Estropipate; Estrogens, Esterified
Drug class: Antineoplastic Agents
Usage of Estropipate; Estrogens, Esterified
Use of estrogens alone in postmenopausal women generally is referred to as estrogen replacement therapy (ERT); use of estrogens in combination with progestins usually is referred to as hormone replacement therapy (HRT) or postmenopausal hormone therapy.
Estrogen Replacement Therapy
Management of moderate to severe vasomotor symptoms associated with menopause. Esterified estrogens also is used in fixed combination with methyltestosterone in women who do not respond adequately to estrogens alone; FDA is reevaluating this combination.
Management of vulvar and vaginal atrophy associated with menopause. If estrogens are used solely for this indication, consider use of topical vaginal preparations.
Osteoporosis
Prevention of postmenopausal osteoporosis. Used adjunctively with other measures (e.g., diet, calcium, vitamin D, weight-bearing exercise, physical therapy) to retard further bone loss and progression of osteoporosis in postmenopausal women.
Estrogens are effective for prevention of osteoporosis but are associated with a number of adverse effects. If prevention of postmenopausal osteoporosis is the sole indication for therapy, consider alternative therapy (e.g., alendronate, raloxifene, risedronate).
Has been effective in the treatment of osteoporosis in postmenopausal women. Formerly recommended as first-line therapy; however, recommendations on appropriate use of HRT have been revised based on WHI study findings. (See Boxed Warning.) Evaluate risks and benefits of long-term HRT use in the management of osteoporosis, taking into account the increased risk of breast cancer and cardiovascular disease, availability of other pharmacologic modalities (e.g., alendronate, Calcitonin, calcium, raloxifene, risedronate, vitamin D), and life-style factors that can be modified.
Has been used in a limited number of anorexic women with chronic amenorrhea to reduce calcium loss† [off-label] and, thereby, reduce risk of osteoporosis.
Corticosteroid-induced Osteoporosis
Has been used to prevent bone loss in postmenopausal women receiving low- to moderate-dose corticosteroid therapy† [off-label].
Hypoestrogenism
Treatment of hypoestrogenism secondary to hypogonadism, castration, or primary ovarian failure.
Metastatic Breast Carcinoma
Palliative treatment of metastatic breast cancer in selected women and men. One of several second-line agents.
Prostate Carcinoma
Palliative treatment of advanced androgen-dependent prostate carcinoma.
Cardiovascular Risk Reduction† [off-label]
ERT or HRT does not decrease the incidence of cardiovascular disease. AHA, American College of Obstetricians and Gynecologists, FDA, and manufacturers recommend that hormone therapy not be used to prevent heart disease in healthy women (primary prevention) or to protect women with preexisting heart disease (secondary prevention).
Alzheimer’s Disease
Prior use of HRT, but not current HRT unless such use exceeds 10 years, associated with reduced risk of Alzheimer’s disease† [off-label]. Estrogens have not been shown to prevent progression of Alzheimer’s disease, and American Academy of Neurology recommends that estrogens not be used for treatment of Alzheimer’s disease.
Initiation of ERT or HRT in women ≥65 years of age not associated with an improvement in cognitive function. Some women receiving ERT or HRT (specifically conjugated estrogens 0.625 mg in conjunction with medroxyprogesterone acetate 2.5 mg daily or conjugated estrogens 0.625 mg daily) experience detrimental effects. Incidence of probable dementia in women receiving ERT or HRT was higher than that in women receiving placebo. Use of ERT or HRT to prevent dementia or cognitive decline in women ≥65 years of age is not recommended.
Postpartum Breast Engorgement
Used in the past for prevention of postpartum breast engorgement† [off-label]; FDA has withdrawn approval of estrogen-containing drugs for this indication, since estrogens have not been shown to be safe for this use. (See Lactation under Cautions.)
Pregnancy
Not effective for any purpose during pregnancy; use contraindicated in pregnant women. (See Pregnancy under Cautions.)
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How to use Estropipate; Estrogens, Esterified
General
ERT is appropriate in women who have undergone a hysterectomy (avoids unnecessary exposure to progestins).
Administration
Administer estropipate and esterified estrogens orally.
Estrogen therapy generally is administered in a continuous daily dosage regimen or, alternatively, in a cyclic regimen. When administered cyclically, estrogen usually is given once daily for 3 weeks followed by 1 week without the drug; regimen is repeated as necessary.
Oral Administration
Administer orally one or more times daily.
When estropipate or esterified estrogens is used for management of vasomotor symptoms, initiate treatment at any time in women who have not menstruated within the previous 2 months; if patient is menstruating, start cyclic administration on day 5 of cycle.
Dosage
Individualize dosage according to the condition being treated and the tolerance and therapeutic response of the patient.
To minimize risk of adverse effects, use the lowest possible effective dosage. Because of the potential increased risk of cardiovascular events, breast cancer, and venous thromboembolic events, limit estrogen and estrogen/progestin therapy to the lowest effective doses and shortest duration of therapy consistent with treatment goals and risks for the individual woman.
