Is it safe to get a flu shot on methotrexate?
Yes, people taking methotrexate can and should get an inactivated flu vaccine, as recommended by health authorities like the CDC and rheumatology guidelines. Methotrexate suppresses the immune system moderately, but it does not contraindicate inactivated vaccines like the standard flu shot (e.g., Fluzone or Fluarix). These vaccines use killed virus and cannot cause flu.[1][2]
What do doctors and guidelines say?
The American College of Rheumatology (ACR) and CDC advise continuing methotrexate without interruption for inactivated flu shots. Vaccination protects against severe flu, which poses higher risks for immunocompromised patients on methotrexate for conditions like rheumatoid arthritis. Studies show antibody responses are reduced but still provide benefit—response rates around 50-70% vs. 90% in healthy adults.[3][4]
Live vs. inactivated flu vaccines—which can you get?
Avoid live attenuated flu vaccines (e.g., nasal spray FluMist) while on methotrexate, as they carry live virus and risk infection in immunocompromised people. Stick to injected inactivated or recombinant versions, available at most pharmacies and clinics.[1][5]
Does methotrexate affect vaccine effectiveness?
It lowers immune response, so protection may be weaker. Doctors often test antibody levels post-vaccination or recommend higher-dose vaccines like Fluzone High-Dose for better results in older or immunosuppressed patients.[3][6]
Timing and precautions
Get the flu shot anytime during flu season (October-March), even mid-methotrexate dose. No need to pause the drug—guidelines confirm safety. Inform your doctor or pharmacist about methotrexate; they may monitor for rare reactions like increased soreness.[2][4]
Other vaccines on methotrexate
Inactivated vaccines like pneumococcal (Prevnar), shingles (Shingrix), and COVID-19 are safe and encouraged. Live vaccines (e.g., oral polio, yellow fever) require pausing methotrexate 1-3 months beforehand.[7]
When to talk to your doctor
Consult if you have severe immunosuppression, active infection, or other drugs like high-dose steroids/JAK inhibitors, which could change advice. Rheumatology specialists tailor plans based on your methotrexate dose (typically 7.5-25 mg/week).[4][8]
Sources:
[1] CDC: Flu Vaccines for Immunocompromised
[2] ACR: Vaccinations in Adults with Rheumatic Diseases
[3] PubMed: Vaccine Response in Methotrexate Users
[4] UpToDate: Vaccinations in Immunosuppressed Patients
[5] FDA: Flu Vaccine Types
[6] NEJM: High-Dose Flu Vaccine Efficacy
[7] IDSA: Live Vaccines Guidelines
[8] Arthritis Foundation: Methotrexate and Vaccines