COVID-19 Vaccine (Adenovirus Vector)

Adult Medication

This information from Lexicomp® explains what you need to know about this medication, including what it’s used for, how to take it, its side effects, and when to call your healthcare provider.

Brand Names: US

Janssen COVID-19 Vaccine

Brand Names: Canada

AstraZeneca COVID-19 Vaccine; Covishield; Janssen COVID-19 Vaccine

What is this drug used for?

  • It is used to prevent COVID-19.

What do I need to tell my doctor BEFORE I take this drug?

  • If you are allergic to this drug; any part of this drug (including polysorbate 80); or any other drugs, foods, or substances (including polyethylene glycol). Tell your doctor about the allergy and what signs you had.
  • If you have COVID-19, if you have any symptoms that could be from COVID-19, if you are waiting to find out COVID-19 test results, or if you recently had COVID-19.
  • If you have an illness with a fever.
  • If you have bleeding problems.
  • If you are taking a blood thinner.
  • If you have had a different COVID-19 vaccine.
  • If you have been exposed to someone who has COVID-19 within the past 14 days.
  • If you have been treated for COVID-19 infection with other drugs or plasma in the past 90 days.
  • If you have had another vaccine within the past 14 days or are scheduled to get one within the next 14 days.

This is not a list of all drugs or health problems that interact with this drug.

Tell your doctor and pharmacist about all of your drugs (prescription or OTC, natural products, vitamins) and health problems. You must check to make sure that it is safe for you to take this drug with all of your drugs and health problems. Do not start, stop, or change the dose of any drug without checking with your doctor.

What are some things I need to know or do while I take this drug?

  • Tell all of your health care providers that you take this drug. This includes your doctors, nurses, pharmacists, and dentists.
  • This vaccine cannot cause COVID-19.
  • Some products are given as 1 dose, while others need to be given as 2 doses. If you are not sure, talk with your doctor or pharmacist.
  • Like all vaccines, this vaccine may not fully protect all people who get it. If you have questions, talk with the doctor.
  • If you have side effects after a dose, acetaminophen or nonsteroidal anti-inflammatory drugs (NSAIDs) like ibuprofen or naproxen may help.
  • After getting the vaccine, continue to do things that prevent the spread of COVID-19 as recommended by local public health officials. These include washing hands often, wearing a mask, staying at least 6 feet away from other people, and avoiding crowds.
  • If you have a weak immune system or take drugs that weaken the immune system, talk with your doctor. This vaccine may not work as well.
  • Rarely, cases of Bell’s palsy happened in studies. It is not known if this vaccine may be the cause. Tell your doctor if you have ever had Bell’s palsy. Call your doctor right away if you have signs like weak or drooping muscles on one side of your face.
  • Blood clots with low blood platelet levels (sometimes with bleeding) have happened very rarely in people who got some types of this vaccine. If you have questions, talk with the doctor.
  • It is not yet known if this vaccine may affect some tuberculosis (TB) tests. If you need to be tested for TB, talk with your doctor.
  • Tell your doctor if you are pregnant, plan on getting pregnant, or are breast-feeding. You will need to talk about the benefits and risks to you and the baby.

What are some side effects that I need to call my doctor about right away?

WARNING/CAUTION: Even though it may be rare, some people may have very bad and sometimes deadly side effects when taking a drug. Tell your doctor or get medical help right away if you have any of the following signs or symptoms that may be related to a very bad side effect:

  • Signs of an allergic reaction, like rash; hives; itching; red, swollen, blistered, or peeling skin with or without fever; wheezing; tightness in the chest or throat; trouble breathing, swallowing, or talking; unusual hoarseness; or swelling of the mouth, face, lips, tongue, or throat.
  • Fast heartbeat, dizziness, passing out, or weakness. These may be other signs of an allergic reaction or other type of reaction.
  • Very bad belly pain.
  • Chest pain or pressure.
  • Coughing up blood.
  • Shortness of breath.
  • Swelling, warmth, numbness, change of color, or pain in a leg or arm.
  • Very bad headache.
  • Blurred eyesight.
  • Bruising or pinpoint round spots on the skin away from the injection site a few days or more after getting the vaccine.

What are some other side effects of this drug?

All drugs may cause side effects. However, many people have no side effects or only have minor side effects. Call your doctor or get medical help if any of these side effects or any other side effects bother you or do not go away:

  • Pain, redness, or swelling where the injection was given, headache, muscle or joint pain, fever of 100.4°F (38°C) or higher, chills, upset stomach, or feeling tired or unwell. Most side effects have been mild. Most of the time these went away within 1 to 2 days after the injection.

These are not all of the side effects that may occur. If you have questions about side effects, call your doctor. Call your doctor for medical advice about side effects.

You may report side effects to your national health agency.

Report side effects to the FDA/CDC Vaccine Adverse Event Reporting System (VAERS) at https://vaers.hhs.gov/reportevent.html or by calling 1-800-822-7967. There is also a smartphone tool called V-safe that may be used to check how you are doing and to report side effects. This can be found at https://vsafe.cdc.gov. If you need help with V-safe, call 1-800-232-4636.

How is this drug best taken?

Use this drug as ordered by your doctor. Read all information given to you. Follow all instructions closely.

  • It is given as a shot into a muscle.
  • You will be watched closely while you receive this drug and for some time after your dose. Talk with your doctor.

What do I do if I miss a dose?

  • Call your doctor to find out what to do.

How do I store and/or throw out this drug?

  • This injection will be given to you in a healthcare setting. You will not store it at home.

General drug facts

  • If your symptoms or health problems do not get better or if they become worse, call your doctor.
  • Do not share your drugs with others and do not take anyone else’s drugs.
  • Keep all drugs in a safe place. Keep all drugs out of the reach of children and pets.
  • Throw away unused or expired drugs. Do not flush down a toilet or pour down a drain unless you are told to do so. Check with your pharmacist if you have questions about the best way to throw out drugs. There may be drug take-back programs in your area.
  • Some drugs may have another patient information leaflet. If you have any questions about this drug, please talk with your doctor, nurse, pharmacist, or other health care provider.
  • Some drugs may have another patient information leaflet. Check with your pharmacist. If you have any questions about this drug, please talk with your doctor, nurse, pharmacist, or other health care provider.
  • If you think there has been an overdose, call your poison control center or get medical care right away. Be ready to tell or show what was taken, how much, and when it happened.

Consumer Information Use and Disclaimer

This information should not be used to decide whether or not to take this medicine or any other medicine. Only the healthcare provider has the knowledge and training to decide which medicines are right for a specific patient. This information does not endorse any medicine as safe, effective, or approved for treating any patient or health condition. This is only a brief summary of general information about this medicine. It does NOT include all information about the possible uses, directions, warnings, precautions, interactions, adverse effects, or risks that may apply to this medicine. This information is not specific medical advice and does not replace information you receive from the healthcare provider. You must talk with the healthcare provider for complete information about the risks and benefits of using this medicine.

Last Reviewed Date

2021-04-09

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Last Updated