What is YF-Vax: Uses, Warnings & Interactions

Updated May 14, 2025  •  Published Dec 31, 2020

YF-Vax overview

BRAND NAMES:

  • YF-VAX

Generic Names:

  • Yf-Vax

Uses:

  • Prevents yellow fever.

Therapeutic Classes:

  • Vaccine

Forms:

  • Injectable

How it’s taken:

  • By injection

What is YF-Vax used for?

What form(s) does YF-Vax come in

  • Injectable

What are common YF-Vax doses?

  • Injectable

How to take YF-Vax

  • Injection routeYour doctor will prescribe your exact dose and tell you how often it should be given. This medicine is given as a shot under your skin.

  • Injection routeA nurse or other health provider will give you this medicine.

  • A booster dose of the vaccine is recommended every 10 years for patients who are at continuous risk of exposure to the yellow fever virus, and is required by his or her doctor.

  • Injection routeA nurse or other health provider will give you this medicine.

  • Injection routeYour doctor will prescribe your exact dose and tell you how often it should be given. This medicine is given as a shot under your skin.

  • A booster dose of the vaccine is recommended every 10 years for patients who are at continuous risk of exposure to the yellow fever virus, and is required by his or her doctor.

What to do if you miss a dose of YF-Vax

YF-Vax contraindications

  • You should not receive this vaccine if you have had an allergic reaction to eggs, egg products, chicken proteins, or gelatin. This vaccine should not be given to infants younger than 9 months of age. You should not receive this vaccine shot if you have a serious illness with fever or diseases that weaken your immune system (such as AIDS, cancer, leukemia, lymphoma, or thymic disease). Do not breastfeed while you are using this medicine.

YF-Vax warnings

  • Make sure your doctor knows if you are pregnant, or have any medical problems.

  • This vaccine may cause a serious type of allergic reaction called anaphylaxis. Anaphylaxis can be life-threatening and requires immediate medical attention. Tell your doctor right away if you or your child have a rash, itching, swelling of the tongue and throat, or trouble breathing after you receive the vaccine.

  • Side effects from this vaccine could occur up to 30 days after you receive the shot. Be sure to tell your doctor about any serious side effects that occur during that time.

  • Yellow fever vaccine may cause a serious side effect called neurotropic disease or post-vaccinal encephalitis. Check with your doctor right away if you or your child have confusion, irritability, headache, seizures, stiff neck, or vomiting.

  • This vaccine may cause serious allergic reactions affecting multiple body organs (e.g., liver or kidney). Check with your doctor right away if you or your child have the following symptoms: fever, dark urine, headache, rash, stomach pain, unusual tiredness, or yellow eyes or skin.

  • Since the vaccine may not protect everyone completely, it is very important that you use precautions to reduce your chance of mosquito bites. These include using insect repellents and mosquito nets, wearing protective clothing, and staying indoors during twilight and after dark.

  • The stopper of the vial contains dry natural rubber (a derivative of latex), which may cause allergic reactions in people who are sensitive to latex. Tell your doctor if you have a latex allergy before you start receiving this vaccine.

  • Your doctor will check your progress and the effects of this medicine at regular visits. Keep all appointments.

YF-Vax interactions

  • Make sure your doctor knows if you are receiving a treatment or using a medicine that causes a weak immune system. This may include a steroid medicine (such as dexamethasone, prednisolone, prednisone, or Medrol®), cancer medicines, or radiation treatment.

  • This medicine may interfere with vaccines. Ask your doctor before you get a flu shot or any other vaccines.

  • Side effects from this vaccine could occur up to 30 days after you receive the shot. Be sure to tell your doctor about any serious side effects that occur during that time.

  • Yellow fever vaccine may cause a serious side effect called neurotropic disease or post-vaccinal encephalitis. Check with your doctor right away if you or your child have confusion, irritability, headache, seizures, stiff neck, or vomiting.

  • This vaccine may cause serious allergic reactions affecting multiple body organs (e.g., liver or kidney). Check with your doctor right away if you or your child have the following symptoms: fever, dark urine, headache, rash, stomach pain, unusual tiredness, or yellow eyes or skin.

  • Since the vaccine may not protect everyone completely, it is very important that you use precautions to reduce your chance of mosquito bites. These include using insect repellents and mosquito nets, wearing protective clothing, and staying indoors during twilight and after dark.

  • The stopper of the vial contains dry natural rubber (a derivative of latex), which may cause allergic reactions in people who are sensitive to latex. Tell your doctor if you have a latex allergy before you start receiving this vaccine.

  • Your doctor will check your progress and the effects of this medicine at regular visits. Keep all appointments.

YF-Vax side effects

Serious Side Effects

  • Allergic reaction: Itching or hives, swelling in your face or hands, swelling or tingling in your mouth or throat, chest tightness, trouble breathing

  • Confusion, extreme sleepiness, or changes in personality or behavior.

  • Shallow breathing.

  • Yellowing of your skin or the whites of your eyes.

  • Fever, severe headache, stiffness in your neck, vomiting, or seizures.

  • Decrease in how much and how often you urinate.

  • Unusual bleeding, bruising, or weakness.

Less Serious Side Effects

  • Redness, pain, swelling, itching, blistering, or rash where the shot is given.

  • Mild fever, headache, muscle pain, or weakness.

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