Exemestane is an aromatase inhibitor. It works by lowering the amount of estrogen (natural female hormone) produced in the body. This can lower or stop the growth of some breast cancer cells that need estrogen to grow.

Common side effects of Exemestane
Insomnia (difficulty in sleeping), Headache, Nausea, Increased sweating, Musculoskeletal (bone, muscle or joint) pain, Fatigue