Drug interactions
Metformin-sitagliptin + Nelfinavir
Severity: Moderate
Metformin-sitagliptin 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
Nelfinavir has been associated with insulin resistance and hyperglycemia, which may reduce the effectiveness of metformin and sitagliptin. Glycemic control can worsen during therapy.
What this interaction means in plain words
Metformin-sitagliptin 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.
Metformin-sitagliptin belongs to Endocrine; Nelfinavir belongs to Anti Virals.
Why it happens
Protease inhibitors induce insulin resistance and impair glucose uptake (pharmacodynamic antagonism).
What to do
Monitor glucose and HbA1c during nelfinavir therapy. Adjust antidiabetic therapy if control worsens.
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?
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Other interactions of Metformin-sitagliptin
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 Metformin-sitagliptin with Nelfinavir?
MediHelp rates the interaction as moderate. Metformin-sitagliptin 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. Nelfinavir has been associated with insulin resistance and hyperglycemia, which may reduce the effectiveness of metformin and sitagliptin. Glycemic control can worsen during therapy.
How serious is the interaction between Metformin-sitagliptin 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: Monitor glucose and HbA1c during nelfinavir therapy. Adjust antidiabetic therapy if control worsens.
What other medicines interact with Metformin-sitagliptin?
MediHelp also lists interactions of Metformin-sitagliptin with, for example, Clozapine, Contrast media, Diatrizoate meglumine / diatrizoate. The full list is on the Metformin-sitagliptin page.
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