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Niraparib is in a class of medications called poly (ADP-ribose) polymerase (PARP) inhibitors. It works by killing cancer cells.
Niraparib is used to help maintain the response of certain types of ovarian (female reproductive organs where eggs are formed), fallopian tube (tube that transports eggs released by the ovaries to the uterus), and peritoneal (layer of tissue that lines the stomach). It is also used to treat certain types of ovarian, fallopian tube, or peritoneal cancer. It is called poly (ADP-ribose) polymerase (PARP) inhibitors.