Canrenone 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
Canrenone
No brand names on record
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 acetaminophen with codeine for pain along with canrenone, a water pill (diuretic) that helps your body get rid of extra fluid. Here's what to know: codeine, like other opioids, can nudge your body to hold onto more water by releasing a hormone called antidiuretic hormone. In theory, that could make your water pill work a little less well, so you might notice less benefit or small changes in your blood pressure.
This concern is based on theory, not strong studies, so try not to worry. Keep taking both exactly as prescribed, and your care team can easily manage this by checking how you're doing and adjusting your diuretic dose if needed.
Effect: Potential reduction in diuretic (canrenone) efficacy when combined with codeine.
Mechanism: Opioid-mediated stimulation of antidiuretic hormone (ADH) release promotes water retention, pharmacodynamically opposing the natriuretic/diuretic effect. Codeine is a prodrug activated via CYP2D6, but this interaction is PD-based, not dependent on codeine metabolism.
- Direction: Reduced diuretic response (increases fluid retention).
- Onset: Unspecified.
- Evidence: Theoretical; severity graded major on file.
- Management: Monitor diuresis, fluid status, and blood pressure. Diuretic dose may be titrated upward as clinically indicated.
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 is a theoretical concern, and your care team can manage it well.
- Your team may monitor you more closely for signs the water pill isn't working as well, such as swelling, weight gain, or changes in blood pressure.
- Your diuretic dose may need to be adjusted and individualized by your care team if they see reduced effect.
- Tell your pharmacist or doctor if you notice new swelling in your legs, sudden weight gain, shortness of breath, or blood pressure changes.
Management is individual — confirm any change with your pharmacist or prescriber.
Common questions
Can I take Canrenone and Acetaminophen And Codeine together?
Codeine may slightly reduce how well your diuretic (canrenone) works by causing water retention, but this is theoretical and easily managed with monitoring and dose adjustment. Keep taking both and report any swelling, weight gain, or blood pressure changes to your care team. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Canrenone 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 Canrenone and Acetaminophen And Codeine interaction managed?
Keep taking both medications as prescribed unless your prescriber tells you otherwise. This is a theoretical concern, and your care team can manage it well. Your team may monitor you more closely for signs the water pill isn't working as well, such as swelling, weight gain, or changes in blood pressure. Your diuretic dose may need to be adjusted and individualized by your care team if they see red… 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 Canrenone 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
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