Drug interactions
Methyldopa + Quetiapine
Severity: Moderate
Methyldopa and Quetiapine: 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
Quetiapine has alpha-1 blocking properties that can add to the blood pressure lowering of methyldopa, producing orthostatic hypotension, dizziness and sedation. Elderly patients are most at risk of falls.
What this interaction means in plain words
Methyldopa and Quetiapine 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; Quetiapine belongs to Central Nervous System.
Why it happens
Additive hypotensive effects from alpha-1 adrenergic blockade and central sympatholytic action.
What to do
Monitor blood pressure and orthostatic symptoms during initiation and dose titration. Lower the dose of the antihypertensive 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 Quetiapine
- Adagrasib + Quetiapine Major
- Amiodarone + Quetiapine Major
- Amisulpride + Quetiapine Major
- Amoxapine + Quetiapine Major
- Anagrelide + Quetiapine Major
- Apalutamide + Quetiapine Major
Frequently asked questions
Can I take Methyldopa with Quetiapine?
MediHelp rates the interaction as moderate. Methyldopa and Quetiapine 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. Quetiapine has alpha-1 blocking properties that can add to the blood pressure lowering of methyldopa, producing orthostatic hypotension, dizziness and sedation. Elderly patients are most at risk of falls.
How serious is the interaction between Methyldopa and Quetiapine?
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 and orthostatic symptoms during initiation and dose titration. Lower the dose of the antihypertensive 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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