Mycophenolic acid is primarily used as an immunosuppressive drug to prevent organ rejection in patients who have undergone kidney, heart, or liver transplants. It works by inhibiting the proliferation of T and B lymphocytes, which are crucial for the immune response. This helps to reduce the risk of the body attacking the transplanted organ.

In addition to its use in transplant medicine, mycophenolic acid is also employed in the treatment of certain autoimmune diseases, such as lupus and psoriasis, where it helps to modulate the overactive immune system. Its ability to suppress immune activity makes it a valuable therapeutic agent in managing conditions characterized by excessive immune responses.

Furthermore, mycophenolic acid has been explored in dermatology for treating severe skin conditions and in ophthalmology for managing autoimmune-related eye diseases. Its immunosuppressive properties are leveraged to control inflammation and prevent tissue damage in these specialized fields.