Drug interactions
Fosamprenavir + Metformin-sitagliptin
Severity: Moderate
Fosamprenavir and Metformin-sitagliptin: 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
HIV protease inhibitors such as fosamprenavir can cause insulin resistance and hyperglycemia, which may reduce the effectiveness of metformin and sitagliptin. Glycemic control can worsen after starting the antiretroviral.
What this interaction means in plain words
Fosamprenavir and Metformin-sitagliptin 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.
Why it happens
Protease inhibitors induce insulin resistance and impair glucose metabolism, opposing the antidiabetic effect.
What to do
Monitor fasting glucose and HbA1c after starting or changing the protease inhibitor. Titrate the antidiabetic regimen as needed.
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
Frequently asked questions
Can I take Fosamprenavir with Metformin-sitagliptin?
MediHelp rates the interaction as moderate. Fosamprenavir and Metformin-sitagliptin 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. HIV protease inhibitors such as fosamprenavir can cause insulin resistance and hyperglycemia, which may reduce the effectiveness of metformin and sitagliptin. Glycemic control can worsen after starting the antiretroviral.
How serious is the interaction between Fosamprenavir and Metformin-sitagliptin?
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 fasting glucose and HbA1c after starting or changing the protease inhibitor. Titrate the antidiabetic regimen as needed.
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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