Drug interactions
Flecainide + Olanzapine
Severity: Moderate
Flecainide and Olanzapine: 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
Olanzapine has a modest QT-prolonging effect and flecainide can cause proarrhythmia and conduction delay. The combined risk is usually small but matters in patients with structural heart disease or other risk factors.
What this interaction means in plain words
Flecainide and Olanzapine 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.
Flecainide belongs to Cardiovascular; Olanzapine belongs to Central Nervous System.
Why it happens
Additive pharmacodynamic effects on cardiac repolarization and conduction.
What to do
Obtain a baseline ECG and monitor QTc and QRS after starting. Correct electrolyte abnormalities and avoid adding other QT-prolonging drugs.
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 Flecainide
- Flecainide + Nirmatrelvir Contraindicated
- Flecainide + Nirmatrelvir / ritonavir Contraindicated
- Flecainide + Pimozide Contraindicated
- Flecainide + Ritonavir Contraindicated
- Flecainide + Thioridazine Contraindicated
- Flecainide + Tipranavir Contraindicated
Other interactions of Olanzapine
Frequently asked questions
Can I take Flecainide with Olanzapine?
MediHelp rates the interaction as moderate. Flecainide and Olanzapine 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. Olanzapine has a modest QT-prolonging effect and flecainide can cause proarrhythmia and conduction delay. The combined risk is usually small but matters in patients with structural heart disease or other risk factors.
How serious is the interaction between Flecainide and Olanzapine?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Obtain a baseline ECG and monitor QTc and QRS after starting. Correct electrolyte abnormalities and avoid adding other QT-prolonging drugs.
What other medicines interact with Flecainide?
MediHelp also lists interactions of Flecainide with, for example, Nirmatrelvir, Nirmatrelvir / ritonavir, Pimozide. The full list is on the Flecainide page.
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