Does Rifampin Interact with Simeprevir?
Rifampin and Simeprevir have a major drug interaction according to U.S. FDA drug labeling data. Antiretrovirals Prevention or Management: Avoid concomitant use Zidovudine Decrease AUC by 47% Indinavir Decrease AUC by 92% Efavirenz Decrease AUC by 26% Cortisol Receptor Blocker Mifepristone Prevention or Management: Avoid concomitant use Decrease exposure Hepatitis C Antiviral Prevention or Management: Avoid concomitant use Daclatasvir Decrease AUC by 79% Simeprevir Decrease AUC by 48% Sofosbuvir Decrease AUC by 72% Coadministration of sofosbuvir with rifampin may decrease sofosbuvir plasma concentrations, leading to reduced therapeutic effect of sofosbuvir. 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
- Major
- Rifampin Class
- Rifamycin Antibacterial
- Management
- Close medical supervision required
- Data Source
- U.S. FDA via OpenFDA
What To Tell Your Doctor or Pharmacist
If you are taking Rifampin and your doctor is considering prescribing Simeprevir (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 how frequently you should be monitored while these are co-prescribed
- Ask whether any dosage adjustments are needed
- Never stop or change either medication without first consulting your healthcare provider