Drug interactions
Nelfinavir + Zonisamide
Severity: Minor
Nelfinavir and Zonisamide: minor 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 inhibits CYP3A4 and may raise zonisamide concentrations, since CYP3A4 contributes to zonisamide metabolism. Higher levels may increase somnolence, dizziness and other dose-related adverse effects.
What this interaction means in plain words
Nelfinavir and Zonisamide have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised.
Nelfinavir belongs to Anti Virals; Zonisamide belongs to Central Nervous System.
Why it happens
Inhibition of CYP3A4 by nelfinavir reduces zonisamide metabolic clearance.
What to do
Watch for sedation, dizziness, and cognitive effects when starting nelfinavir. Reduce the zonisamide dose if adverse effects emerge.
What to ask your pharmacist
- Is there anything I should notice while taking both?
- Do I need to tell my doctor at the next visit?
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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
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 Nelfinavir with Zonisamide?
MediHelp rates the interaction as minor. Nelfinavir and Zonisamide have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Nelfinavir inhibits CYP3A4 and may raise zonisamide concentrations, since CYP3A4 contributes to zonisamide metabolism. Higher levels may increase somnolence, dizziness and other dose-related adverse effects.
How serious is the interaction between Nelfinavir and Zonisamide?
MediHelp rates it minor, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Watch for sedation, dizziness, and cognitive effects when starting nelfinavir. Reduce the zonisamide dose if adverse effects emerge.
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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