Drug: Duavee

DUAVEE (conjugated estrogens/bazedoxifene), contains conjugated estrogens with bazedoxifene, an estrogen agonist/antagonist. Conjugated estrogens are purified from pregnant mares' urine and consist of the sodium salts of water-soluble estrogen sulfates blended to represent the average composition of material derived from pregnant mares' urine. Conjugated estrogens are a mixture of sodium estrone sulfate and sodium equilin sulfate, and also contain as concomitant components, sodium sulfate conjugates, 17α-dihydroequilin, 17α-estradiol, and 17β-dihydroequilin. Bazedoxifene is supplied as the acetate salt (bazedoxifene acetate) and has the chemical name 1H-Indol-5-ol, 1-[[4-[2-(hexahydro-1H-azepin-1-yl) ethoxy]phenyl]methyl]-2-(4- hydroxyphenyl)-3-methyl-, monoacetate. The empirical formula is C30H34N2O3 • C2H4O2, and the molecular weight is 530.65. Bazedoxifene acetate is a white to tan powder. The aqueous solubility of bazedoxifene is pHdependent. Solubility is higher at lower pH. The solubility of bazedoxifene acetate in unbuffered sterile water was measured to be 923 μgA/mL at pH 5.4. The following represents the chemical structure of bazedoxifene acetate: DUAVEE is available for oral administration as tablets containing 0.45 mg of conjugated estrogens with 20 mg of bazedoxifene (equivalent to 22.6 mg of bazedoxifene acetate). Each tablet of DUAVEE contains the following inactive ingredients: calcium phosphate tribasic, hydroxypropyl cellulose, microcrystalline cellulose, powdered cellulose, hypromellose, lactose monohydrate, magnesium stearate, polyethylene glycol, sucrose, ascorbic acid, sucrose palmitic acid ester, hydroxyethylcellulose, titanium dioxide, red iron oxide, yellow iron oxide, black iron oxide, povidone, polydextrose, maltitol, poloxamer 188, propylene glycol, and isopropyl alcohol. Last reviewed on RxList: 11/7/2013
This monograph has been modified to include the generic and brand name in many instances.

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The following adverse reactions are discussed in greater detail in other sections of the label:
  • Cardiovascular Disorders [see WARNINGS AND PRECAUTIONS]
  • Malignant Neoplasms [see WARNINGS AND PRECAUTIONS]
  • Gallbladder Disease [see WARNINGS AND PRECAUTIONS]
  • Hypertriglyceridemia [see WARNINGS AND PRECAUTIONS]
Clinical Trials Experience Because clinical trials are conducted under widely varying conditions, adverse reaction rates observed in the clinical trials of a drug cannot be directly compared to rates in the clinical trials of another drug and may not reflect the rates observed in clinical practice. The safety of conjugated estrogens/bazedoxifene was evaluated in four Phase 3 clinical trials ranging from 12 weeks to 24 months in duration and enrolling 6,210 postmenopausal women age 40 to 75 years (mean age 55 years). A total of 1,224 patients were treated with DUAVEE and 1,069 patients received placebo. Women enrolled in Studies 1 and 2 received calcium (600-1200 mg) and vitamin D (200-400 IU) daily, while women in Studies 3 and 4 received no calcium and vitamin D supplementation as part of the protocol. The incidence of all-cause mortality was 0.0% in the DUAVEE group and 0.2% in the placebo group. The incidence of serious adverse reactions was 3.5% in the DUAVEE group and 4.8% in the placebo group. The percentage of patients who withdrew from treatment due to adverse reactions was 7.5% in the DUAVEE group and 10.0% in the placebo group. The most common adverse reactions leading to discontinuation were hot flush, abdominal pain upper, and nausea. The most commonly observed adverse reactions (incidence ≥ 5%) more frequently reported in women treated with DUAVEE than placebo are presented in Table 1. Table 1: Adverse Reactions (Incidence ≥ 5%) More Common in the DUAVEE Treatment Group in Placebo-controlled Trials
  DUAVEE
(N=1224)
n (%) Placebo
(N=1069)
n (%) Gastrointestinal disorders Nausea 100 (8) 58 (5) Diarrhea 96 (8) 57(5) Dyspepsia 84 (7) 59 (6) Abdominal pain upper 81(7) 58 (5) Musculoskeletal and connective tissue disorders Muscle spasms 110 (9) 63 (6) Neck pain 62 (5) 46 (4) Nervous system disorders Dizziness 65 (5) 37 (3) Respiratory, thoracic, and mediastinal disorders Oropharyngeal pain 80 (7) 61(6) Venous thromboembolism In the clinical studies with DUAVEE, the reporting rates for venous thromboembolism (deep venous thrombosis, pulmonary embolism, and retinal vein thrombosis) were low in all treatment groups. Adverse reactions of venous thromboembolism were reported in 0.0% of patients treated with DUAVEE and 0.1% of patients treated with placebo. Due to the low rate of events in both groups, it is not possible to conclude that the risk of venous thromboembolism with DUAVEE is different from that seen with other estrogen therapies [see WARNINGS AND PRECAUTIONS]. Read the Duavee (conjugated estrogens and bazedoxifene tablets) Side Effects Center for a complete guide to possible side effectsLearn More »