Periodically reevaluate estrogen and estrogen/progestin therapy (i.e., at 3- to 6-month intervals).
Adults
Estrogen Replacement Therapy Vasomotor Symptoms OralEstropipate: 0.75–6 mg daily in a cyclic regimen.
Esterified estrogens: 1.25 mg daily in a cyclic regimen.
Esterified estrogens in fixed combination with methyltestosterone: Esterified estrogens 0.625 mg with methyltestosterone 1.25 mg daily in a cyclic regimen (3 weeks on, 1 week off). Alternatively, esterified estrogens 1.25 mg with methyltestosterone 2.5 mg daily in a cyclic regimen.
Vulvar and Vaginal Atrophy OralEstropipate: 0.75–6 mg daily in a cyclic regimen.
Esterified estrogens: 0.3–≥1.25 mg daily in a cyclic regimen.
Osteoporosis Prevention in Postmenopausal Women OralEstropipate: 0.75 mg daily in a cyclic regimen (25 days on, 6 days off).
Hypoestrogenism Female Hypogonadism OralEstropipate: 1.5–9 mg daily for 3 weeks followed by 8–10 days without the drug; if menstruation does not occur by the end of the 8- to 10-day drug-free period, repeat the same dosage schedule. Number of courses required to induce menstruation varies depending on endometrial responsiveness. If satisfactory withdrawal bleeding does not occur, may administer an oral progestin concomitantly during the third week of the cycle.
Esterified estrogens: 2.5–7.5 mg daily in divided doses for 20 days, followed by 10 days without the drug. Number of courses required to induce menstruation varies depending on endometrial responsiveness. If menstruation does not occur by the end of the first complete cycle, repeat the same dosage schedule. If menstruation occurs before the end of the 10-day drug-free period, initiate estrogen-progestin regimen with esterified estrogens 2.5–7.5 mg given daily in divided doses for 20 days; administer oral progestin during the last 5 days of esterified estrogens administration. If menstruation begins before the estrogen-progestin regimen is completed, discontinue therapy and then reinstitute on the fifth day of menstruation.
Female Castration or Primary Ovarian Failure OralEstropipate: 1.5–9 mg daily for 3 weeks, followed by 8–10 days without the drug. Adjust dosage according to severity of symptoms and therapeutic response.
Esterified estrogens: 1.25 mg daily in a cyclic regimen. Adjust dosage according to severity of symptoms and therapeutic response.
Metastatic Breast Carcinoma OralEsterified estrogens: 10 mg 3 times daily for ≥3 months.
Prostate Carcinoma OralEsterified estrogens: 1.25–2.5 mg 3 times daily.
Warnings
Contraindications
Warnings/Precautions
Warnings
Cardiovascular DisordersEstrogen/progestin therapy associated with increased risk of MI, stroke, DVT, and pulmonary embolism. Estrogen therapy associated with increased risk of stroke and DVT. (See Boxed Warning.) Discontinue estrogens immediately if any of these events occur or are suspected. Use of ERT or HRT is not advised in women with a history of stroke or transient ischemic attacks. (See Contraindications under Cautions.)
Appropriately manage risk factors for cardiovascular disease (e.g., hypertension, diabetes mellitus, tobacco use, hypercholesterolemia, obesity) and/or venous thromboembolism (personal or family history of venous thromboembolism, obesity, systemic lupus erythematosus). (See Contraindications under Cautions.)
Discontinue estrogens, whenever feasible, at least 4–6 weeks prior to surgery that is associated with an increased risk of thromboembolism or during prolonged immobilization.
Endometrial CancerUse of unopposed estrogen therapy in women who have a uterus is associated with increased risk of endometrial cancer. Clinical surveillance and evaluation are essential. Perform diagnostic tests to rule out malignancy in women with undiagnosed, persistent or recurring abnormal vaginal bleeding.
Incidence of endometrial hyperplasia is reduced substantially when progestins are used concomitantly.
Breast CancerHRT associated with an increased risk of breast cancer.
All postmenopausal women should receive yearly breast examinations by a clinician and perform monthly self-examinations. Schedule periodic mammography based on patient age and risk factors.
DementiaERT or HRT in women ≥65 years of age has been associated with increased risk of developing probable dementia. Whether these findings apply to younger women is unknown. (See Alzheimer’s Disease under Uses.)
Gallbladder DiseaseERT associated with increased risk of gallbladder disease requiring surgery.
HypercalcemiaEstrogens may cause severe hypercalcemia in patients with breast cancer and bone metastases. Discontinue the drug and initiate appropriate therapy to reduce serum calcium concentrations if hypercalcemia occurs.
Ocular EffectsRetinal thrombosis reported. Discontinue pending examination if sudden partial or complete loss of vision, or sudden onset of proptosis, diplopia, or migraine occurs. Discontinue estrogen if papilledema or retinal vascular lesions noted on examination.
General Precautions
Elevated BPRarely, substantial increases in BP attributed to idiosyncratic reactions to estrogen. ERT generally is not associated with elevated BP. Monitor BP at regular intervals.
