Drug interactions
Bretylium + Methyldopa
Severity: Moderate
Bretylium 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
Both drugs lower blood pressure, and bretylium itself commonly causes hypotension through adrenergic neuron blockade. Combined use may produce additive or exaggerated hypotension, particularly on standing.
What this interaction means in plain words
Bretylium 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.
Why it happens
Additive sympatholytic effects: methyldopa acts centrally while bretylium blocks peripheral norepinephrine release.
What to do
Monitor supine and standing blood pressure, and reduce the methyldopa dose or hold it if hypotension develops.
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
Frequently asked questions
Can I take Bretylium with Methyldopa?
MediHelp rates the interaction as moderate. Bretylium 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. Both drugs lower blood pressure, and bretylium itself commonly causes hypotension through adrenergic neuron blockade. Combined use may produce additive or exaggerated hypotension, particularly on standing.
How serious is the interaction between Bretylium 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 supine and standing blood pressure, and reduce the methyldopa dose or hold it if hypotension develops.
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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