Precautions for Patients Taking Aromatase Inhibitors

Aromatase inhibitors are the drug of choice for the treatment of estrogen receptor– or progesterone receptor–positive breast cancer in postmenopausal women. Aromatase is an enzyme that catalyzes the final and rate-limiting step in the biosynthesis of estrogen. Inhibitors of this enzyme are an effective therapy for breast cancer. The benefits of these agents have been clearly shown through various clinical trials, yet adherence may be challenging for some patients due to issues of drug interactions, proper first dose education, and adverse effects. Education to prevent and treat adverse effects is of the utmost importance to promote adherence.