HypertriglyceridemiaEstrogen therapy may be associated with increases in plasma triglyceride concentrations resulting in pancreatitis in women with increased serum lipids.
Fluid RetentionEstrogens may cause some degree of fluid retention; use with caution and careful monitoring in patients with conditions that might be aggravated by fluid retention (e.g., cardiac or renal impairment).
HypocalcemiaUse with caution in patients with severe hypocalcemia.
Ovarian CancerLong-term estrogen therapy associated with increased incidence of ovarian cancer in some epidemiologic studies. Other studies did not show a clinically important association.
EndometriosisEstrogens may exacerbate endometriosis.
Malignant transformation of residual endometrial implants reported rarely in women receiving unopposed estrogen following hysterectomy. Consider the addition of progestin in women with residual endometriosis following hysterectomy.
Other ConditionsEstrogens may exacerbate asthma, diabetes mellitus, epilepsy, migraine, porphyria, systemic lupus erythematosus, and hepatic hemangiomas; use with caution in patients with these conditions.
Combination TherapyWhen esterified estrogens is used in fixed combination with methyltestosterone or estrogens are used in conjunction with a progestin, consider the precautions, cautions, and contraindications of the concomitant agent.
Specific Populations
PregnancyCategory X. (See Contraindications under Cautions.)
In utero exposure of females to diethylstilbestrol (DES [no longer commercially available in US]) is associated with increased risk of vaginal adenosis, squamous cell dysplasia of the cervix, and clear-cell vaginal cancer in later life.
In utero exposure of males to DES is associated with an increased risk of genital abnormalities and possibly testicular cancer later in life.
Women who receive DES during pregnancy may be at increased risk of breast cancer; causal relationship unproven.
LactationAdministration of estrogens to nursing women has been associated with decreased amounts and lower quality of milk. Detectable amounts of estrogens have been identified in milk of women receiving these drugs. Caution advised.
Pediatric UseEstrogen therapy has been used for induction of puberty in adolescents with some forms of pubertal delay. Safety and efficacy of estrogens in children not otherwise established.
Use estrogen therapy with caution and careful monitoring if bone growth is not yet complete, since estrogens may cause premature epiphyseal closure.
Geriatric UseInsufficient experience with esterified estrogens in fixed combination with methyltestosterone (Estratest, Estratest HS) in geriatric patients to determine whether geriatric patients respond differently than younger women. Select dosage with caution because of age-related decreases in hepatic, renal, and/or cardiac function and potential concomitant disease and drug therapy.
Possible increased risk of developing probable dementia in women ≥65 years of age. (See Dementia under Cautions.)
Hepatic ImpairmentEstrogens may be poorly metabolized in patients with hepatic impairment. (See Contraindications under Cautions.)
Caution advised in patients with a history of cholestatic jaundice associated with previous estrogen use or with pregnancy; discontinue if jaundice recurs.
Renal ImpairmentUse with caution. (See Fluid Retention under Cautions.)
Common Adverse Effects
Vaginal hemorrhage, vaginal moniliasis.
What other drugs will affect Estropipate; Estrogens, Esterified
Appears to be metabolized partially by CYP3A4.
Drugs Affecting Hepatic Microsomal Enzymes
CYP3A4 inhibitors: Potential pharmacokinetic interaction (increased plasma estrogen concentrations).
CYP3A4 inducers: Potential pharmacokinetic interaction (decreased plasma estrogen concentrations).
Specific Drugs and Foods
Drug or Food
Interaction
Comments
Anticoagulants, oral
Possible decreased anticoagulant action
Monitor; increase warfarin dosage if required
Antifungals, azoles (itraconazole, ketoconazole)
Possible increased plasma estrogen concentrations; increased potential for adverse effects
Possible decreased plasma estrogen concentrations; potential for decrease in therapeutic effects and/or changes in uterine bleeding
Corticosteroids (hydrocortisone)
Enhanced anti-inflammatory effects of hydrocortisone in patients with chronic inflammatory skin disease
Observe for signs of excessive corticosteroid effects; adjust corticosteroid dosage when initiating or discontinuing estrogen
Grapefruit juice
Possible increased plasma estrogen concentrations; increased potential for adverse effects
Macrolide antibiotics (clarithromycin, erythromycin)
Possible increased plasma estrogen concentrations; increased potential for adverse effects
Phenobarbital
Possible decreased plasma estrogen concentrations; potential for decrease in therapeutic effects and/or changes in uterine bleeding
Rifampin
Possible decreased plasma estrogen concentrations; potential for decrease in therapeutic effects and/or changes in uterine bleeding
Ritonavir
Possible increased plasma estrogen concentrations; increased potential for adverse effects
St. John’s wort (Hypericum perforatum)
Possible decreased plasma estrogen concentrations; potential for decrease in therapeutic effects and/or changes in uterine bleeding
Thyroid agents
Increased thyroid-binding globulin concentrations
Increased dosages of thyroid replacement agents may be needed; monitor thyroid function
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