Fluconazole and Cariprazine: Interaction Details
AI-assisted, pharmacist-reviewed · AI content regenerated Jul 16, 2026 · Source data updated Jul 16, 2026 · Sources: FDA labeling, DDInter 2.0, cited literature
Fluconazole
Cariprazine
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.
Fluconazole (Diflucan) can slow down how your body breaks down cariprazine (Vraylar). When that happens, more cariprazine and its active form build up in your body, which can make its effects and side effects stronger. That might mean more drowsiness, restlessness, or feeling shaky or dizzy.
The good news is that this is very manageable. Your care team may simply use a lower cariprazine dose or space it out (like every other day) while you are on fluconazole, and go back to your usual dose once the fluconazole is finished. Please don't change anything on your own, just check with your pharmacist or doctor so they can tailor the dose for you.
Mechanism: Fluconazole is a moderate CYP3A4 inhibitor; cariprazine is a CYP3A4 substrate. Inhibition reduces metabolism, increasing exposure to cariprazine and its long-acting active metabolite didesmethylcariprazine (DDCAR). Direction is increased effect/toxicity risk.
Evidence: Probable. Severity: major. Onset: unspecified (note DDCAR's long half-life prolongs any effect).
Management (dose reduction per labeling):
- New start (schizophrenia/bipolar mania): 1.5 mg PO every other day, titrate to 1.5 mg daily per response.
- Bipolar depression/MDD adjunct: 1.5 mg every other day.
- Stable 1.5-3 mg/day: reduce to 1.5 mg every other day.
- Stable 4.5-6 mg/day: reduce to 1.5 mg once daily.
- On inhibitor discontinuation, re-titrate upward per tolerability. Monitor for EPS, akathisia, sedation.
What happens
Increased cariprazine and its major active metabolite (didesmethylcariprazine (DDCAR)) exposure
Interaction Deep Dive
Taking cariprazine (a CYP3A4 substrate) together with a moderate CYP3A4 inhibitor can raise the exposure of both cariprazine itself and its active metabolite, didesmethylcariprazine. If cariprazine therapy is being started in a patient already on a moderate CYP3A4 inhibitor (for schizophrenia or bipolar mania), begin dosing at 1.5 mg orally every other day, then, if warranted by clinical response and tolerability, increase to 1.5 mg orally every other day. For a patient on a moderate CYP3A4 inhibitor who is treating bipolar depression or receiving adjunctive therapy for MDD, the dose is 1.5 mg orally every other day. When a moderate CYP3A4 inhibitor is added for a patient already stabilized on cariprazine: those currently taking 1.5 or 3 mg once daily should have their cariprazine reduced to 1.5 mg orally every other day upon starting the moderate inhibitor. Those currently taking cariprazine 4.5 or 6 mg once daily should have the dose changed to 1.5 mg orally once daily when the moderate inhibitor is begun. Should the moderate CYP3A4 inhibitor be stopped, an increase in the cariprazine dosage may be required, guided by clinical response and tolerability1.
Why it happens (mechanism)
Inhibition of CYP3A4-mediated metabolism of cariprazine
How to manage this interaction
Both medicines can be used together safely when your care team plans for it. Because fluconazole raises cariprazine levels, your prescriber will typically lower your cariprazine dose or take it every other day while you are on fluconazole.
- Keep taking both exactly as prescribed unless told otherwise.
- Expect that your cariprazine dose may be individualized and adjusted based on how you feel and tolerate it.
- Tell your team about new or worsening restlessness, tremor, stiffness, sleepiness, or dizziness.
- When fluconazole is stopped, your cariprazine dose may be raised back up.
Ask your pharmacist or doctor before changing anything on your own.
Management is individual — confirm any change with your pharmacist or prescriber.
Literature reports
1 report — tap to read
a) In drug interaction investigations, giving cariprazine 1.5 mg/day together with erythromycin (a moderate CYP3A4 inhibitor) 500 mg twice daily over 21 days led to an increase in cariprazine AUC (0 to 24 hours) and Cmax of roughly 50% 1. In a single study that enrolled only White males taking cariprazine 1.5 mg/day plus erythromycin 500 mg twice daily (n=40), AUCs rose by 38% (cariprazine), 11% (desmethylcariprazine, an active metabolite), and 60% (didesmethylcariprazine, an active metabolite), while Cmax increased by 34%, 16%, and 62%, respectively. Tmax remained unaffected by concurrent erythromycin administration 2.
Common questions
Can I take Fluconazole and Cariprazine together?
Fluconazole raises cariprazine levels, so your cariprazine dose is usually lowered or given less often while you take it, then adjusted back up when fluconazole stops. Keep taking both as prescribed and let your care team make the dose changes. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Fluconazole and Cariprazine 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 Fluconazole and Cariprazine interaction managed?
Both medicines can be used together safely when your care team plans for it. Because fluconazole raises cariprazine levels, your prescriber will typically lower your cariprazine dose or take it every other day while you are on fluconazole. Keep taking both exactly as prescribed unless told otherwise. Expect that your cariprazine dose may be individualized and adjusted based on how you feel and tol… Management is individual — always follow your own care team's guidance.
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 Fluconazole or Cariprazine 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 (2)
- Product Information: VRAYLAR(R) oral capsules, cariprazine oral capsules. AbbVie Inc. (per FDA), North Chicago, IL, 2024. DailyMed
- Szabo M, Hujber Z, Harsanyi J, et al: Coadministration of cariprazine with a moderate CYP3A4 inhibitor in patients with schizophrenia: implications for dose adjustment and safety monitoring. Clin Pharmacokinet 2024; 63(10):1501-1510. PubMed
Keep reading about Fluconazole
Keep reading about Cariprazine
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