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Summary Reports

Summary Basis of Decision
Regulatory Decision Summary
Summary safety review - Janssen COVID-19 Vaccine - Assessing the Potential Risk of Thrombosis in combination with Thrombocytopenia
Interim Order Respecting the Importation, Sale and Advertising of Drugs for Use in Relation to COVID-19
Product Monograph

Consumer Information

This information was provided by the drug’s manufacturer when this drug product was approved for sale in Canada. It is designed for consumers and care givers. It is a summary of information about the drug and will not tell you everything about the drug. Contact your doctor or pharmacist if you have any questions about the drug.

What the medication is used for

Janssen COVID-19 Vaccine is a vaccine used to prevent COVID-19 disease caused by the SARS-CoV-2 virus. Janssen COVID-19 Vaccine can be given to protect people aged 18 years and older.

What it does

Janssen COVID-19 Vaccine uses a recombinant, replication-incompetent human adenovirus type 26 vector to stimulate the body’s natural defenses (immune system) and produce its own protection (antibodies) against the virus.

The vaccine is given as a single dose, by injection with a needle, usually in the upper arm.

You cannot get COVID-19 from this vaccine.

As with any vaccine, Janssen COVID-19 Vaccine may not fully protect all those who receive it. Even after you have had the vaccine, continue to follow the recommendations of local public health officials to prevent spread of COVID-19.

When it should not be used

Do not use Janssen COVID-19 Vaccine if:

  • you have previously had a severe allergic reaction to any of the active substance(s) or any of the other ingredients of Janssen COVID-19 Vaccine
  • you have ever had a severe allergic reaction after a dose of any other ‘adenovirus-based vaccine’
  • you currently have symptoms that could be due to COVID-19. Talk to your healthcare professional about your symptoms and getting a COVID-19 test. Your healthcare professional will advise you when you are able to receive the vaccine.
What the medicinal ingredient is

Medicinal ingredients: recombinant, replication-incompetent adenovirus type 26 (Ad26) vectored COVID-19 vaccine encoding the SARS-CoV-2 Spike (S) protein 5 × 1010 virus particles (VP)*

* Produced in the PER.C6® TetR Cell Line and by recombinant DNA technology.

What the non-medicinal ingredients are

Non-medicinal ingredients:

  • 2-hydroxypropyl-β-cyclodextrin (HBCD)
  • Citric acid monohydrate
  • Ethanol
  • Hydrochloric acid
  • Polysorbate-80
  • Sodium chloride
  • Sodium hydroxide
  • Trisodium citrate dihydrate
  • Water for injection
What dosage form it comes in

Colourless to slightly yellow, clear to very opalescent suspension provided in a multiple dose vial of 5 doses of 0.5 mL, each dose containing 5 × 1010 virus particles of adenovirus type 26 (Ad26) vectored COVID-19 vaccine encoding the SARS-CoV-2 Spike (S) protein.

Warnings and precautions

To help avoid side effects and ensure proper use, talk to your healthcare professional before you take Janssen COVID-19 Vaccine. Talk about any health conditions or problems you may have, including if you:

  • Have ever had a severe allergic reaction after any type of vaccine
  • Have had a history of venous sinus thrombosis in the brain with low platelets (thrombocytopenia) or a history of heparin-induced thrombocytopenia (HIT)
  • Have a weakened immune system due to a medical condition or are on a medicine that affects your immune system
  • Are pregnant, think you may be pregnant or plan to become pregnant
  • Are breastfeeding or plan to breastfeed
  • Have a bleeding problem, bruise easily or use a blood thinning medication
  • Have a high fever or severe infection
  • Have any serious illness

Do not drive or use machines if you are feeling unwell after vaccination.

If any of the above apply to you (or you are not sure), talk to your doctor, pharmacist or nurse before you are given Janssen COVID-19 Vaccine.

Tell your healthcare professional about all the medicines you take, including any drugs, vitamins, minerals, natural supplements or alternative medicines.

Interactions with this medication

There is no information on the use of Janssen COVID-19 Vaccine with other vaccines. Tell your healthcare professional if you have recently taken or might take any other vaccine.

Proper use of this medication

How Janssen COVID-19 Vaccine is given:

  • Your doctor, pharmacist, or nurse will inject the vaccine into a muscle (intramuscular injection) - usually in your upper arm.
  • During and after each injection of the vaccine, your doctor, pharmacist or nurse will watch over you for at least 15 minutes to monitor for signs of an allergic reaction.

Usual dose:

A single dose (0.5 mL) of Janssen COVID-19 Vaccine should be administered.


In the event of suspected overdose with Janssen COVID-19 Vaccine, contact your regional poison control centre.
Side effects and what to do about them

Like all vaccines, Janssen COVID-19 Vaccine can cause side effects. In clinical studies with the vaccine, most of the side effects, happened within 2 days of getting the injection, were mild to moderate in intensity, and resolved within 1-2 days.

The following side effects may happen with this vaccine:

Very common (may affect more than 1 in 10 people):

  • headache
  • nausea
  • muscle aches
  • pain at injection site
  • feeling very tired (fatigue)

Common (may affect up to 1 in 10 people):

  • fever
  • redness at injection site
  • swelling at injection site
  • chills
  • joint pain

Uncommon (may affect up to 1 in 100 people):

  • rash
  • muscle weakness
  • arm or leg pain
  • feeling weak
  • feeling generally unwell

Rare (may affect up to 1 in 1000 people):

  • allergic reaction, including hives

Should you develop any serious symptoms or symptoms that could be an allergic reaction, seek medical attention immediately. Symptoms of an allergic reaction include:

  • hives (bumps on the skin that are often very itchy)
  • swelling of the face, tongue or throat
  • difficulty breathing

If you experience a severe allergic reaction, call 9-1-1, or go to the nearest hospital.

A combination of blood clots and low level of platelets, in some cases together with bleeding, has been observed very rarely in unusual locations (e.g., brain, liver) following vaccination with Janssen COVID-19 Vaccine. Seek medical attention right away if any of the following symptoms occur within the first month following vaccination:

  • new severe headaches, worsening or persistent headaches; blurred vision, confusion or seizures
  • shortness of breath, chest pain, leg swelling, leg pain or persistent abdominal pain
  • unusual skin bruising or pinpoint round spots under the skin beyond the site of vaccination

These may not be all the possible side effects of Janssen COVID-19 Vaccine. If you experience any side effects not listed here, tell your healthcare professional.

Tell your doctor, pharmacist or nurse if you have any side effects that bother you, interfere with your daily activities, or do not go away.

How to store

Your doctor, pharmacist or nurse is responsible for storing this vaccine and disposing of any unused product correctly.

Keep Janssen COVID-19 Vaccine out of reach and sight of children.

Reporting side effects

Reporting Suspected Side Effects for Vaccines

For the general public: Should you experience a side effect following immunization, please report it to your healthcare professional.

Should you require information related to the management of the side effect, please contact your healthcare professional. The Public Health Agency of Canada, Health Canada and Janssen Inc. cannot provide medical advice.

For healthcare professionals: If a patient experiences a side effect following immunization, please complete the Adverse Events Following Immunization (AEFI) Form appropriate for your province/territory ( and send it to your local Health Unit.

More information

If you want more information about Janssen COVID-19 Vaccine:

This leaflet was prepared by Janssen Inc.

Last Revised: April 23, 2021

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