Avandamet (rosiglitazone/metformin)

  • Pharmacy Author:
    Omudhome Ogbru, PharmD

    Dr. Ogbru received his Doctorate in Pharmacy from the University of the Pacific School of Pharmacy in 1995. He completed a Pharmacy Practice Residency at the University of Arizona/University Medical Center in 1996. He was a Professor of Pharmacy Practice and a Regional Clerkship Coordinator for the University of the Pacific School of Pharmacy from 1996-99.

  • Medical and Pharmacy Editor: Jay W. Marks, MD
    Jay W. Marks, MD

    Jay W. Marks, MD

    Jay W. Marks, MD, is a board-certified internist and gastroenterologist. He graduated from Yale University School of Medicine and trained in internal medicine and gastroenterology at UCLA/Cedars-Sinai Medical Center in Los Angeles.

Type 2 Diabetes Warning Signs


Rosiglitazone is extensively metabolized or broken down by a group of liver enzymes known as CYP2C8. Gemfibrozil (Lopid), a known inhibitor of CYP2C8 may increase blood levels of rosiglitazone and consequently increase the risk of side effects. Concomitant use of agents that also inhibit CYP2C8 requires a reduction in the dose of rosiglitazone.

Rifampin (Rimactane or Rifadin), a known inducer of CYP2C8, increases the breakdown of rosiglitazone. Therefore, concomitant use of agents that induce CYP2C8 may decrease the effectiveness of rosiglitazone.

Drugs which cause blood glucose levels to increase may diminish the effectiveness of Avandamet therapy. These drugs include

PREGNANCY: Avandamet has not been adequately evaluated in pregnant women. Due to the lack of conclusive safety data, Avandamet should be used in pregnancy only if the potential benefit justifies the potential risk to the fetus. Avandamet is classified as FDA pregnancy risk category C.

NURSING MOTHERS: It is not known if Avandamet is excreted in breast milk. Due to the lack of safety data, Avandamet is not recommended for use in nursing mothers.

REFERENCE: FDA Prescribing Information

Medically Reviewed by a Doctor on 8/20/2015

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