How does the revised guideline differ from the original one? Medications that were not available or authorized for use in treating bipolar disorder before, but which during the past few years have been shown to be effective for it, are now referred to in the revised guideline, McIntyre said. For example, as Roy Perlis, M.D., an instructor in psychiatry at Harvard Medical School and a consultant to the work group that put the revised guideline together, pointed out: "The new guideline incorporates emerging data on newer anticonvulsants and atypical antipsychotics and tries to indicate where they might fit in our treatment decision making."