What should I expect after my cat receives vaccinations?


Your cat received vaccinations today. All injections were given subcutaneously (under the skin). After receiving a vaccination, it is possible for your cat to experience mild side effects. Side effects can start within hours of receiving the vaccine and generally do not last more than one day. Side effects you may see:

  • Mild swelling and/or mild pain at the injection site
  • Mild fever
  • Decreased appetite
  • Mild lethargy

If the side effects seem severe, or continue for more than 24 hours, please call us right away. More serious but rare side effects can be seen shortly after receiving a vaccination. Signs can include difficulty breathing, facial swelling, itchiness, vomiting, diarrhea or collapse. These reactions can be life threatening and require immediate veterinary attention.

Some cats will develop a small, firm nodule at the injection site. If you notice this, please call us to discuss follow up care. Most nodules will resolve within three months, but if it is getting bigger or persists you should contact our hospital for advice.

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