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Does Darunavir Cobicistat Emtricitabine And Tenofovir Alafenamide Interact with Alafenamide?

Darunavir Cobicistat Emtricitabine And Tenofovir Alafenamide and Alafenamide have a contraindicated drug interaction according to U.S. FDA drug labeling data. Tenofovir alafenamide (TAF) is a substrate of P-gp, BCRP, OATP1B1, and OATP1B3. Anticonvulsants: carbamazepine, phenobarbital, phenytoin ↓ cobicistat ↓ darunavir ↓ tenofovir alafenamide Co-administration is contraindicated due to potential for loss of therapeutic effect and development of resistance. Anticonvulsants with CYP3A induction effects that are NOT contraindicated: e.g., eslicarbazepine, oxcarbazepine ↓ cobicistat ↓ tenofovir alafenamide darunavir: effect unknown Consider alternative anticonvulsant or antiretroviral therapy to avoid potential changes in exposures. 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
Contraindicated
Darunavir Cobicistat Emtricitabine And Tenofovir Alafenamide Class
Cytochrome P450 3A Inhibitor
Management
Do not take together
Data Source
U.S. FDA via OpenFDA

What To Tell Your Doctor or Pharmacist

If you are taking Darunavir Cobicistat Emtricitabine And Tenofovir Alafenamide and your doctor is considering prescribing Alafenamide (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 about alternative medications that do not interact with your current regimen
  • Ask how frequently you should be monitored while these are co-prescribed
  • Never stop or change either medication without first consulting your healthcare provider
💊 Darunavir Cobicistat Emtricitabine And Tenofovir Alafenamide(Symtuza)+💊 Alafenamide(Genvoya)

Severity & Interaction Details

⛔
contraindicated
Avoid this combination
FDA labeling lists this pair as contraindicated. The risk outweighs the benefit in nearly all cases.
Severity scale
MinorContra
On record
Yes
Drug A class
Cytochrome P450 3A Inhibitor
Drug B class
—
Source
FDA drug label - darunavir, cobicistat, emtricitabine, and tenofovir alafenamide

What this means in plain English

Tenofovir alafenamide (TAF) is a substrate of P-gp, BCRP, OATP1B1, and OATP1B3. Anticonvulsants: carbamazepine, phenobarbital, phenytoin ↓ cobicistat ↓ darunavir ↓ tenofovir alafenamide Co-administration is contraindicated due to potential for loss of therapeutic effect and development of resistance. Anticonvulsants with CYP3A induction effects that are NOT contraindicated: e.g., eslicarbazepine, oxcarbazepine ↓ cobicistat ↓ tenofovir alafenamide darunavir: effect unknown Consider alternative anticonvulsant or antiretroviral therapy to avoid potential changes in exposures.

About Darunavir Cobicistat Emtricitabine And Tenofovir Alafenamide and Alafenamide

Darunavir Cobicistat Emtricitabine And Tenofovir Alafenamide is a Cytochrome P450 3A Inhibitor. You may recognize them by the brand names Symtuza and Genvoya. Both medications are taken by mouth. Both Darunavir Cobicistat Emtricitabine And Tenofovir Alafenamide and Alafenamide carry an FDA boxed warning — the agency's most serious safety designation.

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Data integrity: Every interaction shown is extracted directly from official U.S. FDA drug labeling via openFDA and the U.S. National Library of Medicine (NIH) — no interactions are invented, inferred, or manually edited. Maintained by CheckDrugInteractions.com. See our methodology or report a correction at support@checkdruginteractions.com.

Data sourced from U.S. FDA drug labeling via openFDA and the NIH National Library of Medicine, supplemented with a small number of well-established interactions from curated clinical references. For informational purposes only. Always consult your pharmacist or physician.