Get our free Mitotane coupon and be eligible to receive a discount. You can reduce your Mitotane cost by up to 75% with our free Mitotane discount card. Bring it to a participating pharmacy near you to save on your prescription medication.Mitotane is a cancer medication that interferes with the growth and spread of cancer cells in the body. Mitotane is used to treat cancer of the adrenal gland (adrenal cortical carcinoma). Mitotane may also be used for purposes not listed in this medication guide.