The following medications are all typically prescribed to patients who have undergone an organ transplant EXCEPT?

Phenytoin is primarily utilized as an anticonvulsant to manage seizures, rather than being a standard medication prescribed for organ transplant patients. In the context of organ transplantation, the primary concern is the prevention of organ rejection, which is typically achieved through the use of immunosuppressive drugs.

Corticosteroids, such as prednisone, are commonly prescribed to dampen the immune response and minimize the risk of rejection. Azathioprine is another immunosuppressive agent that helps prevent the body from attacking the transplanted organ. Likewise, cyclosporin is a critical immunosuppressant specifically aimed at inhibiting lymphocyte activation to lower the chances of transplant rejection.

Therefore, while corticosteroids, azathioprine, and cyclosporine have direct roles in managing organ transplant patients' care, phenytoin does not fit into that category.