Many medications can cause side effects. A side effect is an unwanted response to a medication when it is taken in normal doses. Side effects can be mild or severe, temporary or permanent.

The side effects listed below are not experienced by everyone who takes Varivax III (Varicella-vaccine-live). If you are concerned about side effects, discuss the risks and benefits of Varivax III (Varicella-vaccine-live) with your doctor.

The following side effects have been reported by at least 1% of people taking Varivax III (Varicella-vaccine-live). Many of these side effects can be managed, and some may go away on their own over time.

Contact your doctor if you experience these side effects and they are severe or bothersome. Your pharmacist may be able to advise you on managing side effects.

• abdominal pain
• chills
• cough
• dizziness
• fatigue
• fever
• headache
• irritability
• loss of appetite
• nausea
• pain, redness, or soreness where vaccine was injected
• runny or stuffy nose

Although most of the side effects listed below don't happen very often, they could lead to serious problems if you do not check with your doctor or seek medical attention.

Check with your doctor as soon as possible if any of the following side effects occur:

• fever over 39°C orally (102°F)
• muscle or joint pain
• pinpoint red spots on the skin
• rash similar to chickenpox
• severe or continuing headache
• tingling skin
• unusual bleeding or bruising
• vomiting

Seek immediate medical attention if any of the following occur:

• blistering or peeling skin
• seizures or convulsions
• signs of a serious allergic reaction:
• difficulty breathing or swallowing
• Hives
• itching, especially of the feet or hands
• reddening of the skin, especially around the ears
• swelling of the eyes, face, or inside of the nose
• unusual tiredness or weakness (sudden and severe)

Some people may experience side effects other than those listed. Check with your doctor if you notice any symptom that worries you while you are taking Varivax III (Varicella-vaccine-live).

Each 0.5 mL dose contains a minimum of 1,350 PFU (plaque forming units) of Oka/Merck varicella. Nonmedicinal ingredients: hydrolyzed gelatin, monosodium L-glutamate, potassium chloride, potassium phosphate monobasic, sodium chloride, sodium phosphate dibasic, sucrose, and urea; residual components of MRC-5 cells including DNA and protein; and trace quantities of neomycin and fetal bovine serum from MRC-5 culture media. Varivax III (Varicella-vaccine-live) does not contain preservatives.

Do not receive this vaccine if you:

• are allergic to varicella vaccine or any ingredients of Varivax III (Varicella-vaccine-live)
• are allergic to neomycin or gelatin
• are pregnant or planning to become pregnant within 3 months of receiving the vaccine
• are receiving immunosuppressive therapy (e.g., some medications used for the treatment of cancer, radiation therapy, or for transplant recipients)
• have a family history of congenital or hereditary immunodeficiency
• have a suppressed immune system (e.g., those with AIDS)
• have an illness associated with Fever
• have active, untreated Tuberculosis
• have certain blood abnormalities (e.g., Leukemia, lymphoma, or any cancer affecting the bone marrow or lymphatic systems)

There may be an interaction between varicella vaccine and any of the following:

• 5-ASA medications (e.g., Mesalamine, olsalzine, Sulfasalazine)
• Acetaminophen
• acetylsalicylic acid (ASA)
• acyclovir
• Azathioprine
• cancer medications (e.g., Carboplatin, Cyclophosphamide, Doxorubicin, Ifosfamide, Vincristine)
• corticosteroids (e.g., budesonide, Dexamethasone, Hydrocortisone, fluticasone, Prednisone)
• Cyclosporine
• dimethyl fumarate
• famciclovir
• Fingolimod
• Hydroxyurea
• immune globulin
• Leflunomide
• monoclonal antibodies (e.g., Adalimumab, Belimumab, Daclizumab, Golimumab, Infliximab)
• mycophenolate
• Romidepsin
• Tacrolimus
• Valacyclovir
• other vaccines
• varicella zoster immune globulin

If you are taking any of these medications, speak with your doctor or pharmacist. Depending on your specific circumstances, your doctor may want you to:

• stop taking one of the medications,
• change one of the medications to another,
• change how you are taking one or both of the medications, or
• leave everything as is.

An interaction between two medications does not always mean that you must stop taking one of them. Speak to your doctor about how any drug interactions are being managed or should be managed.

Medications other than those listed above may interact with Varivax III (Varicella-vaccine-live). Tell your doctor or prescriber about all prescription, over-the-counter (non-prescription), and herbal medications you are taking. Also tell them about any supplements you take. Since caffeine, alcohol, the Nicotine from cigarettes, or street drugs can affect the action of many medications, you should let your prescriber know if you use them.

Before you begin using a medication, be sure to inform your doctor of any medical conditions or Allergies you may have, any medications you are taking, whether you are pregnant or breast-feeding, and any other significant facts about your health. These factors may affect how you should use Varivax III (Varicella-vaccine-live).

NOTE: Vaccination with varicella virus may not result in protection of all healthy, susceptible children, adolescents, and adults.

Duration of protection: It is not known how long the vaccine's protective effects against chickenpox infection will last.

Fever: A doctor may decide to delay this vaccine if the person receiving the vaccine has an acute infection or fever. Mild infections without fever, such as colds, usually do not require delay of the vaccine.

Immune problems: The safety and effectiveness of this vaccine have not been determined for people with immune system problems. It is possible that varicella vaccine may not create enough of an antibody response to protect against infections caused by this virus. Also, this vaccine may not be effective for people receiving immunosuppressive therapy (e.g., some medications used to treat cancer or for transplant recipients).

Medical conditions: Varicella vaccine should not be given for at least 5 months following a blood or plasma transfusion.

Salicylate therapy: People taking the vaccine should not use salicylates (e.g., Asa) for 6 weeks after vaccination, as Reye's Syndrome may occur. Children and adolescents should avoid using salicylates unless directed by a doctor.

Transmission: Rarely, healthy people taking the vaccine who develop a varicella-like rash may transmit vaccine virus to healthy susceptible people.

People taking the vaccine should try to avoid, whenever possible, close contact with susceptible high-risk people (e.g., people who are immunocompromised, pregnant women without a history of chickenpox, newborns of mothers without a history of chickenpox) for up to 6 weeks after receiving the vaccine.

Pregnancy: The safety of varicella vaccine when given during pregnancy has not been determined. Varicella vaccine is not to be used during pregnancy, and pregnancy should be avoided for 3 months after vaccination.

Breast-feeding: It is not known if varicella vaccine passes into breast milk. If you are a breast-feeding mother and are taking this vaccine, it may affect your baby. Talk to your doctor about whether you should continue breast-feeding.

Children: The safety and effectiveness of using Varivax III (Varicella-vaccine-live) have not been established for children less than 12 months old. It is not recommended for infants under 12 months old.