Abemaciclib and Varicella 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
Varicella 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.
This is an important safety combination to be aware of. Abemaciclib (Verzenio) is a cancer medicine that can weaken your immune system. The chickenpox (varicella) vaccine is a live vaccine, meaning it contains a weakened but living form of the virus. In a healthy person, the immune system easily controls that weakened virus. But if your immune system is dialed down by cancer treatment, the vaccine virus can actually spread and cause a real infection, including a widespread rash.
Because of this, the live chickenpox vaccine is generally not given while you are on this treatment. The good news is your care team plans vaccines carefully. Talk with your oncologist or pharmacist before getting any vaccine so they can pick the right type and timing for you.
Contraindicated combination. Abemaciclib is a CDK4/6 inhibitor used in cancer therapy and can contribute to immunosuppression. Varicella vaccine is a live-attenuated vaccine.
- Mechanism: blunted host immune response permits uncontrolled replication of the attenuated vaccine strain.
- Effect: risk of disseminated varicella and extensive vaccine-associated rash.
- Evidence: established; consistent with CDC guidance.
Live varicella-containing vaccines are contraindicated in patients receiving chemotherapy or long-term immunosuppressive therapy, and in those with hematologic or solid tumors. Defer live vaccination; per CDC, live vaccines may be considered once disease is in remission, immunocompetence is restored, and chemotherapy has been discontinued for at least 3 months. Prefer non-live alternatives when available and coordinate timing with the oncology team.
What happens
An increased risk of infection by the live vaccine
Interaction Deep Dive
The varicella vaccine should not be given to people whose immune systems are compromised or suppressed, whether because of an underlying illness or because of medical treatment. Cases of disseminated varicella disease and widespread vaccine-associated rash have occurred in immunosuppressed or immunodeficient individuals who were unintentionally given a varicella-containing vaccine3. According to CDC guidance, the varicella vaccine is contraindicated in patients who have hematologic and solid tumors, are undergoing chemotherapy, have congenital immunodeficiency, or are on long-term immunosuppressive therapy 2. A live vaccine may be administered to patients with leukemia, lymphoma, or other malignancies once their disease is in remission, their immunocompetence has been restored, and chemotherapy has been stopped for a minimum of 3 months 1.
Why it happens (mechanism)
Decreased immune response allows live vaccine to produce infection
How to manage this interaction
Keep taking your abemaciclib as prescribed and do not stop it on your own. The key here is avoiding the live varicella vaccine while your immune system is suppressed by treatment.
- Tell any provider offering you a vaccine that you are on abemaciclib (Verzenio) for cancer.
- Let your oncology team decide on vaccine type and timing, since live vaccines are generally avoided during treatment.
- Per CDC guidance, a live vaccine may become appropriate once your disease is in remission, your immune function has recovered, and chemotherapy has stopped for at least 3 months.
Ask your pharmacist or oncologist before scheduling any vaccination so they can choose the safest option for you.
Management is individual — confirm any change with your pharmacist or prescriber.
Common questions
Can I take Abemaciclib and Varicella Virus Vaccine, Live together?
Do not receive the live varicella (chickenpox) vaccine while on abemaciclib, because a weakened immune system can let the vaccine virus cause a real, spreading infection. Always clear any vaccine with your oncology team first. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Abemaciclib and Varicella Virus Vaccine, Live interaction?
It is rated contraindicated. These should generally not be used together.
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 Varicella Virus Vaccine, Live interaction managed?
Keep taking your abemaciclib as prescribed and do not stop it on your own. The key here is avoiding the live varicella vaccine while your immune system is suppressed by treatment. Tell any provider offering you a vaccine that you are on abemaciclib (Verzenio) for cancer. Let your oncology team decide on vaccine type and timing, since live vaccines are generally avoided during treatment. Per CDC gu… 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 Varicella 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: VARIVAX(R) intramuscular, subcutaneous injection (refrigerator), varicella virus vaccine live intramuscular, subcutaneous injection (refrigerator). Merck Sharp & Dohme Corp (per FDA), Whitehouse Station, NJ, 2023.
Keep reading about Abemaciclib
Keep reading about Varicella Virus Vaccine, Live
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