Mercaptopurine (Purinetol), the first treatment against leukemia.
Azathioprine (Imuran), the first immunosuppressive agent, used in organ transplantation.
Allopurinol (Zyloprim), against arthritis.
Pyrimethamine (Daraprim), against malaria.
Trimethoprim (Septra), effective against bacterial meningitis and some types of bacterial infections of the urinary and respiratory tract.
Acyclovir (Zovirax), against the herpes virus.
Nelarabine for the treatment of cancer.