Drug interactions
Saquinavir + Zonisamide
Severity: Moderate
Saquinavir and Zonisamide: 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
Saquinavir, given with a booster, inhibits CYP3A4 and may raise zonisamide levels. This can increase somnolence, dizziness and other dose-related toxicity.
What this interaction means in plain words
Saquinavir and Zonisamide 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
Inhibition of CYP3A4-mediated zonisamide metabolism.
What to do
Monitor for zonisamide adverse effects and reduce the dose if they occur. Reassess dosing if the antiretroviral regimen is changed.
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 Zonisamide
- Zonisamide + Zuranolone Major
- Acetazolamide + Zonisamide Moderate
- Amisulpride + Zonisamide Moderate
- Amobarbital + Zonisamide Moderate
- Apalutamide + Zonisamide Moderate
- Asenapine transdermal + Zonisamide Moderate
Frequently asked questions
Can I take Saquinavir with Zonisamide?
MediHelp rates the interaction as moderate. Saquinavir and Zonisamide 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. Saquinavir, given with a booster, inhibits CYP3A4 and may raise zonisamide levels. This can increase somnolence, dizziness and other dose-related toxicity.
How serious is the interaction between Saquinavir and Zonisamide?
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 for zonisamide adverse effects and reduce the dose if they occur. Reassess dosing if the antiretroviral regimen is changed.
What other medicines interact with Zonisamide?
MediHelp also lists interactions of Zonisamide with, for example, Zuranolone, Acetazolamide, Amisulpride. The full list is on the Zonisamide page.
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