Drug interactions
Didanosine + Fosamprenavir
Severity: Moderate
Didanosine and Fosamprenavir: 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
Buffered didanosine formulations may lower amprenavir absorption through increased gastric pH. This could reduce protease inhibitor exposure and antiviral efficacy.
What this interaction means in plain words
Didanosine and Fosamprenavir 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
Antacid buffer in didanosine raises gastric pH, possibly reducing fosamprenavir absorption.
What to do
Separate fosamprenavir from buffered didanosine by about 2 hours and monitor viral load.
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 Didanosine
- Didanosine + Elvitegravir / cobicistat / emtricitabine / tenofovir df Contraindicated
- Didanosine + Hydroxycarbamide Contraindicated
- Didanosine + Ribavirin Contraindicated
- Didanosine + Stavudine Contraindicated
- Allopurinol + Didanosine Major
- Atidarsagene autotemcel + Didanosine Major
Frequently asked questions
Can I take Didanosine with Fosamprenavir?
MediHelp rates the interaction as moderate. Didanosine and Fosamprenavir 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. Buffered didanosine formulations may lower amprenavir absorption through increased gastric pH. This could reduce protease inhibitor exposure and antiviral efficacy.
How serious is the interaction between Didanosine and Fosamprenavir?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Separate fosamprenavir from buffered didanosine by about 2 hours and monitor viral load.
What other medicines interact with Didanosine?
MediHelp also lists interactions of Didanosine with, for example, Elvitegravir / cobicistat / emtricitabine / tenofovir df, Hydroxycarbamide, Ribavirin. The full list is on the Didanosine page.
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