esterified estrogens, Estratab (discontinued); Menest (cont.)
Omudhome Ogbru, PharmD
Omudhome Ogbru, PharmD
Dr. Ogbru received his Doctorate in Pharmacy from the University of the Pacific School of Pharmacy in 1995. He completed a Pharmacy Practice Residency at the University of Arizona/University Medical Center in 1996. He was a Professor of Pharmacy Practice and a Regional Clerkship Coordinator for the University of the Pacific School of Pharmacy from 1996-99.
Medical and Pharmacy Editor:
DOSING: The dose for menopause and related conditions is 0.3 to 1.25 mg daily for 3 weeks then 1 week off. Female hypogonadism is treated with 2.5 to 7.5 mg daily for 20 days then 10 days off. Breast cancer is treated with 10 mg three times daily for at least 3 months and the dose for prostate cancer is 1.25 to 2.5 mg 3 times daily.
DRUG INTERACTIONS: Estrogens increase the liver's ability to manufacture proteins that are required for blood to clot. Therefore, patients receiving warfarin (Coumadin), which reduces clotting ("thins" the blood) by inhibiting the production of proteins required for clotting, should receive clotting tests if an estrogen is added to their treatment. If blood clots too easily, the dose of warfarin may need to be increased.
Rifampin, barbiturates, carbamazepine (Tegretol), griseofulvin, phenytoin (Dilantin) and primidone can increase the elimination of estrogen by enhancing the liver's ability to metabolize (destroy) it. Use of these drugs may result in a reduction of the beneficial effects of estrogens. Conversely, drugs such as erythromycin, ketoconazole (Nizoral), itraconazole (Sporanox), and ritonavir (Norvir) may reduce the elimination of estrogens by the liver and lead to increased levels of estrogens in the blood. Grapefruit juice also may increase levels of estrogen by increasing the absorption of estrogens from the intestine. Increased levels of estrogens in the blood may result in more estrogen-related side effects.
PREGNANCY: Estrogens should not be used during pregnancy because of an increased risk of fetal abnormalities.
NURSING MOTHERS: Estrogens are secreted in milk and cause unpredictable effects in the infant. Therefore, they generally should not be used during breastfeeding.
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