Telithromycin 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
Telithromycin
No brand names on recordCariprazine
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.
These two medicines can build up together. Telithromycin is an antibiotic that strongly blocks a liver enzyme (called CYP3A4) that your body uses to break down cariprazine (Vraylar). When that enzyme is slowed down, more cariprazine and its active byproduct stay in your body. In studies with a similar strong blocker, levels roughly doubled.
Higher levels can mean more side effects, like restlessness, trouble sitting still, sleepiness, or shaky movements. The good news is this is very manageable. Please don't stop or change either medicine on your own. Your care team can lower or space out your cariprazine dose while you're on the antibiotic, and adjust it back afterward.
Effect: Telithromycin (strong CYP3A4 inhibitor) reduces metabolism of cariprazine (CYP3A4 substrate), increasing exposure to cariprazine and its active metabolite didesmethylcariprazine. Ketoconazole data showed ~100% increase in AUC and Cmax.
- Direction: increased cariprazine effect/toxicity risk (EPS, akathisia, sedation)
- Severity/evidence: major; probable
- Management (per labeling): Initiating cariprazine on inhibitor (schizophrenia/bipolar mania): 1.5 mg every 3 days, may increase to 1.5 mg every other day. Bipolar depression/MDD adjunct: 1.5 mg every 3 days. On stable 1.5-3 mg/day: reduce to 1.5 mg every 3 days; on 4.5-6 mg/day: reduce to 1.5 mg every other day. On inhibitor discontinuation, re-uptitrate per response.
What happens
Increased exposure to cariprazine and its active metabolite, didesmethylcariprazine
Interaction Deep Dive
When cariprazine (a substrate of CYP3A4) is given together with a potent CYP3A4 inhibitor, the exposure to both cariprazine and its active metabolite, didesmethylcariprazine, may rise. In drug interaction trials, giving cariprazine alongside ketoconazole (a strong CYP3A4 inhibitor) produced an increase in AUC and Cmax of roughly 100%. For this reason, if cariprazine is being started in a patient already receiving a strong CYP3A4 inhibitor (for schizophrenia or bipolar mania), begin at 1.5 mg orally every 3 days; this may be increased to 1.5 mg orally every other day if warranted, guided by clinical response and tolerability. For patients on a strong CYP3A4 inhibitor being treated for bipolar depression or receiving adjunctive therapy for MDD, use 1.5 mg orally every 3 days. If a strong CYP3A4 inhibitor is being started in a patient already on a stable cariprazine regimen: for those taking 1.5 or 3 mg once daily, reduce the cariprazine dose to 1.5 mg orally every 3 days when the inhibitor is begun; for those taking 4.5 or 6 mg once daily, reduce the cariprazine dose to 1.5 mg orally every other day when the inhibitor is begun. Once the strong CYP3A4 inhibitor is stopped, the cariprazine dose may require an increase depending on clinical response and tolerability1.
Why it happens (mechanism)
Inhibition of CYP3A4-mediated metabolism of cariprazine
How to manage this interaction
This interaction is manageable with dose adjustments. Keep taking both medicines as prescribed unless your care team tells you otherwise. Because telithromycin raises cariprazine levels, your team will typically use a lower, less frequent cariprazine dose while you are on the antibiotic.
- If you're already on cariprazine and starting telithromycin, your team may reduce your cariprazine dose (for example, spacing it to every 3 days or every other day depending on your current dose).
- When the antibiotic is stopped, your cariprazine dose may need to be increased again based on how you respond.
Tell your pharmacist or prescriber if you notice new restlessness, stiffness, tremor, or drowsiness.
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 0.5 mg/day together with ketoconazole 400 mg/day led to an increase in total cariprazine AUC and Cmax of roughly 100% 1.
Common questions
Can I take Telithromycin and Cariprazine together?
Telithromycin can roughly double cariprazine levels by blocking CYP3A4, so your prescriber will lower or space out your cariprazine dose while you're on the antibiotic and adjust it back afterward. Keep taking both as prescribed and report new restlessness, stiffness, or drowsiness. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Telithromycin 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 Telithromycin and Cariprazine interaction managed?
This interaction is manageable with dose adjustments. Keep taking both medicines as prescribed unless your care team tells you otherwise. Because telithromycin raises cariprazine levels, your team will typically use a lower, less frequent cariprazine dose while you are on the antibiotic. If you're already on cariprazine and starting telithromycin, your team may reduce your cariprazine dose (for ex… 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.
Questions for your pharmacist
- Does my dose of Telithromycin 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 Telithromycin
Keep reading about Cariprazine
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.
Check another combination
Our instant two-drug interaction checker is almost here.
Still have questions about this combination?
Every question gets a real answer from a licensed pharmacist — free, and usually within a day.
Ask the pharmacist