The disclosure provides methods and compositions for treating a vascular, autoimmune, and/or inflammatory disease, or a condition associated therewith, with a dose of an inosine monophosphate dehydrogenase (IMPDH) inhibitor effective to treat the vascular, autoimmune and/or inflammatory disease, or associated condition but that does not produce immunosuppression sufficient to reduce the risk of allograft rejection. These lower doses of the immunosuppressant avoid the adverse consequences of severe immunosuppression while providing effective treatment of the vascular, autoimmune and/or inflammatory disease.
