Drug interactions
Methyldopa + Risperidone
Severity: Moderate
Methyldopa and Risperidone: 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
Risperidone blocks alpha-1 adrenergic receptors and can add to the hypotensive effect of methyldopa, leading to orthostatic hypotension and dizziness. Dopaminergic interactions may also increase extrapyramidal symptoms.
What this interaction means in plain words
Methyldopa and Risperidone 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; Risperidone belongs to Central Nervous System.
Why it happens
Additive hypotensive effect via alpha-1 blockade and central sympatholytic action, with possible dopaminergic pharmacodynamic opposition.
What to do
Monitor blood pressure, including standing measurements, when combining. Adjust the dose of either drug if symptomatic hypotension or movement disorders occur.
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 Risperidone
- Ibutilide + Risperidone Contraindicated
- Risperidone + Vandetanib Contraindicated
- Adagrasib + Risperidone Major
- Amiodarone + Risperidone Major
- Amisulpride + Risperidone Major
- Amoxapine + Risperidone Major
Frequently asked questions
Can I take Methyldopa with Risperidone?
MediHelp rates the interaction as moderate. Methyldopa and Risperidone 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. Risperidone blocks alpha-1 adrenergic receptors and can add to the hypotensive effect of methyldopa, leading to orthostatic hypotension and dizziness. Dopaminergic interactions may also increase extrapyramidal symptoms.
How serious is the interaction between Methyldopa and Risperidone?
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 measurements, when combining. Adjust the dose of either drug if symptomatic hypotension or movement disorders occur.
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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