This vaccine is used to help prevent yellow fever. Yellow fever is an infection that is spread by mosquitos. This vaccine contains live viruses that have been weakened. It works by increasing the body's natural defense (immunity) against the virus.

This vaccine is recommended for people who live in or are traveling to areas where the infection is common (such as Africa, Central/South America) and those who work with the virus in a lab.

Vaccines may not fully protect everyone who receives them.

This vaccine is not approved for use by children younger than 9 months due to an increased risk of side effects (such as seizures).

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. It is given in the upper arm for adults or in the thigh or upper arm for children.

This vaccine should be given as a single injection at least 10 days before possible exposure to yellow fever. It may be given again every 10 years if needed.

Pain/redness/swelling at the injection site, headache, or muscle pain may 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 vaccine 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 vaccine do not have serious side effects.

Get medical help right away if you have any very serious side effects, including:

• signs of swelling of the brain (such as seizures, confusion, stiff/painful neck, fever)
• signs of liver disease (such as nausea/vomiting that doesn't stop, loss of appetite, stomach/abdominal pain, yellowing eyes/skin, dark urine)

A very serious allergic reaction to this vaccine 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 health care professional 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 to eggs; or if you have any other allergies. This product may contain inactive ingredients, which can cause allergic reactions or other problems. Talk to your health care professional for more details.

Before receiving this vaccine, tell your health care professional your medical history, especially of:

• current fever/illness
• vaccination history (including previous reactions to any vaccines)
• immune system disorders (such as due to HIV infection, certain cancers such as leukemia/lymphoma, cancer or radiation treatment)
• a certain muscle/nerve disease (myasthenia gravis)

Older adults may be more sensitive to the side effects of this vaccine.

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

This vaccine passes into breast milk and may harm a nursing infant who is younger than 9 months. Breastfeeding is not recommended after receiving this vaccine if the nursing infant is younger than 9 months. Consult your doctor 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 vaccine are:

• drugs that weaken the immune system (including cyclosporine, tacrolimus, cancer chemotherapy, corticosteroids such as prednisone)

Not applicable.

Keep all medical and lab appointments.

Keep vaccine records for yourself and your children and provide them to the health care professionals to prevent unnecessary re-vaccinations.

Not applicable.

Store in the refrigerator. Do not freeze. Keep all medications away from children and pets.

Do not flush medications down the toilet or pour them into a drain unless instructed to do so. Properly discard this product when it is expired or no longer needed. Consult your pharmacist or local waste disposal company.