Does Spironolactone Interact with Cosyntropin?
Spironolactone and Cosyntropin have a moderate drug interaction according to U.S. FDA drug labeling data. May falsely elevate plasma cortisol levels, affecting test accuracy. Should be stopped on day of COSYNTROPIN testing. The mechanism involves effect on cortisol or cortisol binding globulin levels. Patients taking both medications should consult their healthcare provider before starting, stopping, or changing the dosage of either drug. This information is based on official FDA drug labeling sourced from OpenFDA and the NIH National Library of Medicine.
- Severity
- Moderate
- Spironolactone Class
- Aldosterone Antagonist
- Cosyntropin Class
- Adrenocorticotropic Hormone
- Management
- Monitor for effects
- Data Source
- U.S. FDA via OpenFDA
How This Interaction Works
The interaction between Spironolactone and Cosyntropin occurs because effect on cortisol or cortisol binding globulin levels. Clinically, this means may falsely elevate plasma cortisol levels, affecting test accuracy. should be stopped on day of cosyntropin testing. This is classified as a moderate interaction. While it may not require stopping either medication, your healthcare provider should be aware you are taking both so they can monitor for potential effects and adjust treatment if necessary.
What To Tell Your Doctor or Pharmacist
If you are taking Spironolactone and your doctor is considering prescribing Cosyntropin (or vice versa), make sure to:
- Inform your doctor and pharmacist of all current medications, including over-the-counter drugs and supplements
- Ask whether the benefits of combining these medications outweigh the risks for your specific situation
- Ask what symptoms to watch for that would indicate the interaction is causing problems
- Ask whether any dosage adjustments are needed
- Never stop or change either medication without first consulting your healthcare provider