L-Methylfolate and Levodopa Oral Inhalation: Interaction Details
AI-assisted, pharmacist-reviewed · Source data updated Aug 8, 2026 · Sources: FDA labeling, DDInter 2.0, cited literature
Levodopa Oral Inhalation
L-Methylfolate
No brand names on record
How we grade severity & evidence
Severity levels
- Contraindicated: These should generally not be used together.
- Major: Potentially serious — often needs a change or close monitoring.
- Moderate: Can be significant — usually manageable with monitoring.
- Minor: Usually limited clinical impact.
Evidence grades
- Established: Well documented — supported by controlled studies or strong clinical data.
- Probable: Good supporting evidence, though not definitively proven.
- Suspected: Some evidence suggests this interaction, but it is not well established.
- Possible: Limited or conflicting evidence; the interaction may occur.
- Theoretical: Predicted from the drugs' pharmacology; not yet confirmed in people.
Ratings come from the documented interaction literature and are reviewed by a pharmacist. They describe the documented risk of the combination, not what will necessarily happen to you — your dose, timing, and health picture all matter.
What happens
Decreased l-methylfolate serum levels
Interaction Deep Dive
L-methylfolate is the bioactive form of folic acid and is used as a medical food. Although no studies have been conducted, coadministration of l-methylfolate with levodopa may decrease folate absorption, thereby reducing the amount of active folate available1.
Why it happens (mechanism)
Decreased folate absorption
Common questions
Can I take L-Methylfolate and Levodopa Oral Inhalation together?
Decreased l-methylfolate serum levels Always confirm with your pharmacist or prescriber before making any change.
How serious is the L-Methylfolate and Levodopa Oral Inhalation interaction?
It is rated minor. Usually limited clinical impact.
How quickly could this interaction happen?
The documented onset is "unspecified". The timing of this interaction is not well characterized.
How strong is the evidence for this interaction?
The evidence is graded "theoretical". Predicted from the drugs' pharmacology; not yet confirmed in people.
Questions for your pharmacist
- Does my dose of L-Methylfolate or Levodopa Oral Inhalation need adjusting while I take them together?
- What symptoms should prompt me to call you or my prescriber right away?
- Does the timing of my doses matter for this combination?
- Is there anything you'd monitor while I'm on both?
References (1)
- Product Information: Zervalx(R) oral tablets, l-methylfolate oral tablets. Pamlab,LLC, Covington, LA, 2008. DailyMed
Keep reading about Levodopa Oral Inhalation
Check another combination
Our instant two-drug interaction checker is almost here.
Still have questions about this combination?
Every question gets a real answer from a licensed pharmacist — free, and usually within a day.
Ask the pharmacist