Point of information:
There seems to be some confusion here. Medicaid is for individuals who have limited financial resources but are under the age of 65 and are unable to afford medical care. It is a means tested program that provides coverage for those earning less than 130% of the federal poverty line.
Medicare is a federal program for those that are 65 or older, but in some circumstances will cover minors under certain circumstances or individuals experienced end stage renal failure. Medicare is not means tested for retirees. Retirees pay for medicare out of their Social Security benefits (and prior payroll deductions). Retirees will often purchase supplemental ins for additional coverage.
There is an updated drug formulary for Medicaid online if you or your physician are having difficulty determining if a certain drug is covered. FWIW if your physician is prescribing the off label use of a drug it won’t be covered by medicaid.