Skip to main content

Jynneos Side Effects

Generic name: smallpox and mpox vaccine

Medically reviewed by Drugs.com. Last updated on Aug 3, 2024.

Note: This document provides detailed information about Jynneos Side Effects associated with smallpox and mpox vaccine. Some dosage forms listed on this page may not apply specifically to the brand name Jynneos.

Applies to smallpox and mpox vaccine: suspension.

Serious side effects of Jynneos

Along with its needed effects, smallpox and mpox vaccine (the active ingredient contained in Jynneos) may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.

Check with your doctor or nurse immediately if any of the following side effects occur while taking smallpox and mpox vaccine:

More common side effects

  • chills

Less common side effects

Incidence not known

  • chest tightness
  • cough
  • difficulty with swallowing
  • dizziness
  • fainting
  • fast heartbeat
  • hives, itching, rash
  • puffiness or swelling of the eyelids or around the eyes, face, lips, or tongue
  • trouble breathing
  • unusual tiredness or weakness

Other side effects of Jynneos

Some side effects of smallpox and mpox vaccine may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects.

Check with your health care professional if any of the following side effects continue or are bothersome or if you have any questions about them:

More common side effects

  • bleeding, blistering, burning, coldness, discoloration of the skin, feeling of pressure, hives, infection, inflammation, itching, lumps, numbness, pain, rash, redness, scarring, soreness, stinging, swelling, tenderness, tingling, ulceration, or warmth at the injection site
  • headache
  • muscle pain
  • nausea

For healthcare professionals

Applies to smallpox and mpox vaccine: injectable suspension, subcutaneous suspension.

General adverse events

There were similar proportion of subjects reporting local or systemic reactions of any severity after the second dose, compared to the first dose, except for injection site pain which was more common following dose 1 (79% vs 69%).[Ref]

Cardiovascular

None of the reported cardiac AESIs causally related to vaccination were considered serious.[Ref]

Gastrointestinal

Local

Musculoskeletal

Nervous system

Other

References

1. (2021) "Product Information. Jynneos (smallpox and monkeypox vaccine)." Bavarian Nordic, Inc.

2. FDA. Food and Drug Admnistration (2022) Jynneos Health Care Provider Fact Sheet (Emergency Use Authorization) https://www.fda.gov/media/160774/download

Further information

Jynneos side effects can vary depending on the individual. Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.

Some side effects may not be reported. You may report them to the FDA.