A practical U.S. comparison of anastrozole and exemestane, including effectiveness, dosing, side effects, bone health, interactions, and reasons an oncology team may recommend one over the other. The question of Arimidex vs Aromasin often comes up when a person is starting endocrine therapy for hormone receptor-positive breast cancer or considering a switch because of side effects. Arimidex is the brand name for anastrozole, while Aromasin is the brand name for exemestane. Both lower estrogen by…