Does Tocilizumab Interact with Simvastatin?
Tocilizumab and Simvastatin have a moderate drug interaction according to U.S. FDA drug labeling data. Tocilizumab may decrease simvastatin exposure by up to 57% due to increased CYP3A4 metabolism. Dose adjustment may be needed. The mechanism involves inhibition of il-6 signaling restores cyp450 activities, increasing metabolism of cyp3a4 substrates. Patients taking both medications should consult their healthcare provider before starting, stopping, or changing the dosage of either drug. This information is based on official FDA drug labeling sourced from OpenFDA and the NIH National Library of Medicine.
- Severity
- Moderate
- Tocilizumab Class
- Interleukin-6 Receptor Antagonist
- Simvastatin Class
- HMG-CoA Reductase Inhibitor
- Management
- Monitor for effects
- Data Source
- U.S. FDA via OpenFDA
How This Interaction Works
The interaction between Tocilizumab and Simvastatin occurs because inhibition of il-6 signaling restores cyp450 activities, increasing metabolism of cyp3a4 substrates. Clinically, this means tocilizumab may decrease simvastatin exposure by up to 57% due to increased cyp3a4 metabolism. dose adjustment may be needed. This is classified as a moderate interaction. While it may not require stopping either medication, your healthcare provider should be aware you are taking both so they can monitor for potential effects and adjust treatment if necessary.
What To Tell Your Doctor or Pharmacist
If you are taking Tocilizumab and your doctor is considering prescribing Simvastatin (or vice versa), make sure to:
- Inform your doctor and pharmacist of all current medications, including over-the-counter drugs and supplements
- Ask whether the benefits of combining these medications outweigh the risks for your specific situation
- Ask what symptoms to watch for that would indicate the interaction is causing problems
- Ask whether any dosage adjustments are needed
- Never stop or change either medication without first consulting your healthcare provider