In the early breast cancer clinical trial, the most common
side effects seen with ARIMIDEX include hot flashes,
joint symptoms (including arthritis and arthralgia), weakness, mood changes, pain, back pain, sore throat, nausea and vomiting, rash, depression, high blood pressure, osteoporosis, fractures, swelling of arms/legs, insomnia, and headache.
Patients taking ARIMIDEX were less likely than those taking tamoxifen to stop treatment because of side effects.