Metoprolol/Selected 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:

Some medicines may slow down how quickly your body processes metoprolol.

What might happen:

The amount of metoprolol in your blood may increase and cause more side effects than normal.

What you should do about this interaction:

Let your healthcare professionals (e.g doctor or pharmacist) know that you are taking these medicines together. Let your doctor know if you experience a slow heartbeat, weakness, fatigue, or dizziness. Your medicine may need to be adjusted.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.Lopressor (metoprolol tartrate) US prescribing information. Validus Pharmaceuticals. LLC March, 2013.
  • 2.Toprol-XL (metoprolol succinate) US prescribing information. AstraZeneca LP March, 2011.
  • 3.Werner U, Werner D, Rau T, Fromm MF, Hinz B, Brune K. Celecoxib inhibits metabolism of cytochrome P450 2D6 substrate metoprolol in humans. Clin Pharmacol Ther 2003 Aug;74(2):130-7.
  • 4.Somer M, Kallio J, Pesonen U, Pyykko K, Huupponen R, Scheinin M. Influence of hydroxychloroquine on the bioavailability of oral metoprolol. Br J Clin Pharmacol 2000 Jun;49(6):549-54.
  • 5.Wang Y, Zhou L, Dutreix C, Leroy E, Yin Q, Sethuraman V, Riviere GJ, Yin OQ, Schran H, Shen ZX. Effects of imatinib (Glivec) on the pharmacokinetics of metoprolol, a CYP2D6 substrate, in Chinese patients with chronic myelogenous leukaemia. Br J Clin Pharmacol 2008 Jun; 65(6):885-92.
  • 6.Kendall MJ, Jack DB, Quarterman CP, Smith SR, Zaman R. Beta-adrenoceptor blocker pharmacokinetics and the oral contraceptive pill. Br J Clin Pharmacol 1984;17 Suppl 1:87S-89S.
  • 7.Kendall MJ, Quarterman CP, Jack DB, Beeley L. Metoprolol pharmacokinetics and the oral contraceptive pill. Br J Clin Pharmacol 1982 Jul;14(1):120-2.
  • 8.Ranexa (ranolazine) US prescribing information. Gilead August, 2019. 9.Phansalkar S, van der Sijs H, Tucker AD, Desai AA, Bell DS, Teich JM, Middleton B, Bates DW. Drug-drug interactions that should be non-interruptive in order to reduce alert fatigue in electronic health records. J Am Med Inform Assoc 2012 Sep 25.

Selected from data included with permission and copyrighted by First Databank, Inc. This copyrighted material has been downloaded from a licensed data provider and is not for distribution, except as may be authorized by the applicable terms of use.

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.