Drug interactions
Quinidine + Topiramate
Severity: Minor
Quinidine and Topiramate: 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
Topiramate is a weak CYP3A4 inducer at higher doses and may lower quinidine concentrations. The effect is usually modest, but quinidine has a narrow therapeutic index.
What this interaction means in plain words
Quinidine and Topiramate have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised.
Quinidine belongs to Anti Parasitic; Topiramate belongs to Central Nervous System.
Why it happens
Weak induction of CYP3A4 increases quinidine metabolism.
What to do
Monitor the quinidine response and ECG, and check serum levels if efficacy appears reduced. Adjust the dose accordingly.
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 Quinidine
- Adagrasib + Quinidine Contraindicated
- Arsenic trioxide + Quinidine Contraindicated
- Artemether / lumefantrine + Quinidine Contraindicated
- Chloroquine + Quinidine Contraindicated
- Dofetilide + Quinidine Contraindicated
- Dronedarone + Quinidine Contraindicated
Other interactions of Topiramate
Frequently asked questions
Can I take Quinidine with Topiramate?
MediHelp rates the interaction as minor. Quinidine and Topiramate have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Topiramate is a weak CYP3A4 inducer at higher doses and may lower quinidine concentrations. The effect is usually modest, but quinidine has a narrow therapeutic index.
How serious is the interaction between Quinidine and Topiramate?
MediHelp rates it minor, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor the quinidine response and ECG, and check serum levels if efficacy appears reduced. Adjust the dose accordingly.
What other medicines interact with Quinidine?
MediHelp also lists interactions of Quinidine with, for example, Adagrasib, Arsenic trioxide, Artemether / lumefantrine. The full list is on the Quinidine page.
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