Olaparib is used to treat cancers of the breast, ovary, fallopian tube, pancreas, prostate, or peritoneum (the membrane that lines the inside of your abdomen and covers some of your internal organs).
Olaparib is sometimes used when the cancer has spread to other parts of the body, or when cancer has come back after treatment with other medications.
Olaparib is sometimes used only if your cancer has a specific genetic marker (an abnormal "BRCA" or "HRR" gene). Your doctor will test you for this gene.
Olaparib may also be used for purposes not listed in this medication guide.
