Challenges of Concomitant Use or Discontinuation of Cytochrome P450 2D6 Inhibitors The concomitant utilization of tramadol hydrochloride tablets with all cytochrome P450 2D6 inhibitors (e.g., amiodarone, quinidine) could end in an increase in tramadol plasma degrees along with a reduce during the amounts of the Energetic metabolite, M1.Physical dep