The Janssen COVID‑19 Vaccine will be given to you as an injection into the muscle. The Janssen COVID‑19 Vaccine vaccination schedule is a single dose.
In an ongoing clinical trial, the Janssen COVID‑19 Vaccine has been shown to prevent COVID‑19 following a single dose. The duration of protection against COVID‑19 is currently unknown.
Side effects that have been reported with the Janssen COVID-19 Vaccine include:
- Injection site reactions: pain, redness of the skin and swelling
- General side effects: headache, feeling very tired, muscle aches, nausea, and fever
- Swollen lymph nodes
- Unusual feeling in the skin (such as tingling or a crawling feeling) (paresthesia), decreased feeling or sensitivity, especially in the skin (hypoesthesia)
- Persistent ringing in the ears (tinnitus)
- Diarrhea, vomiting
Severe Allergic Reactions
There is a remote chance that the Janssen COVID-19 Vaccine could cause a severe allergic reaction. A severe allergic reaction would usually occur within a few minutes to one hour after getting a dose of the Janssen COVID-19 Vaccine. For this reason, your vaccination provider may ask you to stay at the place where you received your vaccine for monitoring after vaccination. Signs of a severe allergic reaction can include:
- Difficulty breathing
- Swelling of your face and throat,
- A fast heartbeat
- A bad rash all over your body
- Dizziness and weakness
Blood Clots with Low Levels of Platelets
Blood clots involving blood vessels in the brain, lungs, abdomen, and legs along with low levels of platelets (blood cells that help your body stop bleeding), have occurred in some people who have received the Janssen COVID-19 Vaccine. In people who developed these blood clots and low levels of platelets, symptoms began approximately one to two weeks after vaccination. Reporting of these blood clots and low levels of platelets has been highest in females ages 18 through 49 years. The chance of having this occur is remote. You should seek medical attention right away if you have any of the following symptoms after receiving the Janssen COVID-19 Vaccine:
- Shortness of breath
- Chest pain
- Leg swelling
- Persistent abdominal pain
- Severe or persistent headaches or blurred vision
- Easy bruising or tiny blood spots under the skin beyond the site of the injection
These may not be all the possible side effects of the Janssen COVID-19 Vaccine. Serious and unexpected effects may occur. The Janssen COVID-19 Vaccine is still being studied in clinical trials.
Guillain Barré Syndrome
Guillain Barré syndrome (a neurological disorder in which the body’s immune system damages nerve cells, causing muscle weakness and sometimes paralysis) has occurred in some people who have received the Janssen COVID-19 Vaccine. In most of these people, symptoms began within 42 days following receipt of the Janssen COVID-19 Vaccine. The chance of having this occur is very low. You should seek medical attention right away if you develop any of the following symptoms after receiving the Janssen COVID-19 Vaccine:
- Weakness or tingling sensations, especially in the legs or arms, that’s worsening and spreading to other parts of the body
- Difficulty walking
- Difficulty with facial movements, including speaking, chewing, or swallowing
- Double vision or inability to move eyes
- Difficulty with bladder control or bowel function
For more information on the CDC recommendation for use of Johnson & Johnson's Janssen COVID-19 Vaccine, please see the latest update from the CDC.
If you experience a severe allergic reaction, call 9‑1‑1, or go to the nearest hospital.
Call the vaccination provider or your healthcare provider if you have any side effects that bother you or do not go away.
Report vaccine side effects to FDA/CDC Vaccine Adverse Event Reporting System (VAERS). The VAERS toll-free number is 1-800-822-79671-800-822-7967 or report online to https://vaers.hhs.gov/reportevent.html. Please include "Janssen COVID‑19 Vaccine EUA" in the first line of box #18 of the report form.
In addition, you can report side effects to Janssen Biotech, Inc. at the contact information provided below.
US Toll Free: 1-800-565-40081-800-565-4008
US Toll: 1-908-455-99221-908-455-9922
You may also be given an option to enroll in v-safe. V-safe is a new voluntary smartphone-based tool that uses text messaging and web surveys to check in with people who have been vaccinated to identify potential side effects after COVID-19 vaccination. V-safe asks questions that help CDC monitor the safety of COVID-19 vaccines. V-safe also provides live telephone follow-up by CDC if participants report a significant health impact following COVID-19 vaccination. For more information on how to sign up, visit: www.cdc.gov/vsafe
No. The Janssen COVID‑19 Vaccine does not contain SARS-CoV-2 and cannot give you COVID‑19.
The FDA has authorized the emergency use of the Janssen COVID‑19 Vaccine to prevent COVID‑19 in individuals 18 years of age and older under an Emergency Use Authorization (EUA).
You should not get the Janssen COVID‑19 Vaccine if you had a severe allergic reaction to any ingredient of this vaccine.
No. At this time, the provider cannot charge you for a vaccine dose and you cannot be charged an out-of-pocket vaccine administration fee or any other fee if only receiving a COVID-19 vaccination. However, vaccination providers may seek appropriate reimbursement from a program or plan that covers COVID-19 vaccine administration fees for the vaccine recipient (private insurance, Medicare, Medicaid, HRSA COVID-19 Uninsured Program for non-insured recipients).