Janssen COVID-19 Vaccine Side Effects

Generic name: sars-cov-2 (covid-19) ad26 vaccine, recombinant

Medically reviewed by Drugs.com. Last updated on Apr 17, 2024.

Note: This document provides detailed information about Janssen COVID-19 Vaccine Side Effects associated with sars-cov-2 (covid-19) ad26 vaccine, recombinant. Some dosage forms listed on this page may not apply specifically to the brand name Janssen COVID-19 Vaccine.

Applies to sars-cov-2 (covid-19) ad26 vaccine, recombinant: intramuscular suspension.

Important warnings This medicine can cause some serious health issues

Becoming infected with COVID-19 is much more dangerous to your health than receiving this vaccine.

Get emergency medical help if you have signs of an allergic reaction: hives; dizziness, weakness, fast heartbeats; difficult breathing; swelling of your face, lips, tongue, or throat.

An allergic reaction is more likely to occur within a few minutes to 1 hour after you receive the vaccine. You will be treated quickly if you have a reaction.

Becoming infected with COVID-19 is much more dangerous to your health than receiving this vaccine.

Some people had blood clots 1 to 2 weeks after receiving this vaccine. Seek medical attention right away if you have:

• bruising or tiny red spots under your skin;

• severe headaches or blurred vision;

• chest pain, shortness of breath; or

• stomach pain, leg pain or swelling.

Some people receiving this vaccine had nervous system problems within 42 days after receiving this vaccine, but the risk of this side effect is very low. Seek medical attention right away if you have:

• weakness or tingling;

• trouble speaking or swallowing;

• problems with balance or eye movement; or

• loss of bladder or bowel control.

Capillary leak syndrome is a rare but serious side effect. Call your doctor right away if you have signs of this condition: stuffy or runny nose followed by tiredness, thirst, decreased urination, trouble breathing, and sudden swelling or weight gain.

Not all possible side effects are known. Common side effects may include:

• fever;

• pain, redness, or swelling where the shot was given;

• nausea;

• headache, muscle pain; or

• feeling tired.

Other side effects, mild or serious, may occur with more widespread use of COVID-19 vaccine.

This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects.

You may also use a smartphone-based program called V-safe to communicate with the Centers for Disease Control and Prevention (CDC) about any health problems you have after receiving a COVID-19 vaccine: www.cdc.gov/vsafe.

Further information

Janssen COVID-19 Vaccine 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.

Note: Medication side effects may be underreported. If you are experiencing side effects that are not listed, submit a report to the FDA by following this guide.

Medical Disclaimer