1, seven.2) ]. Challenges of Concomitant Use or Discontinuation of Cytochrome P450 2D6 Inhibitors The concomitant utilization of Promethazine with Codeine Oral Solution with all cytochrome P450 2D6 inhibitors (eg., amiodarone, quinidine) may cause a rise in codeine plasma concentrations plus a reduce in Energetic metabolite morphine plasma focus wh… Read More