Promethazine Phenylephrine Codeine + Erythromycin Interaction
Majorinteraction on record
Description
CYP3A4 inhibitor may increase codeine plasma concentrations and morphine levels, potentially causing fatal respiratory depression.
Mechanism
CYP3A4 inhibition leading to increased codeine/morphine metabolism
Source: NLP:promethazine, phenylephrine, codeine