ARIMIDEX and the ATAC Clinical Trial
ARIMIDEX was put to the test, taken both against, or combined with the antiestrogen medication tamoxifen. That’s why it’s called “ATAC”– which stands for “ARIMIDEX, Tamoxifen Alone or in Combination.”
More than 9300 postmenopausal women, each with early breast cancer, were studied for over 10 years. The study period included 5 years of treatment, and 5 years post-treatment.
Women who took ARIMIDEX experienced an improvement in disease-free survival compared with those who took only tamoxifen.
Important Safety Information About ARIMIDEX
- Prescription ARIMIDEX is only for postmenopausal women. ARIMIDEX should not be taken if you are pregnant because it may harm your unborn child. Do not take ARIMIDEX if you are allergic to any of its ingredients
- Based on information from a study in patients with early breast cancer, women with a history of blockages in heart arteries (ischemic heart disease) who take ARIMIDEX may have a slight increase in this type of heart disease compared to similar patients who take tamoxifen
- ARIMIDEX can cause bone softening/weakening (osteoporosis) increasing the chance of fractures. In a clinical study in early breast cancer, there were more fractures (including fractures of the spine, hip, and wrist) with ARIMIDEX (10%) than with tamoxifen (7%)
- In a clinical study in early breast cancer, some patients taking ARIMIDEX had an increase in cholesterol. Skin reactions, allergic reactions, and changes in blood tests of liver function have also been reported
- 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
- In advanced breast cancer trials, the most common side effects seen with ARIMIDEX versus tamoxifen include hot flashes, nausea, decreased energy and weakness, pain, back pain, headache, bone pain, increased cough, shortness of breath, sore throat, and swelling of arms and legs. Joint pain/stiffness has been reported in association with the use of ARIMIDEX
- ARIMIDEX should not be taken with tamoxifen or estrogen-containing therapies
Approved Uses for ARIMIDEX
ARIMIDEX is approved for adjuvant treatment (treatment following surgery with or without radiation) of postmenopausal women with hormone receptor-positive early breast cancer.
ARIMIDEX is approved for the initial treatment of postmenopausal women with hormone receptor-positive or hormone receptor-unknown locally advanced or metastatic breast cancer and for the treatment of postmenopausal women with advanced breast cancer that has progressed following treatment with tamoxifen. Patients with hormone receptor-negative disease and patients who did not previously respond to tamoxifen therapy rarely responded to ARIMIDEX.
For more information, see your doctor.
Please see full Prescribing Information.
You are encouraged to report negative side effects of prescription drugs to the FDA. Visit www.FDA.gov/medwatch or call 1-800-FDA-1088.
This site is intended for US consumers only.
The information on this Web site should not take the place of talking with your doctor or health care professional. If you have any questions about your condition, or if you would like more information about ARIMIDEX, talk to your doctor or pharmacist. Only you and your health care professional can decide if ARIMIDEX is right for you.