Nalidixic Acid and Cyclosporine Injection: Interaction Details
AI-assisted, pharmacist-reviewed · Source data updated Aug 8, 2026 · Sources: FDA labeling, DDInter 2.0, cited literature
Cyclosporine Injection
Nalidixic Acid
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.
What happens
Increased cycloSPORINE serum concentrations and risk of toxicity
Interaction Deep Dive
Concomitant use of cycloSPORINE with some quinolone antimicrobial agents has been shown to result in increased cycloSPORINE serum concentrations; a similar interaction may occur between cycloSPORINE and nalidixic acid1.
Why it happens (mechanism)
Unknown
Common questions
Can I take Nalidixic Acid and Cyclosporine Injection together?
Increased cycloSPORINE serum concentrations and risk of toxicity Always confirm with your pharmacist or prescriber before making any change.
How serious is the Nalidixic Acid and Cyclosporine Injection interaction?
It is rated moderate. Can be significant — usually manageable with monitoring.
How quickly could this interaction happen?
The documented onset is "unspecified". The timing of this interaction is not well characterized.
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 Nalidixic Acid or Cyclosporine Injection 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 (1)
- Product Information: NegGram(R), nalidixic acid. Sanofi-Synthelabo, Inc. New York, NY, 2004. DailyMed
Keep reading about Cyclosporine Injection
Keep reading about Nalidixic Acid
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:
major · moderate · minor — check everything you take with our drug–supplement interaction checker.
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