Drug interactions
Methyldopa + Perphenazine
Severity: Moderate
Methyldopa and Perphenazine: 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
Phenothiazines can cause additive hypotension and sedation with methyldopa. Reports also describe dopamine-related effects such as worsened extrapyramidal or psychiatric symptoms with methyldopa, which acts as a false dopamine precursor. The combination is usually manageable with monitoring.
What this interaction means in plain words
Methyldopa and Perphenazine 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; Perphenazine belongs to Central Nervous System.
Why it happens
Additive hypotensive effects with possible pharmacodynamic opposition at dopaminergic and central adrenergic pathways.
What to do
Monitor blood pressure, orthostatic symptoms and movement disorders. Reduce the dose of either drug if hypotension or extrapyramidal signs develop.
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 Perphenazine
- Ibutilide + Perphenazine Contraindicated
- Perphenazine + Pimozide Contraindicated
- Perphenazine + Thioridazine Contraindicated
- Adagrasib + Perphenazine Major
- Alfentanil + Perphenazine Major
- Amiodarone + Perphenazine Major
Frequently asked questions
Can I take Methyldopa with Perphenazine?
MediHelp rates the interaction as moderate. Methyldopa and Perphenazine 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. Phenothiazines can cause additive hypotension and sedation with methyldopa. Reports also describe dopamine-related effects such as worsened extrapyramidal or psychiatric symptoms with methyldopa, which acts as a false dopamine precursor. The combination is usually manageable with monitoring.
How serious is the interaction between Methyldopa and Perphenazine?
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, orthostatic symptoms and movement disorders. Reduce the dose of either drug if hypotension or extrapyramidal signs develop.
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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