Drug interactions
Levocarnitine + Valproic acid
Severity: Moderate
Levocarnitine and Valproic acid: 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
Valproate can lower plasma carnitine and cause carnitine deficiency, which is linked to hyperammonemia and, rarely, hepatotoxicity. Levocarnitine supplementation is used to treat this deficiency, so the effect is a reason for supplementation rather than a harmful combination.
What this interaction means in plain words
Levocarnitine and Valproic acid 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
Valproate impairs carnitine biosynthesis and renal reabsorption and forms valproylcarnitine, depleting carnitine.
What to do
Consider levocarnitine in patients with symptomatic hyperammonemia, valproate toxicity or risk factors for deficiency. Monitor ammonia and carnitine levels.
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 Valproic acid
- Ertapenem + Valproic acid Contraindicated
- Imipenem / cilastatin / relebactam + Valproic acid Contraindicated
- Imipenem / cilastatin + Valproic acid Contraindicated
- Meropenem / vaborbactam + Valproic acid Contraindicated
- Meropenem + Valproic acid Contraindicated
- Calcium / magnesium / potassium / sodium oxybates + Valproic acid Major
Frequently asked questions
Can I take Levocarnitine with Valproic acid?
MediHelp rates the interaction as moderate. Levocarnitine and Valproic acid 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. Valproate can lower plasma carnitine and cause carnitine deficiency, which is linked to hyperammonemia and, rarely, hepatotoxicity. Levocarnitine supplementation is used to treat this deficiency, so the effect is a reason for supplementation rather than a harmful combination.
How serious is the interaction between Levocarnitine and Valproic acid?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Consider levocarnitine in patients with symptomatic hyperammonemia, valproate toxicity or risk factors for deficiency. Monitor ammonia and carnitine levels.
What other medicines interact with Valproic acid?
MediHelp also lists interactions of Valproic acid with, for example, Ertapenem, Imipenem / cilastatin / relebactam, Imipenem / cilastatin. The full list is on the Valproic acid page.
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