"Rhogam-Rho(D) immune globulin is a medication used to prevent Rh isoimmunization in mothers who are Rh negative and to treat idiopathic thrombocytopenic purpura (ITP) in people who are Rh positive.[1] It is often given both during and following pregnancy.[1] It may also be used when Rh negative people are given Rh positive blood.[1] It is given by injection into muscle or a vein.[1] A single dose lasts 2 to 4 weeks.[1] Rho(D) immune globulin Trade names WinRho, RhoGAM, others Synonyms Rh0(D) immune globulin, anti-D (Rh0) immunoglobulin administration intramuscular injection Common side effects include fever, headache, pain at the site of injection, and red blood cell breakdown.[1] Other side effects include allergic reactions, kidney problems, and a very small risk of viral infections.[1] In those with ITP the amount of red blood cell breakdown may be significant.[1] Use is safe with breastfeeding.[1] Rho(D) immune globulin is made up of antibodies to the antigen Rho(D) present on some red blood cells.[1] It is believed to work by blocking a person's immune system from recognizing this antigen.[1]"

- w-pedia