Gemfibrozil and Simvastatin interaction
Gemfibrozil and Simvastatin: both prescribing labels flag this combination with the strongest language, such as a contraindication, a boxed warning, or an instruction to avoid it.
Do not combine without a prescriber's guidance. The label language below is the strongest FDA uses.
What the FDA labels say
From the Gemfibrozil (Lopid) label · effective 2026-05-21
Combination therapy of gemfibrozil with simvastatin (see WARNINGS and PRECAUTIONS ).
The concomitant administration of LOPID with simvastatin is contraindicated (see CONTRAINDICATIONS and PRECAUTIONS ).
Combination therapy of gemfibrozil with simvastatin or with repaglinide, which are OATP1B1 substrates, is contraindicated (see CONTRAINDICATIONS ).
Drug Interactions (A) HMG-CoA Reductase Inhibitors The concomitant administration of LOPID with simvastatin is contraindicated (see CONTRAINDICATIONS and WARNINGS ).
Concomitant therapy with LOPID and an HMG-CoA reductase inhibitor is associated with an increased risk of skeletal muscle toxicity manifested as rhabdomyolysis, markedly elevated creatine kinase (CPK) levels, and myoglobinuria, leading in a high proportion of cases to acute renal failure and death.
From the Simvastatin (ZOCOR) label · effective 2025-03-28
Concomitant use of cyclosporine, danazol or gemfibrozil [see Drug Interactions (7.1) ] .
Concomitant use of cyclosporine, danazol or gemfibrozil ( 4 , 7.1 )
The concomitant use of ZOCOR with gemfibrozil, cyclosporine, or danazol is also contraindicated [see Contraindications (4) and Drug Interactions (7.1) ] .
Intervention: Concomitant use of cyclosporine, danazol, or gemfibrozil with ZOCOR is contraindicated [see Contraindications (4) ] .
Cyclosporine, Danazol, or Gemfibrozil Clinical Impact: The risk of myopathy and rhabdomyolysis is increased with concomitant use of cyclosporine, danazol, or gemfibrozil with ZOCOR.
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Open in the checkerNot medical advice. Interaction Checker quotes FDA label text and NIH fact sheets. Whether an interaction matters for you depends on doses, timing, kidney and liver function, and other conditions. Confirm with a pharmacist or prescriber.