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Treatment of Moderate to Severe Vasomotor Symptoms Associated with Menopause The recommended dosage is one DUAVEE tablet daily. Prevention of Postmenopausal Osteoporosis The recommended dosage is one DUAVEE tablet daily. General Dosing Information Take DUAVEE once daily, without regard to meals. Tablets should be swallowed whole. Recommendations for Calcium and Vitamin D Supplementation Women taking DUAVEE for prevention of postmenopausal osteoporosis should add supplemental calcium and/or vitamin D to their diet if daily intake is inadequate. Administration Instructions for Missed Doses If a dose of DUAVEE is missed, instruct patients to take it as soon as remembered unless it is almost time for the next scheduled dose. They should not take two doses at the same time. Use in Patients with Renal Impairment The pharmacokinetics of DUAVEE have not been evaluated in patients with renal impairment. Use in patients with renal impairment is not recommended [see Use in Specific Populations and CLINICAL PHARMACOLOGY]. Use in the Elderly DUAVEE has not been studied in women over 75 years of age. Use in women over 75 years of age is not recommended.

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No drug interaction studies were conducted with DUAVEE. Results from in vitro and in vivo studies and clinical studies conducted with the conjugated estrogens or bazedoxifene components of DUAVEE are noted below: Cytochrome P450 (CYP) In vitro and in vivo studies have shown that estrogens are metabolized partially by cytochrome P450 3A4 (CYP3A4). Therefore, inducers or inhibitors of CYP3A4 may affect estrogen drug metabolism. Inducers of CYP3A4, such as St. John's Wort (Hypericum perforatum) preparations, phenobarbital, carbamazepine, and rifampin, may reduce plasma concentrations of estrogens, possibly resulting in a decrease in therapeutic effects and/or changes in the uterine bleeding profile. Inhibitors of CYP3A4, such as erythromycin, clarithromycin, ketoconazole, itraconazole, ritonavir and grapefruit juice, may increase the exposure of conjugated estrogens resulting in an increased risk of endometrial hyperplasia. Therefore, for chronically administered CYP3A4 inhibitors ( > 30 days) concurrently administered with DUAVEE, adequate diagnostic measures, including directed or random endometrial sampling when indicated by signs and symptoms of endometrial hyperplasia, should be undertaken to rule out malignancy in postmenopausal women with undiagnosed persistent or recurring abnormal genital bleeding. Bazedoxifene undergoes little or no cytochrome P450 (CYP)-mediated metabolism. Bazedoxifene does not induce or inhibit the activities of major CYP isoenzymes. In vitro data suggest that bazedoxifene is unlikely to interact with co-administered drugs via CYP-mediated metabolism. Uridine Diphosphate Glucuronosyltransferase (UGT) Bazedoxifene undergoes metabolism by UGT enzymes in the intestinal tract and liver. The metabolism of bazedoxifene may be increased by concomitant use of substances known to induce UGTs, such as rifampin, phenobarbital, carbamazepine, and phenytoin. A reduction in bazedoxifene exposure may be associated with an increase risk of endometrial hyperplasia. Adequate diagnostic measures, including directed or random endometrial sampling when indicated, should be undertaken to rule out malignancy in postmenopausal women with undiagnosed persistent or recurring abnormal genital bleeding. Atorvastatin Concomitant administration of bazedoxifene (40 mg daily) and atorvastatin (20 mg, single-dose) to healthy postmenopausal women did not affect the pharmacokinetics of bazedoxifene, atorvastatin or its active metabolites. Last reviewed on RxList: 11/7/2013
This monograph has been modified to include the generic and brand name in many instances.

