Drug interactions
Levodopa + Methyldopa
Severity: Moderate
Levodopa and Methyldopa: 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
Methyldopa may enhance the hypotensive effect of levodopa and can also increase levodopa's central effects, including psychiatric symptoms. Methyldopa also inhibits dopa decarboxylase, which may alter levodopa response.
What this interaction means in plain words
Levodopa and Methyldopa 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.
Levodopa belongs to Central Nervous System; Methyldopa belongs to Cardiovascular.
Why it happens
Additive hypotension and interference with dopa decarboxylase and catecholamine synthesis, both drugs acting on the same pathway.
What to do
Monitor blood pressure, including orthostatic readings, and watch for confusion or psychosis. Lower the levodopa or antihypertensive dose if symptoms appear.
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 Methyldopa
- Methyldopa + Tranylcypromine Contraindicated
- Iobenguane i + Methyldopa Major
- Lofexidine + Methyldopa Major
- Methyldopa + Pexidartinib Major
- Methyldopa + Pretomanid Major
- Methyldopa + Thioridazine Major
Other interactions of Levodopa
- Isocarboxazid + Levodopa Contraindicated
- Levodopa + Phenelzine Contraindicated
- Levodopa + Phenelzine (nonselective MAOI) Contraindicated
- Levodopa + Procarbazine Contraindicated
- Levodopa + Tranylcypromine Contraindicated
- Amisulpride + Levodopa Major
Frequently asked questions
Can I take Levodopa with Methyldopa?
MediHelp rates the interaction as moderate. Levodopa and Methyldopa 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. Methyldopa may enhance the hypotensive effect of levodopa and can also increase levodopa's central effects, including psychiatric symptoms. Methyldopa also inhibits dopa decarboxylase, which may alter levodopa response.
How serious is the interaction between Levodopa and Methyldopa?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor blood pressure, including orthostatic readings, and watch for confusion or psychosis. Lower the levodopa or antihypertensive dose if symptoms appear.
What other medicines interact with Methyldopa?
MediHelp also lists interactions of Methyldopa with, for example, Tranylcypromine, Iobenguane i, Lofexidine. The full list is on the Methyldopa page.
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