The use of medicinal herbs has increased over the past few years, and psychotropic herbs are among the most popular on the market. Patients and physicians may assume these products are safe; however, dietary supplements are not subject to the rigorous testing required for prescription medications. Problems that may occur with the use of psychotropic herbs include overuse or abuse, side effects, and herb-drug interactions. Ma huang, St. John's wort, and kava are examples of readily available herbs with the potential for negative effects. Physicians should improve their knowledge of these products so they can provide reliable information to their patients.