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DUAVEE is indicated in women with a uterus for: Treatment of Moderate to Severe Vasomotor Symptoms Associated with Menopause Prevention of Postmenopausal Osteoporosis Important Limitations of Use
  • Use DUAVEE for the shortest duration consistent with treatment goals and risks for the individual woman. Postmenopausal women should be re-evaluated periodically as clinically appropriate to determine if treatment is still necessary.
  • When prescribing solely for the prevention of postmenopausal osteoporosis, therapy should only be considered for women at significant risk of osteoporosis and non-estrogen medication should be carefully considered.

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DUAVEE is contraindicated in women with any of the following conditions:
  • Undiagnosed abnormal uterine bleeding
  • Known, suspected, or past history of breast cancer
  • Known or suspected estrogen-dependent neoplasia
  • Active deep venous thrombosis, pulmonary embolism, or history of these conditions
  • Active arterial thromboembolic disease (for example, stroke, myocardial infarction) or history of these conditions
  • Hypersensitivity (for example, anaphylaxis, angioedema) to estrogens, bazedoxifene, or any ingredients
  • Known hepatic impairment or disease
  • Known protein C, protein S, or antithrombin deficiency or other known thrombophilic disorders
  • Pregnancy, women who may become pregnant, and nursing mothers. DUAVEE may cause fetal harm when administered to a pregnant woman. If this drug is used during pregnancy, or if the patient becomes pregnant while taking this drug, the patient should be apprised of the potential hazard to a fetus
Last reviewed on RxList: 11/7/2013
This monograph has been modified to include the generic and brand name in many instances.

Source: http://www.rxlist.com

In case of overdosage, there is no specific antidote, and the treatment should be symptomatic. Symptoms of overdosage of estrogen-containing products in adults and children may include nausea, vomiting, breast tenderness, dizziness, abdominal pain, drowsiness/fatigue; withdrawal bleeding may occur.

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Dosage Forms And Strengths DUAVEE (conjugated estrogens/bazedoxifene) tablets, 0.45 mg/20 mg are oval, biconvex, pink tablets, branded with “0.45/20” in black ink on one side. Storage And Handling DUAVEE tablets contain 0.45 mg conjugated estrogens and 20 mg bazedoxifene. The tablets are oval, biconvex, and pink, branded with “0.45/20” in black ink on one side. DUAVEE® tablets are supplied as follows:   Package NDC number Conjugated estrogens 0.45 mg/bazedoxifene 20 mg 2 blisters of 15 tablets each NDC 0008-1123-12 Storage Blisters DUAVEE tablets should be stored at 20°C to 25°C (68°F to 77°F); excursions permitted to 15°C to 30°C (59°F to 86°F). See USP Controlled Room Temperature. Dispense product in the original package. Tablets should not be removed from blisters until immediately before use. Protect from moisture. After opening foil pouch, product must be used within 60 days. This product's label may have been updated. For current full prescribing information, please visit www.pfizer.com. Distributed by: Wyeth Pharmaceuticals Inc., A subsidiary of Pfizer Inc., A subsidiary of Pfizer Inc Philadelphia, PA 19101. Revised October 2013 Last reviewed on RxList: 11/7/2013
This monograph has been modified to include the generic and brand name in many instances.

