Why isn't bupropion the most frequently prescribed antidepressant?

Objective: Reviews of antidepressant medication efficacy suggest that all antidepressants are equally effective. Bupropion is less likely than other antidepressants to cause weight gain and sexual dysfunction, the 2 side effects that are of greatest concern to patients and that have the greatest impact on long-term compliance. If bupropion is as effective as other antidepressants, and it does not cause the side effects that are the most frequent causes of long-term noncompliance, then why isn't it the most frequently prescribed antidepressant medication? To understand psychiatrists' decision making at the time an antidepressant is chosen, we conducted the Rhode Island Factors Associated With Antidepressant Choice Survey (FAACS).