Before you or your child receives this vaccine, be sure to inform your doctor of any medical conditions or allergies you or your child may have, any medications you or your child is taking, whether you are pregnant or breast-feeding, and any other significant facts about your child or your health. These factors may affect the vaccine you or your child is receiving.
Allergy to eggs: People who have an allergy to eggs that causes anaphylaxis (hives, swelling of the mouth and throat, difficulty breathing) should discuss with their doctor the risks and benefits of receiving this vaccine and whether any special monitoring is needed.
HIV infection that is not symptomatic: Children and young adults known to be infected with HIV but without symptoms may be vaccinated; however, they should be monitored closely for exposure to vaccine-preventable diseases because vaccination may be less effective.
Low platelet counts: People with low platelet counts (thrombocytopenia) or who experienced low platelet counts with the first dose of this vaccine should discuss with their doctor how this medication may affect their medical condition and whether any special monitoring is needed.
Seizures or fever: People with a personal or family history of seizures, a history of brain injury, or a condition in which fever should be avoided should discuss with their doctor how this medication may affect their medical condition and whether any special monitoring is needed.
Vaccine protection: As for any vaccine, the measles, mumps, and rubella vaccine may not protect 100% of people who receive it and may not prevent infection in those people already infected with the viruses.
Pregnancy: This vaccine is not recommended for women who are pregnant or who intend to become pregnant within the next 3 months. Women who may become pregnant should take necessary precautions to avoid pregnancy for 3 months following vaccination. If you become pregnant within 3 months of receiving the vaccine, talk to your doctor.
Breast-feeding: The rubella virus may pass into breast milk but it is not known if the measles or mumps vaccine passes into breast milk. If you are a breast-feeding mother and are receiving this vaccine, it may affect your baby. Talk to your doctor about whether you should continue breast-feeding.
Children: The safety and effectiveness of this vaccine have not been established for children younger than 12 months of age. In special situations, however, your child's doctor may recommend this vaccine for children under 12 months of age.