Dactinomycin is used in combination with other medications, surgery, and/or radiation therapy to treat Wilms' tumor (a type of kidney cancer that occurs in children) and rhabdomyosarcoma (cancer that forms in muscles) in children. Dactinomycin is also used in combination with other medications to treat certain types of testicular cancer and Ewing's sarcoma (a type of cancer in bones or muscles). Dactinomycin is also used alone or in combination with other medications to treat gestational trophoblastic tumors (a type of tumor that forms inside a woman's uterus while she is pregnant). Dactinomycin may also be used to treat certain types of cancerous tumors that are located in a specific area of the body. Dactinomycin is a type of antibiotic that is only used in cancer chemotherapy. It works by slowing or stopping the growth of cancer cells in your body

Dactinomycin comes as a powder to be mixed with liquid to be injected intravenously (into a vein) by a doctor or nurse in a medical facility. The length of treatment depends on the type of cancer you have, the types of other drugs you are taking, and how well your body responds to treatment. Your doctor may need to stop or delay your treatment if you experience certain side effects. Dactinomycin may also be injected by a doctor directly into a specific the part of the body or the organ to treat the area where a tumor is located.