Drug interactions
Garlic + Nelfinavir
Severity: Moderate
Garlic and Nelfinavir: moderate interaction.
Last updated
For healthcare professionals — reference only. This page is a brief summary, not medical advice and not a substitute for official labeling or clinical judgement. Always verify before prescribing or dispensing.
Summary
Garlic supplements may lower exposure to HIV protease inhibitors. Reduced nelfinavir levels could lead to reduced antiviral efficacy and resistance.
What this interaction means in plain words
Garlic and Nelfinavir can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken.
Garlic belongs to Gastrointestinal Tract; Nelfinavir belongs to Anti Virals.
Why it happens
Possible induction of CYP3A4 or P-glycoprotein by garlic constituents; not firmly established.
What to do
Advise avoiding garlic supplements during nelfinavir therapy. Monitor HIV viral load if used.
What to ask your pharmacist
- Should I take them at different times of day?
- Does the dose of either medicine need to change?
- Is there anything I should avoid, such as alcohol or certain foods, while on both?
Pro+ members
Unlock the full page
Create an account and start a Pro+ trial to unlock the full management advice for Garlic and Nelfinavir, the additional notes, the evidence detail and the whole-prescription interaction checker.
- Full clinical management advice
- Additional notes
- Evidence detail
- Interaction checker for a whole prescription
Try Pro+ free for 14 days on the web. No card needed.
Other interactions of Garlic
- Garlic + Saquinavir Major
- Aceclofenac + Garlic Moderate
- Acemetacin + Garlic Moderate
- Aescin + Garlic Moderate
- Alteplase + Garlic Moderate
- Argatroban + Garlic Moderate
Other interactions of Nelfinavir
- Alfuzosin + Nelfinavir Contraindicated
- Avanafil + Nelfinavir Contraindicated
- Dronedarone + Nelfinavir Contraindicated
- Eletriptan + Nelfinavir Contraindicated
- Ergotamine + Nelfinavir Contraindicated
- Flibanserin + Nelfinavir Contraindicated
Frequently asked questions
Can I take Garlic with Nelfinavir?
MediHelp rates the interaction as moderate. Garlic and Nelfinavir can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken. Garlic supplements may lower exposure to HIV protease inhibitors. Reduced nelfinavir levels could lead to reduced antiviral efficacy and resistance.
How serious is the interaction between Garlic and Nelfinavir?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Advise avoiding garlic supplements during nelfinavir therapy. Monitor HIV viral load if used.
What other medicines interact with Garlic?
MediHelp also lists interactions of Garlic with, for example, Saquinavir, Aceclofenac, Acemetacin. The full list is on the Garlic page.
Full monographs, dosing and an interaction checker in the MediHelp app
Open the complete reference, check multi-drug interactions and use dosing tools in the MediHelp app.
