The US Food and Drug Administration (FDA) has approved a higher, more efficacious dose of fulvestrant (Faslodex, AstraZeneca) injection for treatment of metastatic breast cancer. The newly approved dose of 500 mg replaces the previously approved monthly dose of 250 mg for the treatment of hormone receptor–positive (HR+) metastatic breast cancer in postmenopausal women with disease progression following antiestrogen therapy.