Drug Interaction Report

Methyldopa and Sotalol: Interaction Details

A pharmacist-reviewed analysis of the Methyldopa and Sotalol interaction: the documented clinical effects, severity rating, onset, mechanism, and management considerations, with cited references throughout.

AI-assisted, pharmacist-reviewed · Source data updated Aug 8, 2026 · Sources: FDA labeling, DDInter 2.0, cited literature

Methyldopa

Aldomet®
+

Sotalol

Betapace Betapace® Betapace® AF Sorine Sorine® Sotylize
Dr. Brian Staiger, PharmD, BCPS
Medically reviewed by
Dr. Brian Staiger, PharmD, BCPS
Updated Aug 8, 2026
Editorial policy · Data sources
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Interaction severity
Moderate
Can be significant — usually manageable with monitoring.
How we grade severity & evidence

Severity levels

  • Contraindicated: These should generally not be used together.
  • Major: Potentially serious — often needs a change or close monitoring.
  • Moderate: Can be significant — usually manageable with monitoring.
  • Minor: Usually limited clinical impact.

Evidence grades

  • Established: Well documented — supported by controlled studies or strong clinical data.
  • Probable: Good supporting evidence, though not definitively proven.
  • Suspected: Some evidence suggests this interaction, but it is not well established.
  • Possible: Limited or conflicting evidence; the interaction may occur.
  • Theoretical: Predicted from the drugs' pharmacology; not yet confirmed in people.

Ratings come from the documented interaction literature and are reviewed by a pharmacist. They describe the documented risk of the combination, not what will necessarily happen to you — your dose, timing, and health picture all matter.

Of 53 documented Methyldopa interactions, 37 are rated moderate — including this one.
Onset
rapid
Evidence
probable
Severity
Moderate

What happens

Exaggerated hypertensive response, tachycardia, or arrhythmias during physical stress or exposure to exogenous catecholamines

Interaction Deep Dive

Patients taking methyldopa and a beta-blocker may rarely experience paradoxical hypertensive responses to excess physiologic stress (endogenous catecholamines)2 or therapeutic use of exogenous catecholamines such as phenylpropanolamine 34.

Why it happens (mechanism)

Unopposed alpha adrenergic stimulation and increased pressor response

Literature reports

1 report — tap to read

a) This reaction has been reported with propranolol and practolol. Since beta-blockers have similar cardiovascular activity 1, the possibility of a hypertensive reaction should be considered when using any beta-blocker with methyldopa.

Common questions

Can I take Methyldopa and Sotalol together?

Exaggerated hypertensive response, tachycardia, or arrhythmias during physical stress or exposure to exogenous catecholamines Always confirm with your pharmacist or prescriber before making any change.

How serious is the Methyldopa and Sotalol interaction?

It is rated moderate. Can be significant — usually manageable with monitoring.

How quickly could this interaction happen?

The documented onset is "rapid". Effects can appear quickly, often within about 24 hours of combining the drugs.

How strong is the evidence for this interaction?

The evidence is graded "probable". Good supporting evidence, though not definitively proven.

Questions for your pharmacist

  • Does my dose of Methyldopa or Sotalol need adjusting while I take them together?
  • What symptoms should prompt me to call you or my prescriber right away?
  • Does the timing of my doses matter for this combination?
  • Is there anything you'd monitor while I'm on both?

References (4)

  1. Frishman W: Clinical pharmacology of the new beta-blocking drugs. Am Heart J 1979; 97:797-807.
  2. Nies AS & Shand DG: Hypertensive response to propranolol in a patient treated with methyldopa - a proposed mechanism. Clin Pharmacol Ther 1973; 14:823-826. DOI
  3. McLaren EH: Severe hypertension produced by interaction of phenylpropanolamine with methyldopa and oxprenolol. Br Med J 1976; 2:283-284. DOI
  4. Dollery CT, Harrington M, & Hodge JV: Haemodynamic studies with methyldopa: effect on cardiac output and response to pressor amines. Br Heart J 1963; 25:670. PubMed
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Methyldopa

Keep reading about Methyldopa

All Methyldopa interactions (53) Methyldopa drug information
Also serious with: Methylene Blue Selegiline Ozanimod Isocarboxazid
Sotalol

Keep reading about Sotalol

All Sotalol interactions (124) Sotalol drug information
Also serious with: Eribulin Injection Sertraline Oxaliplatin Injection Dasatinib
Beyond drug–drug

These medications also interact with supplements

Prescription drugs aren't the whole picture — herbal and dietary supplements can interact with them too. From the evidence-graded Natural Medicines database:

Methyldopa + Activated Charcoal American Hellebore American Mistletoe Beer Cowhage Siberian Cocklebur Tyramine Wine + 165 more
Sotalol + Activated Charcoal American Hellebore Arsenic Cesium Ephedra Grapefruit Indian Snakeroot Sida Cordifolia + 35 more

major · moderate · minor — check everything you take with our drug–supplement interaction checker.

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This information is for education, not a substitute for professional medical advice. Do not start, stop, or change any medication without talking to your pharmacist or prescriber.