Fentanyl; Levomethadone; Methadone/Linezolid 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:

Serious. These medicines may interact and cause very harmful effects. Contact your healthcare professional (e.g. doctor or pharmacist) for more information.

How the interaction occurs:

Both of these medicines can increase the level of serotonin in your body.

What might happen:

High serotonin levels may cause changes in body temperature, blood pressure, and behavior or mood, leading to a medical condition called Serotonin Syndrome. Serotonin Syndrome may be life threatening.

What you should do about this interaction:

Make sure your healthcare professional (e.g. doctor or pharmacist) knows that you are taking these medicines together.If you experience muscle twitching, tremors, shivering and stiffness, fever, heavy sweating, heart palpitations, restlessness, confusion, agitation, trouble with coordination, or severe diarrhea contact your doctor right away.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.

View Reference
  • 1.Actiq (fentanyl citrate) US prescribing information. Cephalon, Inc. October, 2019.
  • 2.Duragesic (fentanyl) US prescribing information. Janssen Pharmaceuticals, Inc. October, 2019.
  • 3.Sublimaze (fentanyl citrate) US prescribing information. Akorn, Inc. October, 2019.
  • 4.Dolophine (methadone hydrochloride) US prescribing information. Wast-Ward Pharmaceuticals Corp. June, 2021.
  • 5.Levopidon (levomethadone) Swedish Summary of Product Characteristics. DNE Pharma AS November 30, 2018.
  • 6.DBL fentanyl injection Australian prescribing information. FH Faulding & Co Limited t/a David Bull Laboratories October 31, 2003.
  • 7.Actiq (fentanyl citrate) Australian prescribing information. Orphan Australia Pty Ltd. November 2, 2002.
  • 8.Diamorphine hydrochloride Australian prescribing information. Auralis March 13, 2008.
  • 9.Metharose (methadone hydrochloride) UK summary of product characteristics. Rosemone Pharmaceuticals Limited January 9, 2008.
  • 10.Zyvox (linezolid) US prescribing information. Pfizer Inc. November, 2021.
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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.