Source: http://www.rxlist.com

Drugs Containing Progestins, Estrogens or Estrogen Agonist/Antagonists DUAVEE contains conjugated estrogens and bazedoxifene, an estrogen agonist/antagonist. Women taking DUAVEE should not take progestins, additional estrogens or additional estrogen agonist/antagonists. Cardiovascular Disorders Estrogen agonist/antagonists (including bazedoxifene, a component of DUAVEE) and estrogens individually are known to increase the risk of VTE. An increased risk of stroke and DVT has been reported with estrogen-alone therapy. Should any of these occur or be suspected, DUAVEE should be discontinued immediately. Risk factors for arterial vascular disease (for example, hypertension, diabetes mellitus, tobacco use, hypercholesterolemia, and obesity) and/or VTE (for example, personal history or family history of VTE, obesity, and systemic lupus erythematosus) should be managed appropriately. Stroke In the WHI estrogen-alone substudy, a statistically significant increased risk of stroke was reported in women 50 to 79 years of age receiving daily conjugated estrogens (CE) (0.625 mg)- alone compared to women in the same age group receiving placebo (45 versus 33 per 10,000 women-years). The increase in risk was demonstrated in year 1 and persisted [see Clinical Studies]. Subgroup analyses of women 50 to 59 years of age suggest no increased risk of stroke for those women receiving conjugated estrogens (0.625 mg)-alone versus those receiving placebo (18 versus 21 per 10,000 women-years). Should a stroke occur or be suspected, DUAVEE should be discontinued immediately [see CONTRAINDICATIONS]. Coronary Heart Disease In the WHI estrogen-alone substudy, no overall effect on coronary heart disease (CHD) events (defined as nonfatal myocardial infarction, silent myocardial infarction, or CHD death) was reported in women receiving estrogen-alone compared to placebo [see Clinical Studies]. Subgroup analyses of women 50 to 59 years of age suggest a statistically non-significant reduction in CHD events (CE [0.625 mg]-alone compared to placebo) in women with less than 10 years since menopause (8 versus 16 per 10,000 women-years). Venous Thromboembolism (VTE) In the WHI estrogen-alone substudy, the risk of VTE [DVT and pulmonary embolism (PE)] was increased for women receiving daily conjugated estrogens (0.625 mg)-alone compared to placebo (30 versus 22 per 10,000 women-years), although only the increased risk of DVT reached statistical significance (23 versus 15 per 10,000 women-years). The increase in VTE risk was demonstrated during the first 2 years [see Clinical Studies]. If feasible, DUAVEE should be discontinued at least 4 to 6 weeks before surgery of the type associated with an increased risk of thromboembolism, or during periods of prolonged immobilization. Because immobilization increases the risk for venous thromboembolic events independent of therapy, DUAVEE should be discontinued prior to and during prolonged immobilization (e.g., post-surgical recovery, prolonged bed rest) and DUAVEE therapy should be resumed only after the patient is fully ambulatory. In addition, women taking DUAVEE should be advised to move about periodically during travel involving prolonged immobilization. Malignant Neoplasms Endometrial Cancer An increased risk of endometrial cancer has been reported with the use of unopposed estrogen therapy in women with a uterus. The reported endometrial cancer risk among unopposed estrogen users is about 2 to 12 times greater than in non-users, and appears dependent on duration of treatment and on estrogen dose. Most studies show no significant increased risk associated with use of estrogens for less than 1 year. The greatest risk appears associated with prolonged use, with increased risks of 15- to 24-fold for 5 to 10 years or more of treatment. This risk has been shown to persist for at least 8 to 15 years after estrogen therapy is discontinued. DUAVEE contains an estrogen agonist/antagonist. This component reduces the risk of endometrial hyperplasia that can occur with the conjugated estrogens component. Endometrial hyperplasia may be a precursor to endometrial cancer. Women taking DUAVEE should not take additional estrogens as this may increase the risk of endometrial hyperplasia. Clinical surveillance of all women taking DUAVEE is important. Adequate diagnostic measures, including directed or random endometrial sampling when indicated, should be undertaken to rule out malignancy in postmenopausal women with undiagnosed persistent or recurring abnormal genital bleeding. Breast Cancer The most important randomized clinical study providing information about breast cancer in estrogen-alone users is the WHI substudy of daily conjugated estrogens (0.625 mg)-alone. In the WHI estrogen-alone substudy, after an average follow-up of 7.1 years, daily conjugated estrogen (0.625 mg)-alone was not associated with an increased risk of invasive breast cancer (relative risk [RR] 0.80). The use of estrogen-alone has been reported to result in an increase in abnormal mammograms requiring further evaluation. The effect of treatment with DUAVEE on the risk of breast cancer is unknown. All women should receive yearly breast examinations by a healthcare provider and perform monthly breast self-examinations. In addition, mammography examinations should be scheduled based on patient age, risk factors, and prior mammogram results. Ovarian Cancer In some epidemiological studies, the use of estrogen-only products, in particular for 5 or more years, has been associated with an increased risk of ovarian cancer. However, the duration of exposure associated with increased risk is not consistent across all epidemiologic studies, and some report no association. The effect of treatment with DUAVEE on the risk of ovarian cancer is unknown. Probable Dementia In the WHIMS estrogen-alone ancillary study of WHI, a population of 2,947 hysterectomized women 65 to 79 years of age was randomized to daily CE (0.625 mg)-alone or placebo. After an average follow-up of 5.2 years, 28 women in the estrogen-alone group and 19 women in the placebo group were diagnosed with probable dementia. The relative risk of probable dementia for CE-alone versus placebo was 1.49 (95 percent CI, 0.83-2.66). The absolute risk of probable dementia for CE-alone versus placebo was 37 versus 25 cases per 10,000 women-years [see Use in Specific Populations and Clinical Studies]. Gallbladder Disease A 2- to 4-fold increase in the risk of gallbladder disease requiring surgery in postmenopausal women receiving estrogens has been reported. Visual Abnormalities Retinal vascular thrombosis has been reported in patients receiving estrogens. Discontinue medication pending examination if there is sudden partial or complete loss of vision, or a sudden onset of proptosis, diplopia, or migraine. If examination reveals papilledema or retinal vascular lesions, DUAVEE should be permanently discontinued. Elevated Blood Pressure In a small number of case reports in women receiving estrogens, substantial increases in blood pressure have been attributed to idiosyncratic reactions to estrogens. In a large, randomized, placebo-controlled clinical study, a generalized effect of estrogens on blood pressure was not seen. Hypertriglyceridemia In women with pre-existing hypertriglyceridemia, treatment with estrogens may be associated with elevations of plasma triglycerides leading to pancreatitis. Consider discontinuation of DUAVEE if pancreatitis occurs. Hepatic Impairment and Past History of Cholestatic Jaundice DUAVEE has not been studied in women with impaired liver function or past history of cholestatic jaundice. Estrogens may be poorly metabolized in women with impaired liver function. On average, women with hepatic impairment treated with bazedoxifene alone showed a 4.3-fold increase in overall exposures compared with controls [see Use In Specific Populations and CLINICAL PHARMACOLOGY]. For women with a history of cholestatic jaundice associated with past estrogen use or with pregnancy, caution should be exercised; and in the case of recurrence, DUAVEE should be discontinued. Use of DUAVEE in patients with hepatic impairment is contraindicated [see CONTRAINDICATIONS]. Hypothyroidism Estrogen administration leads to increased thyroid-binding globulin (TBG) levels. Women with normal thyroid function can compensate for the increased TBG by making more thyroid hormone, thus maintaining free T4 and T3 serum concentrations in the normal range. Women dependent on thyroid hormone replacement therapy who are also receiving estrogens may require increased doses of their thyroid replacement therapy. These women should have their thyroid function monitored in order to maintain their free thyroid hormone levels in an acceptable range. Fluid Retention Estrogens may cause some degree of fluid retention. Because of this, patients who have conditions that might be influenced by this factor, such as cardiac dysfunction or renal impairment, warrant careful observation when estrogens are prescribed. Use of DUAVEE in patients with renal impairment is not recommended [see Use in Specific Populations]. Hypocalcemia Estrogen therapy should be used with caution in women with hypoparathyroidism as estrogeninduced hypocalcemia may occur. Hereditary Angioedema Exogenous estrogens may exacerbate symptoms of angioedema in women with hereditary angioedema. Exacerbation of Other Conditions Estrogens may cause an exacerbation of asthma, diabetes mellitus, epilepsy, migraine or porphyria, systemic lupus erythematosus, and hepatic hemangiomas and should be used with caution in women with these conditions. Premenopausal Women There is no indication for premenopausal