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Estradiol Acetate (Vaginal Ring)

Endometrial Cancer. Cardiovascular Disorders, Breast Cancer and Probable Dementia

Endometrial Cancer

  • There is an increased risk of endometrial cancer in a woman with a uterus who uses unopposed estrogens. Adding a progestin to estrogen therapy has been shown to reduce the risk of endometrial hyperplasia,which may be a precursor to endometrial cancer. Adequate diagnostic measures, including directed and random endometrial sampling when indicated, should be undertaken to rule out malignancy in all cases of undiagnosed persistent or recurring abnormal genital bleeding. (See WARNINGS, Malignant Neoplasms, Endometrial Cancer.)

Cardiovascular Disorders and Probable Dementia

  • Estrogen-alone therapy should not be used for the prevention of cardiovascular disease or dementia. (See CLINICAL STUDIES and WARNINGS, Cardiovascular Disorders, and Probable Dementia.) The Women’s Health Initiative (WHI) estrogen-alone substudy reported increased risks of stroke and deep vein thrombosis (DVT) in postmenopausal women (50 to 79 years of age) during 7.1 years of treatment with daily oral conjugated estrogens (CE) [0.625 mg]-alone, relative to placebo. (See CLINICAL STUDIES and WARNINGS, Cardiovascular Disorders.)
  • The WHI Memory Study (WHIMS)estrogen-alone ancillary study of the WHI reported an increased risk of developing probable dementia in postmenopausal women 65 years of age or older during 5.2 years of treatment with daily CE (0.625 mg)-alone, relative to placebo. It is unknown whether this finding applies to younger postmenopausal women. (See CLINICAL STUDIES and WARNINGS, Probable Dementia and PRECAUTIONS, Geriatric Use.)
  • In the absence of comparable data, these risks should be assumed to be similar for other doses of CE and other dosage forms of estrogens.
  • Estrogens with or without progestins should be prescribed at the lowest effective doses and for the shortest duration consistent with treatment goals and risks for the individual woman.

EstrogenPlusProgestinTherapy
        Cardiovascular Disorders and Probable Dementia

  • Estrogen plus progestin therapy should not be used for the prevention of cardiovascular disease or dementia. (See CLINICAL STUDIES and WARNINGS, Cardiovascular Disorders and Probable Dementia.)
  • The WHI estrogen plus progestin substudy reported increased risks of DVT, pulmonary embolism (PE), stroke and myocardial infarction (MI) in postmenopausal women (50 to 79 years of age) during 5.6 years of treatment with daily oral CE (0.625 mg) combined with medroxyprogesterone acetate (MPA) [2.5 mg], relative to placebo. (See CLINICAL STUDIES and WARNINGS, Cardiovascular Disorders.)
  • The WHIMS estrogen plus progestin ancillary study of the WHI reported an increased risk of developing probable dementia in postmenopausal women 65 years of age or older during 4 years of treatment with daily CE (0.625 mg) combined with MPA (2.5 mg), relative to placebo. It is unknown whether this finding applies to younger postmenopausal women. (See CLINICAL STUDIES and WARNINGS, Probable Dementia and PRECAUTIONS, Geriatric Use.)

         Breast Cancer

  • The WHI estrogen plus progestin substudy also demonstrated an increased risk of invasive breast cancer. (See CLINICAL STUDIES and WARNINGS, Malignant Neoplasms, Breast Cancer.)
  • In the absence of comparable data, these risks should be assumed to be similar for other doses of CE plus MPA, and other combinations and dosage forms of estrogens and progestins.
  • Estrogens with or without progestins should be prescribed at the lowest doses and for the shortest duration consistent with treatment goals and risks for the individual woman.

MONITORING RECOMMENDATIONS RELATED TO BLACK BOX DATA

  • Use lowest possible estrogen dose to control symptoms and discontinue medication as soon as possible
  • If prolonged treatment indicated, reassess patient on at least a semi-annual basis to determine need for continued therapy
  • Close clinical surveillance recommended, monitor for persistent/recurrent abnormal vaginal bleeding.
  • Exposure during pregnancy requires patient appraisal of potential risks.

FDA and Industry Communications

Index to FDA Drug Safety Information

Package Inserts

Estradiol Acetate 

Updated January 2018