Those expenses would qualify for itemized deductions on Schedule A, if you are able to itemize.
You can enter the Medicare drug premiums, and any amounts you paid in addition, such as co-pays, under Medical Expenses along with any other deductible medical expenses you have.
Medical expenses don't start to "count" as an itemized deduction until they exceed 10% of AGI (7.5% of AGI for those over age 65.) You enter all the expenses and the program calculates all that.
In order for itemized deductions to count, the total of your allowed medical expenses plus all your other itemized deductions (taxes, interest, donations, 2% miscellaneous deductions, etc.) has to exceed the standard deduction for your filing status. Once the toal of all those deductions exceeds the standard deduction, TurboTax will switch over to itemizing deductions on Schedule A.
