Drug interactions
Methyldopa + Timolol
Severity: Moderate
Methyldopa and Timolol: 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
Stopping methyldopa while a nonselective beta-blocker is being taken can produce rebound hypertension because of unopposed alpha-adrenergic stimulation. The two drugs also have additive antihypertensive and bradycardic effects.
What this interaction means in plain words
Methyldopa and Timolol 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; Timolol belongs to Cardiovascular.
Why it happens
Withdrawal of central sympatholysis causes catecholamine surge, and beta-2 blockade leaves vasoconstriction unopposed; additive hypotensive effects otherwise.
What to do
If methyldopa is stopped, withdraw the beta-blocker first several days earlier, or monitor blood pressure closely. Monitor blood pressure and heart rate during combined use.
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 Timolol
- Acebutolol + Timolol Major
- Aldesleukin + Timolol Major
- Amifostine + Timolol Major
- Amiodarone + Timolol Major
- Arformoterol + Timolol Major
- Atenolol-chlorthalidone + Timolol Major
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 Methyldopa with Timolol?
MediHelp rates the interaction as moderate. Methyldopa and Timolol 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. Stopping methyldopa while a nonselective beta-blocker is being taken can produce rebound hypertension because of unopposed alpha-adrenergic stimulation. The two drugs also have additive antihypertensive and bradycardic effects.
How serious is the interaction between Methyldopa and Timolol?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: If methyldopa is stopped, withdraw the beta-blocker first several days earlier, or monitor blood pressure closely. Monitor blood pressure and heart rate during combined use.
What other medicines interact with Timolol?
MediHelp also lists interactions of Timolol with, for example, Acebutolol, Aldesleukin, Amifostine. The full list is on the Timolol page.
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