Modafinil 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
Modafinil
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.
Modafinil (Provigil) can speed up one of the liver enzymes (called CYP3A4) that your body uses to handle cariprazine (Vraylar). Here is the tricky part: that same enzyme both creates and clears the active pieces of cariprazine that do the work in your brain. Because of that, speeding it up could push cariprazine levels either direction, and the true effect has not been formally studied.
The practical concern is that your cariprazine may not work as steadily as expected. This is a manageable situation. Please do not stop or change either medicine on your own. Talk with your pharmacist or doctor so they can decide the best plan for you.
Mechanism: Modafinil is a moderate CYP3A4 inducer; cariprazine is a CYP3A4 substrate. CYP3A4 governs both the formation and elimination of cariprazine's active metabolites (desmethyl- and didesmethyl-cariprazine), so induction has an unpredictable net effect on total active moiety exposure.
- Direction: Uncertain; altered (potentially reduced) efficacy or unpredictable exposure.
- Evidence: Theoretical; not formally evaluated.
- Onset: Unspecified (enzyme induction is typically delayed, days to weeks).
- Management: Coadministration is not recommended. If unavoidable, monitor clinical response and tolerability closely; dose should be individualized by the care team. Consider a non-inducing alternative.
What happens
Effects on the cariprazine exposure has not been evaluated and the net effect is unclear
Interaction Deep Dive
It is advised against giving cariprazine (which is metabolized by CYP3A4) together with a CYP3A4 inducer. The generation and clearance of cariprazine's active metabolites depend on CYP3A4. How CYP3A4 inducers influence cariprazine exposure has not been studied, so the overall outcome remains uncertain1.
Why it happens (mechanism)
Induction of CYP3A4-mediated metabolism of cariprazine
How to manage this interaction
Guidelines say pairing cariprazine with a CYP3A4 inducer like modafinil is generally not recommended because the net effect on cariprazine has not been studied.
- Keep taking both as prescribed unless your prescriber tells you otherwise. Do not stop or adjust anything on your own.
- Your care team may watch you more closely for changes in how well the cariprazine is controlling your symptoms.
- Your dose may need to be adjusted and individualized by your team, or they may consider a different medicine.
- Tell your pharmacist or doctor about any return of symptoms or new side effects.
Management is individual — confirm any change with your pharmacist or prescriber.
Common questions
Can I take Modafinil and Cariprazine together?
Modafinil may unpredictably change how cariprazine works, so this combination is generally not recommended; ask your doctor or pharmacist whether it is right for you and expect closer monitoring if you use both. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Modafinil 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 Modafinil and Cariprazine interaction managed?
Guidelines say pairing cariprazine with a CYP3A4 inducer like modafinil is generally not recommended because the net effect on cariprazine has not been studied. Keep taking both as prescribed unless your prescriber tells you otherwise. Do not stop or adjust anything on your own. Your care team may watch you more closely for changes in how well the cariprazine is controlling your symptoms. Your dos… 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 Modafinil 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 (1)
- Product Information: VRAYLAR(R) oral capsules, cariprazine oral capsules. AbbVie Inc. (per FDA), North Chicago, IL, 2024. DailyMed
Keep reading about Modafinil
Keep reading about Cariprazine
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