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one, seven.2) ]. Hazards of Concomitant Use or Discontinuation of Cytochrome P450 2D6 Inhibitors The concomitant utilization of Promethazine with Codeine Oral Option with all cytochrome P450 2D6 inhibitors (eg., amiodarone, quinidine) may perhaps result in a rise in codeine plasma concentrations along with a lower in Energetic metabolite morphine p