Prescription drugs are categorized somewhat differently under the traditional Medicare system. While certain drugs are included along with standard inpatient treatments in Medicare Part A, many of the outpatient drugs that may be necessary for your situation will not be covered.
There are two ways to get prescription drug coverage through Medicare. First, there are special plans called Medicare Prescription Drug Plans - Part D, each of which have their own lists of drugs covered under the plan.
Many of these plans have different tiers, within which the prices of drugs may vary based on their overall cost and uses. These different plans cover different prescription drugs, and can change the formulary of drugs from year-to-year with written notice to you 60 days prior to the date the change becomes active.
The second way is to get your drugs through a Medicare Advantage Plan.
In general these are both options that allow you to get additional benefits outside of those provided by the Medicare system, while helping you to manage the overall costs.