Ethacrynic Acid and Acetaminophen And Codeine: Interaction Details
AI-assisted, pharmacist-reviewed · AI content regenerated Jul 11, 2026 · Source data updated Jun 30, 2026 · Sources: FDA labeling, DDInter 2.0, cited literature
Acetaminophen And Codeine
Ethacrynic Acid
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.
You've been prescribed Tylenol with codeine along with ethacrynic acid (Edecrin), which is a water pill that helps your body get rid of extra fluid. The concern here is that codeine, the opioid part, may cause your body to hold onto more water by nudging up a hormone that tells your kidneys to keep fluid in. In theory, that could make your water pill work a little less well, so you might notice more swelling or changes in your blood pressure.
The good news: this is based mostly on theory, not strong real-world proof. Keep taking both as prescribed. Your care team can watch how you're doing and adjust your water pill if needed.
Effect: Codeine may reduce the diuretic efficacy of ethacrynic acid (a loop diuretic).
Mechanism: Opioid-mediated increase in antidiuretic hormone (ADH) release promotes water retention, opposing diuresis. This is a pharmacodynamic interaction, not PK-based; codeine is a prodrug activated via CYP2D6, but that pathway is not relevant to this ADH effect. Acetaminophen is not implicated.
Onset: unspecified. Evidence: theoretical.
- Monitor for diminished diuresis (weight gain, edema, worsening fluid status).
- Monitor blood pressure and fluid balance.
- Diuretic dose may be titrated upward as clinically indicated by the care team.
What happens
Reduced diuretic efficacy
Interaction Deep Dive
Concomitant use of codeine with diuretics may reduce the efficacy of diuretics by inducing the release of anti-diuretic hormone. Monitor patients for signs of diminished diuresis and/or effects on blood pressure and increase the dosage of the diuretic as needed1.
Why it happens (mechanism)
Increased opioid-mediated release of antidiuretic hormone
How to manage this interaction
Keep taking both medications as prescribed unless your prescriber tells you otherwise. This interaction is based on theory, and it is manageable with monitoring.
- Watch for signs your water pill may be working less well: new or increasing swelling in the legs or ankles, sudden weight gain, or changes in your blood pressure.
- Your care team may check your fluid status and blood pressure more closely.
- If needed, your diuretic dose may be adjusted and individualized by your care team.
Tell your pharmacist or doctor if you notice more swelling, weight gain, or feel unusually puffy while taking these together.
Management is individual — confirm any change with your pharmacist or prescriber.
Common questions
Can I take Ethacrynic Acid and Acetaminophen And Codeine together?
Codeine may slightly reduce how well ethacrynic acid removes fluid by raising a water-retaining hormone, but this is theoretical. Keep taking both as prescribed and let your care team know about new swelling or weight gain so they can adjust and monitor. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Ethacrynic Acid and Acetaminophen And Codeine interaction?
It is rated major. Potentially serious — often needs a change or close monitoring.
How quickly could this interaction happen?
The documented onset is "unspecified". The timing of this interaction is not well characterized.
How is the Ethacrynic Acid and Acetaminophen And Codeine interaction managed?
Keep taking both medications as prescribed unless your prescriber tells you otherwise. This interaction is based on theory, and it is manageable with monitoring. Watch for signs your water pill may be working less well: new or increasing swelling in the legs or ankles, sudden weight gain, or changes in your blood pressure. Your care team may check your fluid status and blood pressure more closely.… Management is individual — always follow your own care team's guidance.
How strong is the evidence for this interaction?
The evidence is graded "theoretical". Predicted from the drugs' pharmacology; not yet confirmed in people.
Questions for your pharmacist
- Does my dose of Ethacrynic Acid or Acetaminophen And Codeine 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 a safer alternative to one of these medications for me?
References (1)
- Product Information: CARISOPRODOL, ASPIRIN, CODEINE PHOSPHATE oral tablets, carisoprodol, aspirin, codeine phosphate oral tablets. Ingenus Pharmaceuticals LLC (per DailyMed), Orlando, FL, 2021. DailyMed
Keep reading about Acetaminophen And Codeine
Keep reading about Ethacrynic Acid
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