The premiums deducted from my gross Social Security payments for 2018 for Medicare B and D were in excess of SS guidelines basis my MAGI. 

May I take the excess amounts of these Medicare B and D premiums as tax credits? And if so, how may the excess amounts of these premiums be taken as tax credits? 

May I take the excess amounts of these Medicare B and D premiums as tax deductions? And if so, how may the excess amounts of these premiums be taken as tax deductions?