Clopidogrel and Pioglitazone: Interaction Details
AI-assisted, pharmacist-reviewed · Source data updated Aug 8, 2026 · Sources: FDA labeling, DDInter 2.0, cited literature
Clopidogrel
Pioglitazone
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 exposure of pioglitazone
Interaction Deep Dive
The exposure of pioglitazone, a CYP2C8 substrate, may be significantly increased when coadministered with clopidogrel, a CYP2C8 inhibitor, which may increase the risk for pioglitazone-related adverse effects. The pioglitazone AUC and concentration at 24 hours were significantly increased, and the half-life was significantly prolonged when pioglitazone was coadministered with clopidogrel1. Monitoring and dose adjustment may be necessary.
Why it happens (mechanism)
Inhibition of CYP2C8-mediated metabolism of pioglitazone by clopidogrel
Literature reports
1 report — tap to read
a) The mean pioglitazone AUC was significantly increased 2.1-fold, and the mean half-life was prolonged 1.7-fold, from 6.7 to 11 hours, when pioglitazone 15 mg was administered one hour after clopidogrel 300 mg on day 1, followed by 75 mg on days 2 and 3 compared with placebo in a randomized cross-over study in healthy volunteers (N=10); increases in pioglitazone AUC and half-life occurred in all clopidogrel-treated subjects. The pioglitazone Cmax was not significantly changed, however the pioglitazone concentration at 24 hours was increased 4.5-fold when administered with clopidogrel 1.
Common questions
Can I take Clopidogrel and Pioglitazone together?
Increased exposure of pioglitazone Always confirm with your pharmacist or prescriber before making any change.
How serious is the Clopidogrel and Pioglitazone 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 "probable". Good supporting evidence, though not definitively proven.
From our Q&A
Real reader questions about these medications, each personally answered by our pharmacist:
Questions for your pharmacist
- Does my dose of Clopidogrel or Pioglitazone 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)
- Itkonen MK, Tornio A, Neuvonen M, et al: Clopidogrel markedly increases plasma concentrations of CYP2C8 substrate pioglitazone. Drug Metab Dispos 2016; 44(8):1364-1371. PubMed
Keep reading about Clopidogrel
Keep reading about Pioglitazone
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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