Troleandomycin 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
Troleandomycin
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.
Here's what's going on. Troleandomycin is a strong blocker of a liver enzyme (called CYP3A4) that your body uses to break down cariprazine (Vraylar). When that enzyme is blocked, cariprazine and its active form build up in your body. In studies with a similar strong blocker, levels roughly doubled.
Higher levels can mean more side effects like restlessness, tremor, drowsiness, or trouble with movement. The good news is this is very manageable. Your care team can simply lower your cariprazine dose or space it out while you're on both, and adjust it back later. Don't change anything on your own, just check in with your pharmacist or doctor.
Mechanism: Troleandomycin is a strong CYP3A4 inhibitor; cariprazine is a CYP3A4 substrate. Inhibition reduces clearance, increasing exposure to cariprazine and its long-acting active metabolite didesmethylcariprazine (PK interaction, increased AUC/Cmax).
Magnitude: Ketoconazole increased cariprazine AUC and Cmax by ~100%. Evidence: probable. Severity: major.
Management (per labeling):
- Initiating cariprazine on a strong inhibitor (schizophrenia/bipolar mania): 1.5 mg every 3 days, up to 1.5 mg every other day per response/tolerability.
- Bipolar depression or adjunctive MDD: 1.5 mg every 3 days.
- Stable 1.5 or 3 mg/day adding inhibitor: 1.5 mg every 3 days; stable 4.5 or 6 mg/day: 1.5 mg every other day.
- On inhibitor discontinuation, dose may need increasing per response.
What happens
Increased exposure to cariprazine and its active metabolite, didesmethylcariprazine
Interaction Deep Dive
Taking cariprazine (a substrate of CYP3A4) together with a potent CYP3A4 inhibitor can raise the levels of both cariprazine and its active metabolite, didesmethylcariprazine. In drug interaction studies, giving cariprazine alongside ketoconazole (a strong CYP3A4 inhibitor) produced roughly a 100% rise in both AUC and Cmax. Consequently, when starting cariprazine in a patient already on a strong CYP3A4 inhibitor (for schizophrenia or bipolar mania), begin with 1.5 mg orally every 3 days, then, if warranted by clinical response and tolerability, raise the dose to 1.5 mg orally every other day. For those 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 added while the patient is on a stable cariprazine regimen, adjustments depend on the current dose: for patients taking 1.5 or 3 mg once daily, change cariprazine to 1.5 mg orally every 3 days upon starting the inhibitor; for patients taking 4.5 or 6 mg once daily, change cariprazine to 1.5 mg orally every other day upon starting the inhibitor. Once the strong CYP3A4 inhibitor is stopped, the cariprazine dose may require an increase guided by clinical response and tolerability1.
Why it happens (mechanism)
Inhibition of CYP3A4-mediated metabolism of cariprazine
How to manage this interaction
This interaction is well understood and your care team can manage it. Because troleandomycin raises cariprazine levels, your prescriber may lower your cariprazine dose or space out how often you take it while you're on both drugs. The specific plan depends on why you take cariprazine and your current dose.
- Keep taking both exactly as prescribed unless your care team tells you otherwise.
- Watch for and report new side effects such as restlessness, tremor, stiffness, or unusual sleepiness.
- Remember that if the troleandomycin is later stopped, your cariprazine dose may need to be raised again, so tell your team about any changes.
Ask your pharmacist or doctor before making any changes yourself.
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 about 100% 1.
Common questions
Can I take Troleandomycin and Cariprazine together?
Troleandomycin can roughly double cariprazine levels, so your care team will likely reduce or space out your cariprazine dose while you're on both. Keep taking both as prescribed and report any new side effects. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Troleandomycin 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 Troleandomycin and Cariprazine interaction managed?
This interaction is well understood and your care team can manage it. Because troleandomycin raises cariprazine levels, your prescriber may lower your cariprazine dose or space out how often you take it while you're on both drugs. The specific plan depends on why you take cariprazine and your current dose. Keep taking both exactly as prescribed unless your care team tells you otherwise. Watch for… 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 Troleandomycin 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 Troleandomycin
Keep reading about Cariprazine
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