use of DUAVEE. The efficacy and safety of DUAVEE in premenopausal women have not been established, and its use is not recommended. Laboratory Tests Serum follicle stimulating hormone (FSH) and estradiol levels have not been shown to be useful in the management of moderate to severe vasomotor symptoms. Drug-Laboratory Test Interactions Accelerated prothrombin time, partial thromboplastin time, and platelet aggregation time; increased platelet count; increased factors II, VII antigen, VIII antigen, VIII coagulant activity, IX, X, XII, VII-X complex, II-VII-X complex, and beta-thromboglobulin; decreased levels of antifactor Xa and antithrombin III, decreased antithrombin III activity; increased levels of fibrinogen and fibrinogen activity; increased plasminogen antigen and activity. Increased thyroid-binding globulin (TBG) leading to increased circulating total thyroid hormone, as measured by protein-bound iodine (PBI), T4 levels (by column or by radioimmunoassay), or T3 levels by radioimmunoassay. T3 resin uptake is decreased, reflecting the elevated TBG. Free T4 and free T3 concentrations are unaltered. Women on thyroid replacement therapy may require higher doses of thyroid hormone. Other binding proteins may be elevated in serum, for example, corticosteroid binding globulin (CBG), sex hormone-binding globulin (SHBG), leading to increased total circulating corticosteroids and sex steroids, respectively. Free hormone concentrations, such as testosterone and estradiol, may be decreased. Other plasma proteins may be increased (angiotensinogen/renin substrate, alpha-1-antitrypsin, ceruloplasmin). Increased plasma high-density lipoprotein (HDL) and HDL2 cholesterol subfraction concentrations, reduced low-density lipoprotein (LDL) cholesterol concentrations, increased triglyceride levels. Impaired glucose tolerance. Patient Counseling Information See FDA-approved patient labeling (PATIENT INFORMATION). Instructions for Patients
  • Keep DUAVEE in the original container to protect from moisture. Do not place DUAVEE in pill boxes or pill organizers.
  • If more than one blister package is dispensed to the patient, instruct them to open one foil pouch at a time.
  • Instruct patient to record the date the blister package is opened in the space provided on the blister package label. Do not use if the blister package has been open more than 60 days.
  • Instruct patient to remove only one tablet from the blister package at the time of use.
Venous Thromboembolic Events Advise patients to immediately report to their physician any signs or symptoms related to venous thrombosis and thromboembolic events [see WARNINGS AND PRECAUTIONS]. Abnormal Vaginal Bleeding Inform postmenopausal women of the importance of reporting abnormal vaginal bleeding to their healthcare provider as soon as possible [see WARNINGS AND PRECAUTIONS]. Possible Serious Adverse Reactions with Estrogen Therapy Inform postmenopausal women of possible serious adverse reactions of estrogen therapy including Cardiovascular Disorders, Malignant Neoplasms, and Probable Dementia [see WARNINGS AND PRECAUTIONS]. Possible Less Serious Adverse Reactions with DUAVEE Inform postmenopausal women of possible less serious but common adverse reactions of DUAVEE therapy such as muscle spasms, nausea, diarrhea, dyspepsia, upper abdominal pain, throat pain, dizziness and neck pain. Calcium and Vitamin D Intake Advise patients to add supplemental calcium and/or vitamin D to the diet if daily intake is inadequate. Nonclinical Toxicology Carcinogenesis, Mutagenesis, Impairment of Fertility Carcinogenesis Carcinogenicity studies with conjugated estrogens/bazedoxifene have not been conducted. Long-term continuous administration of natural and synthetic estrogens in certain animal species increases the frequency of carcinomas of the breast, uterus, cervix, vagina, testis, and liver. In 6-month oral gavage carcinogenicity studies of bazedoxifene in transgenic Tg.RasH2 mice, there was a drug-related increased incidence of benign, ovarian granulosa-cell tumors in female mice given 150 or 500 mg/kg/day. In a two-year dietary carcinogenicity study of bazedoxifene in rats (administered at 0.003%, 0.01%, 0.03%, or 0.1%) a drug-related marked increased incidence of benign, ovarian granulosa-cell tumors was observed in female rats at concentrations of 0.03% and 0.1%. Systemic exposure (AUC) of bazedoxifene in these groups was 3 and 8 times that observed in postmenopausal women administered 20 mg/day. In male rats, drug-related renal tumors (adenomas and carcinomas), in the presence of renal toxicity, were observed at all doses tested, which corresponded to exposure ratios of 0.06 to 5 times the clinical AUC at a dose of 20 mg. Mutagenesis Mutagenicity studies with conjugated estrogens/bazedoxifene have not been conducted. Bazedoxifene was not genotoxic or mutagenic