Abatacept and Smallpox Monkeypox Vaccine: 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
Abatacept
Smallpox Monkeypox Vaccine
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.
Abatacept (Orencia) calms down part of your immune system to help with conditions like rheumatoid arthritis. The smallpox/monkeypox vaccine we're talking about here is a live vaccine, meaning it contains a weakened live virus.
Two things can happen when these are used close together. First, because abatacept quiets your immune response, your body may not build up as much protection from the vaccine, so it may not work as well. Second, there's a theoretical concern about the live virus in the vaccine. That's why live vaccines usually aren't given during abatacept treatment or within about 3 months after stopping it. The good news is your care team can plan the timing so you still get the protection you need.
Interaction: Abatacept, a selective T-cell costimulation modulator, alters cellular immune response and may blunt the immunogenicity of the live smallpox/monkeypox vaccine, reducing vaccine efficacy. A theoretical risk of complications from the live viral component also exists.
- Direction: Reduced vaccine effectiveness (immunosuppression); neither agent is enzyme-metabolized, so this is a pharmacodynamic (immune) interaction.
- Evidence: Probable; no direct clinical data.
- Onset: Unspecified.
- Management: Avoid live vaccines during abatacept therapy and for up to 3 months after discontinuation. Coordinate immunization timing with the prescriber; consider serologic response assessment where relevant.
What happens
Secondary transmission of infection by the live vaccine; reduced effectiveness of immunization
Interaction Deep Dive
While there is no available evidence describing how vaccination behaves in individuals undergoing abatacept therapy, it is advised against giving live vaccines during abatacept treatment or in the 3 months after it. Because the cellular immune response can be modified, abatacept may interfere with the host's defenses against infections. Consequently, the vaccine's effectiveness could be diminished by abatacept. No data exist concerning secondary transmission of infection to abatacept-treated patients from persons who have received live vaccines1.
Why it happens (mechanism)
Altered cellular immune response
How to manage this interaction
Keep taking your abatacept as prescribed, and do not stop it on your own to get vaccinated. Instead, work with your care team on timing.
- Tell your pharmacist and prescriber that you take abatacept before any live vaccine, including the smallpox/monkeypox vaccine, is scheduled.
- Live vaccines are generally not recommended during abatacept treatment or within about 3 months after stopping it.
- Your team may adjust the timing so the vaccine can work as well as possible and give the protection you need.
- Ask whether a non-live alternative or a different schedule fits your situation.
Management is individual — confirm any change with your pharmacist or prescriber.
Common questions
Can I take Abatacept and Smallpox Monkeypox Vaccine together?
Live vaccines like the smallpox/monkeypox vaccine generally shouldn't be given while you're on abatacept or within about 3 months after stopping it, because the vaccine may not work as well. Ask your care team to plan the timing. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Abatacept and Smallpox Monkeypox Vaccine interaction?
It is rated moderate. Can be significant — usually manageable with monitoring.
How quickly could this interaction happen?
The documented onset is "unspecified". The timing of this interaction is not well characterized.
How is the Abatacept and Smallpox Monkeypox Vaccine interaction managed?
Keep taking your abatacept as prescribed, and do not stop it on your own to get vaccinated. Instead, work with your care team on timing. Tell your pharmacist and prescriber that you take abatacept before any live vaccine, including the smallpox/monkeypox vaccine, is scheduled. Live vaccines are generally not recommended during abatacept treatment or within about 3 months after stopping it. Your te… 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 Abatacept or Smallpox Monkeypox Vaccine 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 anything you'd monitor while I'm on both?
References (1)
- Product Information: ORENCIA(R) IV powder, abatacept IV powder. Bristol-Myers Squibb, Princeton, NJ, 2008.
Keep reading about Abatacept
Keep reading about Smallpox Monkeypox Vaccine
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