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(esterified estrogens) Tablets, USP


Close clinical surveillance of all women taking estrogens is important.Adequate diagnostic measures,including endometrial sampling when indicated, should be undertaken to rule out malignancy in all cases of undiagnosed persistent or recurring abnormal vaginal bleeding. There is no evidence that the use of "natural" estrogens results in a different endometrial risk profile than synthetic estrogens at equivalent estrogen doses. (See WARNINGS, Malignant neoplasms, Endometrial cancer.)


Estrogens with and without progestins should not be used for the prevention of cardiovascular disease. (See WARNINGS, Cardiovascular disorders.)

The Women's Health Initiative (WHI) study reported increased risks of myocardial infarction, stroke, invasive breast cancer, pulmonary emboli, and deep vein thrombosis in postmenopausal women (50 to 79 years of age) during 5 years of treatment with oral conjugated estrogens (CE 0.625 mg) combined with medroxyprogesterone acetate (MPA 2.5 mg) relative to placebo (See CLINICAL PHARMACOLOGY, Clinical Studies.)

The Women's Health Initiative Memory Study (WHIMS), a sub-study of WHI, reported increased risk of developing probable dementia in postmenopausal women 65 years of age or older during 4 years of treatment with oral conjugated estrogens plus medroxyprogesterone acetate relative to placebo. It is unknown whether this finding applies to younger postmenopausal women or to women taking estrogen alone therapy. (See CLINICAL PHARMACOLOGY, Clinical Studies.)

Other doses of conjugated estrogens with medroxyprogesterone acetate,and other combinations and dosage forms of estrogens and progestins were not studied in the WHI clinical trials and,in the absence of comparable data,these risks should be assumed to be similar. Because of these risks, 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.


Esterified estrogens is a mixture of the sodium salts of the sulfate esters of the estrogenic substances, principally estrone, that are of the type excreted by pregnant mares. The content of total esterified estrogens is not less than 90 percent and not more than 110 percent of the labeled amount. Esterified estrogens contain not less than 75 percent and not more than 85 percent of sodium estrone sulfate, and not less than 6 percent and not more than 15 percent of sodium equilin sulfate, in such proportion that the total of these two components is not less than 90 percent, all percentages being calculated on the basis of the total esterified estrogens content.

Inactive Ingredients: Ethyl cellulose, fragrances, hydroxypropyl cellulose, hypromellose 2910, lactose, magnesium stearate, methylcellulose, polyethylene glycol, sodium bicarbonate, shellac, starch, stearic acid, titanium dioxide, and vanillin. Dyes in the form of aluminum lakes are contained in each tablet strength as follows: 0.3 mg Tablet: FD&C Yellow No. 6, D&C Yellow No. 10. 0.625 mg Tablet: FD&C Yellow No.6, D&C Yellow No.10. 1.25 mg Tablet: FD&C Yellow No.6, D&C Yellow No.10, FD&C Blue No.1. 2.5 mg Tablet: D&C Red No.30.

What are the possible side effects of esterified estrogens (Estratab, Menest)?

If you experience any of the following serious side effects, stop taking esterified estrogens and seek emergency medical attention:

  • an allergic reaction (difficulty breathing; closing of your throat; swelling of your lips, tongue, or face; or hives);
  • a blood clot (pain, redness, and swelling in an arm or leg, shortness of breath, chest pain, headache, blurred vision, or confusion);
  • a lump in a breast; or
  • liver damage (yellowing of the skin or eyes, nausea, abdominal pain or discomfort, unusual bleeding or bruising, severe...

Read All Potential Side Effects and See Pictures of Menest »

Last reviewed on RxList: 10/28/2008
This monograph has been modified to include the generic and brand name in many instances.

Report Problems to the Food and Drug Administration


You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.

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