This vaccine is used to help protect people who are at high risk of smallpox or monkeypox infection. Smallpox and monkeypox are caused by a certain type of virus (orthopox virus). People who are at high risk may include certain lab, health care, or public health workers, and people who have been exposed to someone infected with one of these viruses. This vaccine works by boosting the body's natural defense (immunity) against orthopox viruses.This vaccine is made using weakened live virus and cannot cause orthopox infection. It can help prevent infection with some types of orthopox viruses including smallpox, monkeypox, and vaccinia. As with any vaccine, it may not fully protect everyone who receives it.

How to use Jynneos(PF)(National Stockpile) 0.5X To 3.95X 10Exp8/0.5Ml Subcut Susp Smallpox Vaccine

Read all vaccine information available from your health care professional before receiving the vaccine. If you have any questions, ask your health care professional.

This vaccine is given by injection under the skin by a health care professional, usually as 2 doses, given 4 weeks apart. The injection is usually given in the upper arm. People who have received one dose in the past might only need one dose. Closely follow the vaccination schedule provided by your health care professional. Keep all scheduled medical appointments. It may be helpful to mark a calendar as a reminder.

This vaccine may be given at the same time as other vaccines.

Side Effects

Redness, soreness, swelling, and itching at the injection site may occur. Tiredness, headache, and muscle pain may also occur. If any of these effects last or get worse, tell your health care professional promptly.

Rarely, some people have symptoms such as fainting, dizziness, vision changes, or ringing in the ears just after getting a vaccine injection. Tell your health care professional right away if you have any of these symptoms. Sitting or lying down may help, since these symptoms usually don't last long.

Remember that this medication has been prescribed because your health care professional has judged that the benefit to you is greater than the risk of side effects. Many people using this medication do not have serious side effects.

A very serious allergic reaction to this drug is rare. However, get medical help right away if you notice any symptoms of a serious allergic reaction, including: rash, itching/swelling (especially of the face/tongue/throat), severe dizziness, trouble breathing.

This is not a complete list of possible side effects. If you notice other effects not listed above, contact your health care professional.

Contact the doctor for medical advice about side effects. The following numbers do not provide medical advice, but in the US you may report side effects to the Vaccine Adverse Event Reporting System (VAERS) at 1-800-822-7967. In Canada, you may call the Vaccine Safety Section at Public Health Agency of Canada at 1-866-844-0018.


Before you receive this vaccine, tell the health care professional if you are allergic to it; or if you have any other allergies. This product may contain inactive ingredients, which can cause allergic reactions or other problems. Talk to your pharmacist for more details.

Before receiving this vaccine, tell your health care professional your medical history, especially of: current fever/illness, immune system disorders (such as due to cancer or radiation treatment), certain heart problems (such as myocarditis, pericarditis).

During pregnancy, this vaccine should be received only when clearly needed. Discuss the risks and benefits with your health care professional.

It is unknown if this vaccine passes into breast milk. Consult your health care professional before breastfeeding.


Drug interactions may change how your medications work or increase your risk for serious side effects. This document does not contain all possible drug interactions. Keep a list of all the products you use (including prescription/nonprescription drugs and herbal products) and share it with your health care professional. Do not start, stop, or change the dosage of any medicines without your doctor's approval.

Some products that may interact with this drug are: drugs that weaken the immune system (including cyclosporine, tacrolimus, cancer chemotherapy, corticosteroids such as prednisone).

Does Jynneos(PF)(National Stockpile) 0.5X To 3.95X 10Exp8/0.5Ml Subcut Susp Smallpox Vaccine interact with other drugs you are taking?
Enter your medication into the WebMD interaction checker


Not applicable.

Notes Notes

Keep all regular medical and lab appointments.

Missed Dose Missed Dose

It is important that you get each vaccination as scheduled. Ask when you should get each dose, and make a note on your calendar. If you miss a dose, ask your health care professional right away for a new dosing schedule.

Storage Storage

Not applicable. This vaccine is given in a hospital or clinic and will not be stored at home.


Drug Survey

Are you currently using Jynneos(PF)(National Stockpile) 0.5X To 3.95X 10Exp8/0.5Ml Subcut Susp Smallpox Vaccine?

This survey is being conducted by the WebMD marketing sciences department.

Selected from data included with permission and copyrighted by First Databank, Inc. This copyrighted material has been downloaded from a licensed data provider and is not for distribution, except as may be authorized by the applicable terms of use.

CONDITIONS OF USE: The information in this database is intended to supplement, not substitute for, the expertise and judgment of healthcare professionals. The information is not intended to cover all possible uses, directions, precautions, drug interactions or adverse effects, nor should it be construed to indicate that use of a particular drug is safe, appropriate or effective for you or anyone else. A healthcare professional should be consulted before taking any drug, changing any diet or commencing or discontinuing any course of treatment.