in a battery of tests, including in vitro bacterial reverse mutation assay, in vitro mammalian cell forward mutation assay at the thymidine kinase (TK+/-) locus in L5178Y mouse lymphoma cells, in vitro chromosome aberration assay in Chinese hamster ovary (CHO) cells, and in vivo mouse micronucleus assay. Impairment of Fertility Impairment of fertility studies with conjugated estrogens/bazedoxifene have not been conducted. Female rats were administered daily dosages of 0.3 to 30 mg/kg bazedoxifene (0.03 to 10 times human AUC at the 20 mg dose) prior to and during mating with untreated males. Estrous cycles and fertility were adversely affected in all bazedoxifene-treated female groups. Use In Specific Populations Pregnancy Pregnancy Category X [see CONTRAINDICATIONS] DUAVEE must not be used in women who are or may become pregnant. No studies were performed on animals to evaluate the effects on reproduction with conjugated estrogens/bazedoxifene. Administration of bazedoxifene to rats at maternally toxic dosages ≥ 1 mg/kg/day ( ≥ 0.3 times the human area under the curve (AUC) at the 20 mg dose) resulted in reduced numbers of live fetuses and/or reductions in fetal body weights. No fetal developmental anomalies were observed. In studies conducted with pregnant rabbits treated with bazedoxifene, abortion and an increased incidence of heart (ventricular septal defect) and skeletal system (ossification delays, misshapen or misaligned bones, primarily of the spine and skull) anomalies in the fetuses were present at maternally toxic dosages of ≥ 0.5 mg/kg/day (2 times the human AUC at the 20 mg dose). Nursing Mothers DUAVEE should not be used by lactating women [see CONTRAINDICATIONS]. It is not known whether this drug is excreted in human milk. Detectable amounts of estrogens have been identified in the milk of mothers receiving conjugated estrogens. Estrogen administration to nursing mothers has been shown to decrease the quantity and quality of the milk. Pediatric Use DUAVEE is not indicated for use in children [see INDICATIONS AND USAGE]. Geriatric Use DUAVEE is not recommended for use in women greater than 75 years of age [see DOSAGE AND ADMINISTRATION and CLINICAL PHARMACOLOGY]. Of the total number of women in phase 3 clinical studies who received DUAVEE, 4.60% (n=224) were 65 years and over. DUAVEE was not studied in women aged 75 and over. No overall differences in safety or effectiveness were observed between women 65-74 years of age and younger women, and other reported clinical experience has not identified differences in responses between the elderly and younger women, but greater sensitivity of some older women cannot be ruled out. An increased risk of probable dementia in women over 65 years of age was reported in the Women's Health Initiative Memory ancillary studies of the Women's Health Initiative using daily conjugated estrogens (0.625 mg) [see Clinical Studies]. Renal Impairment DUAVEE is not recommended for use in patients with renal impairment [see DOSAGE AND ADMINISTRATION and CLINICAL PHARMACOLOGY]. The pharmacokinetics, safety, and efficacy of DUAVEE have not been evaluated in women with renal impairment. Hepatic Impairment DUAVEE is contraindicated in patients with hepatic impairment [see CONTRAINDICATIONS and CLINICAL PHARMACOLOGY]. The pharmacokinetics, safety, and efficacy of DUAVEE have not been evaluated in women with hepatic impairment. In a pharmacokinetics study of bazedoxifene 20 mg alone, the Cmax and AUC of bazedoxifene increased 67% and 143%, respectively, in women with mild hepatic impairment (Child Pugh Class A), compared to healthy women. The Cmax and AUC of bazedoxifene increased 32% and 109%, respectively, in women with moderate hepatic impairment (Child Pugh Class B). The Cmax and AUC of bazedoxifene increased 20% and 268%, respectively, in women with severe hepatic impairment (Child Pugh Class C). No pharmacokinetic studies with conjugated estrogens were conducted in women with hepatic impairment. Use in Women with Body Mass Index (BMI) > 27 kg/m² A 17% reduction in bazedoxifene exposure was predicted in women with BMI > 27 kg/m² (N=144) compared to those with BMI ≤ 27 kg/m² (N=93) after administration of DUAVEE, based on a population pharmacokinetic model using data from four Phase 1 studies. A reduction in bazedoxifene exposure may be associated with an increased risk of endometrial hyperplasia. Regardless of BMI, adequate diagnostic measures, including directed or random endometrial sampling when indicated, should be undertaken to rule out malignancy in postmenopausal women with undiagnosed persistent or recurring abnormal genital bleeding. Last reviewed on RxList: 11/7/2013
This monograph has been modified to include the generic and brand name in many instances.

Source: http://www.rxlist.com

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