ARIMIDEX does not operate in Girls with breast cancer who definitely have not undergone menopause (premenopausal Gals).Osteoporosis. Arimidex may weaken your bones and boost your threat of bone fractures. When you've got osteoporosis, you could have already got weak bones or bones that are more likely to fracture.A B C D E File G H I J K L M N O P