Suzetrigine and Abemaciclib: Interaction Details
AI-assisted, pharmacist-reviewed · AI content regenerated Jul 11, 2026 · Source data updated Jul 10, 2026 · Sources: FDA labeling, DDInter 2.0, cited literature
Abemaciclib
Suzetrigine
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.
Let's talk about taking Verzenio (abemaciclib) and Journavx (suzetrigine) together. Your body uses an enzyme called CYP3A to process abemaciclib, which is your cancer medicine. Suzetrigine can speed that enzyme up, which means your body may clear the abemaciclib faster than it should.
The concern is that this could lower the amount of abemaciclib in your system and make it less effective. I want to be honest that this is based on theory more than real-world reports, so it isn't a reason to panic. The good news is that your cancer care team can manage this easily by adjusting doses and keeping a closer eye on you. Please don't stop either medicine on your own.
Interaction: Suzetrigine is reported to induce CYP3A. Abemaciclib is a sensitive CYP3A4 substrate, so co-administration may increase its metabolic clearance, reducing exposure (AUC/Cmax) and potentially compromising antitumor efficacy.
- Direction: Reduced abemaciclib effect (enzyme induction, not a prodrug).
- Severity: Major.
- Evidence: Theoretical.
- Onset: Unspecified; induction is typically delayed, and de-induction occurs on discontinuation.
Management: Abemaciclib dose may need individualized adjustment when starting or stopping suzetrigine. Note that stopping suzetrigine can raise abemaciclib exposure. Monitor for loss of efficacy and for toxicity after discontinuation.
What happens
Reduced sensitive CYP3A substrate with NTI exposure and reduced efficacy of sensitive CYP3A substrate with NTI
Interaction Deep Dive
Taking suzetrigine together with sensitive CYP3A substrates can lower the exposure of those substrates, potentially diminishing their effectiveness as well. When suzetrigine is started or stopped, the dose of the co-administered CYP3A substrates may need to be modified. Stopping suzetrigine can raise the exposure of sensitive CYP3A substrates that have an NTI1.
Why it happens (mechanism)
Induction of CYP3A-mediated metabolism by suzetrigine
How to manage this interaction
Here is how your care team typically handles this:
- Keep taking both exactly as prescribed unless your oncologist tells you otherwise.
- Your abemaciclib dose may need to be adjusted and individualized when suzetrigine is started or stopped.
- Your team may monitor you more closely to be sure your cancer treatment stays effective.
- Remember that stopping suzetrigine could raise your abemaciclib levels, so tell your team about any change.
Please let your pharmacist and oncologist know you are taking both, and check before making any changes to either medicine.
Management is individual — confirm any change with your pharmacist or prescriber.
Literature reports
1 report — tap to read
a) In a study evaluating drug interactions, giving suzetrigine 50 mg every 12 hours together with midazolam (a sensitive CYP3A substrate) at steady state reduced the geometric mean (90% CI) AUC (0 to inf) of midazolam by 48% (43-53%) and the Cmax by 37% (27-45%) 1.
Common questions
Can I take Suzetrigine and Abemaciclib together?
Suzetrigine may speed up how your body clears abemaciclib, possibly weakening your cancer treatment, so your oncology team may adjust the abemaciclib dose and watch you closely whenever suzetrigine is started or stopped. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Suzetrigine and Abemaciclib 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 Suzetrigine and Abemaciclib interaction managed?
Here is how your care team typically handles this: Keep taking both exactly as prescribed unless your oncologist tells you otherwise. Your abemaciclib dose may need to be adjusted and individualized when suzetrigine is started or stopped. Your team may monitor you more closely to be sure your cancer treatment stays effective. Remember that stopping suzetrigine could raise your abemaciclib levels,… 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 Suzetrigine or Abemaciclib 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: JOURNAVX oral tablets, suzetrigine oral tablets. Vertex Pharmaceuticals Inc (per FDA), Boston, MA, 2025. DailyMed
Keep reading about Abemaciclib
Keep reading about Suzetrigine
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