Drug Notebook

FDA Alerts

  • Estrogens increase the risk of endometrial cancer in postmenopausal women. (See Endometrial Cancer under Cautions.)
  • Do not use estrogens with or without progestins for prevention of cardiovascular disease (see Cardiovascular Risk Reduction under Uses and Cardiovascular Disorders under Cautions) or dementia (see Alzheimer’s Disease under Uses).
  • The Women’s Health Initiative (WHI) study of estrogen alone reported increased risks of stroke and DVT in postmenopausal women receiving approximately 7 years of therapy with conjugated estrogens 0.625 mg daily.
  • The WHI study of estrogen plus progestin reported increased risks of MI, stroke, invasive breast cancer, pulmonary embolism, and DVT in postmenopausal women receiving ≥5 years of therapy with conjugated estrogens 0.625 mg in conjunction with medroxyprogesterone acetate 2.5 mg daily.
  • The WHI Memory Study (WHIMS) reported increased risk of developing probable dementia in postmenopausal women ≥65 years of age receiving long-term therapy (4–5 years) with conjugated estrogens in conjunction with medroxyprogesterone acetate or conjugated estrogens alone. Not known whether this finding also applies to younger postmenopausal women.
  • Other dosages of conjugated estrogens with medroxyprogesterone and other combinations or dosage forms of estrogens with progestin not studied in WHI trials; in the absence of comparable data, assume risks are similar.
  • Prescribe estrogens (with or without progestins) at the lowest effective dose and for the shortest duration consistent with treatment goals and risks for the individual woman.

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What is the most important information I should know about conjugated estrogens?

Do not use this medication if you have any of the following conditions: a history of heart attack, stroke, or blood clot (especially in your lung or your lower body), liver disease, abnormal vaginal bleeding, or a hormone-related cancer such as breast or uterine cancer. This medication can cause birth defects in an unborn baby. Do not use conjugated estrogens if you are pregnant.

Long-term treatment with conjugated estrogens may increase your risk of breast cancer, heart attack, or stroke. Talk with your doctor about your individual risks before using conjugated estrogens long term, especially if you smoke or are overweight. Your doctor should check your progress on a regular basis (every 3 to 6 months) to determine whether you should continue this treatment.

Have regular physical exams and self-examine your breasts for lumps on a monthly basis while using conjugated estrogens.

Conjugated estrogens should not be used to prevent heart disease or dementia, because this medication may actually increase your risk of developing these conditions.

What are conjugated estrogens?

Estrogen is a female sex hormone produced by the ovaries. Estrogen is necessary for many processes in the body.

Conjugated estrogens are a mixture of estrogen hormones used to treat symptoms of menopause such as hot flashes, and vaginal dryness, burning, and irritation. Other uses include prevention of osteoporosis in postmenopausal women, and replacement of estrogen in women with ovarian failure or other conditions that cause a lack of natural estrogen in the body. Conjugated estrogens are sometimes used as part of cancer treatment in women and men.

Conjugated estrogens should not be used to prevent heart disease or dementia, because this medication may actually increase your risk of developing these conditions.

Conjugated estrogens may also be used for other purposes not listed in this medication guide.

What should I discuss with my healthcare provider before taking conjugated estrogens?

Do not use conjugated estrogens if you have:
  • a history of heart attack, stroke, or blood clot (especially in your lung or your lower body);

  • abnormal vaginal bleeding that a doctor has not checked;

  • liver disease; or

  • any type of breast, uterine, or hormone-dependent cancer.

Before using conjugated estrogens, tell your doctor if you are allergic to any drugs, or if you have:

Conjugated estrogens increase your risk of developing endometrial hyperplasia, a condition that may lead to cancer of the uterus. Taking progestins while using conjugated estrogens may lower this risk. If your uterus has not been removed, your doctor may prescribe a progestin for you to take while you are using conjugated estrogens.

Long-term conjugated estrogens treatment may increase your risk of stroke or blood clots. Talk with your doctor about your individual risks before using conjugated estrogens long term, especially if you smoke or are overweight. Your doctor should check your progress on a regular basis (every 3 to 6 months) to determine whether you should continue this treatment.

FDA pregnancy category X. This medication can cause birth defects. Do not use conjugated estrogens if you are pregnant. Tell your doctor right away if you become pregnant during treatment. Use an effective form of birth control while you are using this medication. Conjugated estrogens can pass into breast milk and may harm a nursing baby. This medication may also slow breast milk production. Do not use if you are breast-feeding a baby. Do not give this medication to anyone under 18 years old without the advice of a doctor.
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