could be explained by access to health care and pharmaceutical marketing efforts, rather than by the underlying prevalence rate of the psychiatric disorders.