Drug interactions
Lacosamide + Saquinavir
Severity: Moderate
Lacosamide and Saquinavir: 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, usually given with ritonavir, inhibits CYP3A4 and may modestly increase lacosamide exposure. Saquinavir can also prolong PR and QT intervals, so combining it with lacosamide raises conduction concerns.
What this interaction means in plain words
Lacosamide and Saquinavir 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
CYP3A4 inhibition may raise lacosamide levels, with additive effects on cardiac conduction.
What to do
Check an ECG before starting in patients with cardiac disease or other conduction-affecting drugs, and monitor for bradycardia, dizziness and syncope. Lower the lacosamide dose if tolerability is poor.
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 Lacosamide
- Lacosamide + Zuranolone Major
- Atazanavir + Lacosamide Moderate
- Carbamazepine + Lacosamide Moderate
- Cenobamate + Lacosamide Moderate
- Clarithromycin + Lacosamide Moderate
- Daridorexant + Lacosamide Moderate
Frequently asked questions
Can I take Lacosamide with Saquinavir?
MediHelp rates the interaction as moderate. Lacosamide and Saquinavir 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, usually given with ritonavir, inhibits CYP3A4 and may modestly increase lacosamide exposure. Saquinavir can also prolong PR and QT intervals, so combining it with lacosamide raises conduction concerns.
How serious is the interaction between Lacosamide and Saquinavir?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Check an ECG before starting in patients with cardiac disease or other conduction-affecting drugs, and monitor for bradycardia, dizziness and syncope. Lower the lacosamide dose if tolerability is poor.
What other medicines interact with Lacosamide?
MediHelp also lists interactions of Lacosamide with, for example, Zuranolone, Atazanavir, Carbamazepine. The full list is on the Lacosamide page.
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