Codeine/Strong CYP2D6 Inhibitors Interactions
This information is generalized and not intended as specific medical advice. Consult your healthcare professional before taking or discontinuing any drug or commencing any course of treatment.
Medical warning:
Moderate. These medicines may cause some risk when taken together. Contact your healthcare professional (e.g. doctor or pharmacist) for more information.
How the interaction occurs:
Your body turns codeine into morphine. Some medicines may prevent your body from processing codeine into morphine.
What might happen:
If you take codeine and either bupropion, dacomitinib, fluoxetine, hydroquinidine, paroxetine, or quinidine together, your codeine may not work as well.
What you should do about this interaction:
If you notice less effects from your codeine, contact your healthcare professional (e.g. doctor or pharmacist). Your doctor may need to change your pain medication.Your healthcare professionals may already be aware of this interaction and may be monitoring you for it. Do not start, stop, or change the dosage of any medicine before checking with them first.
- 1.Caraco Y, Sheller J, Wood AJ. Pharmacogenetic determination of the effects of codeine and prediction of drug interactions. J Pharmacol Exp Ther 1996 Sep;278(3):1165-74.
- 2.Sindrup SH, Arendt-Nielsen L, Brosen K, Bjerring P, Angelo HR, Eriksen B, Gram LF. The effect of quinidine on the analgesic effect of codeine. Eur J Clin Pharmacol 1992;42(6):587-91.
- 3.Sindrup SH, Hofmann U, Asmussen J, Mikus G, Brosen K, Nielsen F, Ingwersen SH, Broen Christensen C. Impact of quinidine on plasma and cerebrospinal fluid concentrations of codeine and morphine after codeine intake. Eur J Clin Pharmacol 1996;49(6):503-9.
- 4.Desmeules J, Gascon MP, Dayer P, Magistris M. Impact of environmental and genetic factors on codeine analgesia. Eur J Clin Pharmacol 1991; 41(1):23-6.
- 5.This information is based on an extract from the Certara Drug Interaction Database (DIDB) Platform, Copyright Certara 1999-2023..
- 6.US Food and Drug Administration (FDA). Drug Development and Drug Interactions: Table of Substrates, Inhibitors and Inducers. Available at: https://www.fda.gov/drugs/drug-interactions-labeling/drug-development-and- drug-interactions-table-substrates-inhibitors-and-inducers. Updated 11/14/2017.
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CONDITIONS OF USE: The information in this database is intended to supplement, not substitute for, the expertise and judgment of healthcare professionals. The information is not intended to cover all possible uses, directions, precautions, drug interactions or adverse effects, nor should it be construed to indicate that use of a particular drug is safe, appropriate or effective for you or anyone else. A healthcare professional should be consulted before taking any drug, changing any diet or commencing or discontinuing any course of treatment.