R-Vac injection contains the live attenuated rubella virus. It belongs to the class of medications called immunological agents. It is used to prevent rubella. Rubella is a viral disease that mainly affects the fetus if a woman is infected with this virus during the first three months of pregnancy.  This vaccine is given to children to prevent them from the disease. Do not use this medicine if you are allergic to any virus or gelatin. This vaccine is not recommended for pregnant women. Inform your physician if you are using medicines that weaken the immune system. Inform your physician if you have a high fever, active infection, HIV or AIDS, blood problems, or any other medical conditions before receiving this vaccine. Do not self-administer the vaccine. Like other vaccines, the R-Vac injection can cause mild side effects like pain and redness at the injection site, low-grade fever, rash, and upper respiratory infections like cough and cold. If MMR (mumps, measles, rubella) combination vaccine is missed, your doctor will administer this separate vaccine at the age of 12 years and above.