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Generic Name: Japanese Encephalitis Virus Vaccine (Inactivated) (jap a NEESE en sef a LYE tis VYE rus vak SEEN, in ak ti VAY ted)
Brand Name: Ixiaro

Medically reviewed by Last updated on Nov 16, 2020.

Uses of Ixiaro:

  • It is used to prevent disease caused by a certain virus (Japanese encephalitis virus).

What do I need to tell my doctor BEFORE I take Ixiaro?

  • If you have an allergy to any part of Ixiaro (japanese encephalitis virus vaccine (inactivated)).
  • If you are allergic to Ixiaro (japanese encephalitis virus vaccine (inactivated)); any part of Ixiaro (japanese encephalitis virus vaccine (inactivated)); or any other drugs, foods, or substances. Tell your doctor about the allergy and what signs you had.

This medicine may interact with other drugs or health problems.

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 Ixiaro (japanese encephalitis virus vaccine (inactivated)) 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 Ixiaro?

  • Tell all of your health care providers that you take Ixiaro (japanese encephalitis virus vaccine (inactivated)). This includes your doctors, nurses, pharmacists, and dentists.
  • This medicine may not protect all people who use it. Talk with the doctor.
  • This medicine is a vaccine with a virus that is not active. It cannot cause the disease.
  • Tell your doctor if you are pregnant or plan on getting pregnant. You will need to talk about the benefits and risks of using Ixiaro (japanese encephalitis virus vaccine (inactivated)) while you are pregnant.
  • Tell your doctor if you are breast-feeding. You will need to talk about any risks to your baby.

How is this medicine (Ixiaro) best taken?

Use Ixiaro (japanese encephalitis virus vaccine (inactivated)) 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 need to have 2 doses of this vaccine. Be sure to get both doses as your doctor has told you.

What do I do if I miss a dose?

  • Call your doctor to find out what to do.

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.
  • Dizziness or passing out.
  • Feeling very tired or weak.
  • A fast heartbeat.

What are some other side effects of Ixiaro?

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:

For all patients taking Ixiaro (japanese encephalitis virus vaccine (inactivated)):

  • Headache.
  • Muscle or joint pain.
  • Pain where the shot was given.
  • Irritation where the shot is given.
  • Feeling tired or weak.
  • Flu-like signs.
  • Nose or throat irritation.
  • Upset stomach.
  • Not hungry.

Young children:

  • Mild fever.
  • Feeling irritable.
  • Diarrhea.
  • Throwing up.

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 the FDA at 1-800-332-1088. You may also report side effects at

If OVERDOSE is suspected:

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.

How do I store and/or throw out Ixiaro?

  • If you need to store Ixiaro (japanese encephalitis virus vaccine (inactivated)) at home, talk with your doctor, nurse, or pharmacist about how to store it.

Consumer information use

  • 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. Check with your pharmacist. If you have any questions about Ixiaro (japanese encephalitis virus vaccine (inactivated)), 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.

Further information

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.

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