Verapamil 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
Verapamil
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.
Verapamil can raise the levels of cariprazine (Vraylar) in your body. Verapamil slows down a liver enzyme called CYP3A4 that normally breaks cariprazine down. When that enzyme is slowed, more cariprazine and its active form build up. That can mean stronger effects and a higher chance of side effects like restlessness, trouble sleeping, dizziness, or feeling shaky.
The good news: this is a well-known interaction, and your care team can manage it easily by using a lower cariprazine dose while you are on verapamil. Please don't change anything on your own. Just check in with your pharmacist or doctor so they can set the right dose for you.
Mechanism: Verapamil is a moderate CYP3A4 inhibitor; cariprazine is a CYP3A4 substrate. Inhibition reduces clearance, increasing exposure (AUC/Cmax) of cariprazine and its active metabolite didesmethylcariprazine (DDCAR).
Direction: increased cariprazine effect. Evidence: probable. Severity: major.
Management (per labeling for moderate 3A4 inhibitors):
- Initiating cariprazine on verapamil (schizophrenia/bipolar mania): 1.5 mg every other day, titrate cautiously.
- Bipolar depression or adjunctive MDD: 1.5 mg every other day.
- Adding verapamil to stable cariprazine 1.5 or 3 mg daily: reduce to 1.5 mg every other day; on 4.5 or 6 mg daily: reduce to 1.5 mg daily.
- On verapamil discontinuation, cariprazine may need re-uptitration per response/tolerability.
What happens
Increased cariprazine and its major active metabolite (didesmethylcariprazine (DDCAR)) exposure
Interaction Deep Dive
Giving cariprazine (which is metabolized by CYP3A4) together with a moderate CYP3A4 inhibitor can raise the levels of both cariprazine and its active metabolite, didesmethylcariprazine. If cariprazine is being started in a patient already receiving a moderate CYP3A4 inhibitor (in the setting of schizophrenia or bipolar mania), begin with 1.5 mg orally every other day; this may be raised to 1.5 mg orally every other day if warranted, guided by clinical response and tolerability. For a patient on a moderate CYP3A4 inhibitor being treated for bipolar depression or receiving cariprazine as adjunctive therapy for MDD, the dose is 1.5 mg orally every other day. When a moderate CYP3A4 inhibitor is added to an established cariprazine regimen, dosing should be modified as follows: for those currently taking 1.5 or 3 mg once daily, reduce cariprazine to 1.5 mg orally every other day upon starting the inhibitor; for those currently taking 4.5 or 6 mg once daily, reduce cariprazine to 1.5 mg orally once daily upon starting the inhibitor. Should the moderate CYP3A4 inhibitor later be stopped, an increase in the cariprazine dose may be warranted according to clinical response and tolerability1.
Why it happens (mechanism)
Inhibition of CYP3A4-mediated metabolism of cariprazine
How to manage this interaction
Keep taking both medicines as prescribed unless your care team tells you otherwise. This interaction is manageable, and there are clear dose recommendations for it.
- Your team will likely use a lower cariprazine dose while you are on verapamil, and they will individualize it to you.
- If verapamil is later stopped, your cariprazine dose may need to be raised again based on how you are doing.
- Watch for and report side effects like restlessness, involuntary movements, drowsiness, or dizziness.
Ask your pharmacist or prescriber to review your exact doses so the plan fits your situation.
Management is individual — confirm any change with your pharmacist or prescriber.
Literature reports
1 report — tap to read
a) In drug interaction studies, giving cariprazine 1.5 mg/day together with erythromycin (a moderate CYP3A4 inhibitor) 500 mg twice daily for 21 days led to an increase in cariprazine AUC (0 to 24 hours) and Cmax by roughly 50% 1. In one study that enrolled only White males receiving cariprazine 1.5 mg/day and erythromycin 500 mg twice daily (n=40), AUCs rose by 38% (cariprazine), 11% (desmethylcariprazine, an active metabolite), and 60% (didesmethylcariprazine, an active metabolite), and Cmax by 34%, 16%, and 62%, respectively. Tmax was not altered by coadministration with erythromycin 2.
Common questions
Can I take Verapamil and Cariprazine together?
Verapamil raises cariprazine levels by slowing its breakdown, so your care team will typically use a lower cariprazine dose while you take both. Keep taking both as prescribed and confirm the right dose with your pharmacist or doctor. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Verapamil 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 Verapamil and Cariprazine interaction managed?
Keep taking both medicines as prescribed unless your care team tells you otherwise. This interaction is manageable, and there are clear dose recommendations for it. Your team will likely use a lower cariprazine dose while you are on verapamil, and they will individualize it to you. If verapamil is later stopped, your cariprazine dose may need to be raised again based on how you are doing. Watch fo… 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 Verapamil 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 Verapamil
Keep reading about Cariprazine
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