Olaparib 150 mg tablets are an anticancer medication used in the treatment of certain types of ovarian cancer, breast cancer, pancreatic cancer, and prostate cancer, particularly in patients with BRCA gene mutations. It belongs to a class of drugs called PARP (poly ADP-ribose polymerase) inhibitors, which work by blocking the DNA repair mechanism in cancer cells. This action prevents cancer cells from repairing themselves, leading to their destruction and slowing the growth and spread of tumors. Olaparib is often used as maintenance therapy after initial cancer treatment to help delay disease progression. Possible side effects may include nausea, fatigue, anemia, decreased appetite, and weakness, and it should be used under the supervision of an oncologist.