Abemaciclib and Influenza Virus Vaccine, Live: 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
Influenza Virus Vaccine, Live
No brand names on record
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.
Abemaciclib (Verzenio) is a cancer medicine that can weaken your immune system. The live nasal flu vaccine (the spray) contains a weakened but still living flu virus. Normally your immune system easily handles that weakened virus and builds protection. But when your defenses are lowered by cancer treatment, that live virus could actually cause an infection instead of just training your body.
Because of this, the live flu vaccine is generally not recommended while you are on this treatment. The good news: there is a safe path here. Your care team can offer the regular flu shot (which is not live) and will decide on the right timing for you.
Interaction: Abemaciclib, a CDK4/6 inhibitor used in breast cancer, can cause immunosuppression. Co-administration with the live attenuated influenza vaccine (LAIV) risks vaccine-derived infection because a blunted immune response may fail to contain the attenuated virus.
- Direction: reduced immune competence increases infection risk from the live vaccine
- Evidence: established; severity major
- Efficacy: LAIV immunogenicity not studied in immunocompromised patients
Management: Avoid LAIV in significantly immunocompromised patients. Use inactivated influenza vaccine instead. Live vaccines may be considered once malignancy is in remission with restored immunocompetence and chemotherapy discontinued at least 3 months.
What happens
An increased risk of infection by the live vaccine
Interaction Deep Dive
As a rule, live vaccines are not recommended for patients who are severely immunocompromised2. In the case of live influenza virus vaccine, its efficacy remains unstudied among immunocompromised individuals3. However, a live vaccine may be given to patients with leukemia, lymphoma, or other malignancies when their disease has entered remission, their immunocompetence has been restored, and chemotherapy has been stopped for a minimum of 3 months1.
Why it happens (mechanism)
Decreased immune response allows live vaccine to produce infection
How to manage this interaction
What your care team usually does:
- Generally avoids the live nasal-spray flu vaccine during abemaciclib treatment
- Offers the inactivated (not-live) flu shot as a safe alternative
- May consider a live vaccine only later, once the cancer is in remission, your immune system has recovered, and chemotherapy has been stopped for at least 3 months
What you should do:
- Do not stop or change your abemaciclib on your own
- Before getting any flu vaccine, tell your pharmacist or prescriber that you take abemaciclib so they can choose the right vaccine and timing for you
Management is individual — confirm any change with your pharmacist or prescriber.
Common questions
Can I take Abemaciclib and Influenza Virus Vaccine, Live together?
Avoid the live nasal-spray flu vaccine while on abemaciclib because your weakened immune system could let the vaccine virus cause an infection; ask your care team for the inactivated flu shot instead. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Abemaciclib and Influenza Virus Vaccine, Live 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 Abemaciclib and Influenza Virus Vaccine, Live interaction managed?
What your care team usually does: Generally avoids the live nasal-spray flu vaccine during abemaciclib treatment Offers the inactivated (not-live) flu shot as a safe alternative May consider a live vaccine only later, once the cancer is in remission, your immune system has recovered, and chemotherapy has been stopped for at least 3 months What you should do: Do not stop or change your abemaciclib… Management is individual — always follow your own care team's guidance.
How strong is the evidence for this interaction?
The evidence is graded "established". Well documented — supported by controlled studies or strong clinical data.
Questions for your pharmacist
- Does my dose of Abemaciclib or Influenza Virus Vaccine, Live 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 (3)
- Centers for Disease Control and Prevention (CDC): Vaccines & Immunizations: altered immunocompetence. Centers for Disease Control and Prevention (CDC). Atlanta, GA. 2024.
- National Center for Immunization and Respiratory Diseases (NCIRD): Vaccines & immunizations: contraindications and precautions. Centers for Disease Control and Prevention (CDC). Atlanta, GA. 2024.
- Product Information: FluMist(R) intranasal spray, influenza vaccine live intranasal spray. MedImmune LLC (per FDA), Gaithersburg, MD, 2024. DailyMed
Keep reading about Abemaciclib
Keep reading about Influenza Virus Vaccine, Live
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