Drug interactions
Methyldopa + Olanzapine
Severity: Moderate
Methyldopa and Olanzapine: 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
Olanzapine can cause orthostatic hypotension, which may add to the blood pressure lowering of methyldopa. Antipsychotics may also cause confusion or other central effects with methyldopa.
What this interaction means in plain words
Methyldopa and Olanzapine 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 belongs to Cardiovascular; Olanzapine belongs to Central Nervous System.
Why it happens
Additive hypotensive effect through alpha-adrenergic blockade, with possible central dopaminergic interaction.
What to do
Monitor blood pressure, including standing readings, and counsel on dizziness. Reduce the antihypertensive dose if hypotension occurs.
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 Olanzapine
Frequently asked questions
Can I take Methyldopa with Olanzapine?
MediHelp rates the interaction as moderate. Methyldopa and Olanzapine 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. Olanzapine can cause orthostatic hypotension, which may add to the blood pressure lowering of methyldopa. Antipsychotics may also cause confusion or other central effects with methyldopa.
How serious is the interaction between Methyldopa and Olanzapine?
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 standing readings, and counsel on dizziness. Reduce the antihypertensive dose if hypotension occurs.
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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