Estradiol

1 INDICATIONS AND USAGE ESTRADIOL TRANSDERMAL SYSTEM is indicated for: ESTRADIOL TRANSDERMAL SYSTEM is an estrogen indicated for: Treatment of moderate to severe vasomotor symptoms due to menopause ( 1.1 ) Prevention of postmenopausal osteoporosis ( 1.2 ) Limitation of Use When prescribing solely for the treatment of postmenopausal osteoporosis, first consider the use of non-estrogen medications. Consider estrogen therapy only for women at significant risk of osteoporosis. 1.1 Treatment of Moderate to Severe Vasomotor Symptoms Due to Menopause 1.2 Prevention of Postmenopausal Osteoporosis Limitation of Use When prescribing solely for the prevention of postmenopausal osteoporosis, first consider the use of non-estrogen medications. Consider estrogen therapy only for women at significant risk of osteoporosis.

2 DOSAGE AND ADMINISTRATION Generally, when estrogen is prescribed for a postmenopausal woman with a uterus, consider addition of a progestogen to reduce the risk of endometrial cancer. Generally, a woman without a uterus, does not need a progestogen in addition to her estrogen therapy. In some cases, however, hysterectomized women who have a history of endometriosis may need a progestogen [see Warnings and Precautions ( 5.2 , 5.14 )] . Use of estrogen-alone, or in combination with a progestogen, at the lowest effective dose and for the shortest duration consistent with treatment goals and risks for the individual woman. Reevaluate postmenopausal women periodically as clinically appropriate to determine if treatment is still necessary. Start therapy with ESTRADIOL TRANSDERMAL SYSTEM 0.0375 mg per day applied to the skin twice weekly for the treatment of moderate to severe vasomotor symptoms due to menopause. Dosage adjustment should be guided by the clinical response ( 2.1 ) Start therapy with ESTRADIOL TRANSDERMAL SYSTEM 0.025 mg per day applied to the skin twice weekly for the prevention of postmenopausal osteoporosis. The dose may be adjusted as necessary ( 2.2 ) Place ESTRADIOL TRANSDERMAL SYSTEM on a clean, dry area on the lower abdomen (below the umbilicus) or buttocks. Do not apply ESTRADIOL TRANSDERMAL SYSTEM to the breasts ( 2.3 ) 2.1 Treatment of Moderate to Severe Vasomotor Symptoms due to Menopause Start therapy with ESTRADIOL TRANSDERMAL SYSTEM 0.0375 mg per day applied to the skin twice weekly. Make dosage adjustments based on clinical response. Attempt to taper or discontinue the medication at 3 to 6 month intervals. 2.2 Prevention of Postmenopausal Osteoporosis due to Menopause 2.3 Application Instructions Place the adhesive side of ESTRADIOL TRANSDERMAL SYSTEM on a clean, dry area on the lower abdomen (below the umbilicus) or buttocks. Do not apply ESTRADIOL TRANSDERMAL SYSTEM to the breasts. Replace ESTRADIOL TRANSDERMAL SYSTEM twice weekly (every 3-4 days). Rotate the sites of application, with an interval of at least 1 week allowed between applications to a particular site. Select an area for application that is not oily, damaged, or irritated. Avoid the waistline, since tight clothing may rub the system off. Apply the system immediately after opening the pouch and removing the protective liner. Press the system firmly in place with the palm of the hand for about 10 seconds, making sure there is good contact with the skin, especially around the edges. In the event that a system falls off, reapply the same system or apply a new system to another location. If a woman has forgotten to apply ESTRADIOL TRANSDERMAL SYSTEM, have her apply a new system as soon as possible. Apply the new system on the original treatment schedule. The interruption of treatment in women taking ESTRADIOL TRANSDERMAL SYSTEM might increase the likelihood of breakthrough bleeding, spotting and recurrence of symptoms.

5 WARNINGS AND PRECAUTIONS Estrogens increase the risk of gallbladder disease ( 5.4 ) Discontinue estrogen if severe hypercalcemia, loss of vision, severe hypertriglyceridemia or cholestatic jaundice occurs ( 5.5 , 5.6 , 5.9 , 5.10 ) Monitor thyroid function in women on thyroid replacement therapy ( 5.11 , 5.18 ) 5.1 Cardiovascular Disorders Increased risks of stroke and DVT are reported with estrogen-alone therapy. Increased risks of PE, DVT, stroke and MI are reported with estrogen plus progestin therapy. Immediately discontinue estrogen with or without progestogen therapy if any of these occur or are suspected. Manage appropriately any risk factors for arterial vascular disease (for example, hypertension, diabetes mellitus, tobacco use, hypercholesterolemia, and obesity) and/or venous thromboembolism (VTE) (for example, personal history or family history of VTE, obesity, and systemic lupus erythematosus). Stroke The WHI estrogen-alone substudy reported a statistically significant increased risk of stroke in women 50 to 79 years of age receiving daily CE (0.625 mg)-alone compared to women in the same age group receiving placebo (45 versus 33 per 10,000 women-years, respectively). The increase in risk was demonstrated in year 1 and persisted [see Clinical Studies ( 14.3 )] . Immediately discontinue estrogen-alone therapy if a stroke occurs or is suspected. Subgroup analyses of women 50 to 59 years of age suggest no increased risk of stroke for those women receiving CE (0.625 mg)-alone versus those receiving placebo (18 versus 21 per 10,000 women-years). 1 In WHI estrogen plus progestin substudy reported a statistically significant increased risk of stroke in women 50 to 79 years of age receiving CE (0.625 mg) plus MPA (2.5 mg) compared to women in the same age group receiving placebo (33 versus 25 strokes per 10,000 women-years, respectively) [see Clinical Studies ( 14.3 )] . The increase in risk was demonstrated after the first year and persisted. 1 Immediately discontinue estrogen plus progestogen therapy if a stroke occur or is suspected. Subgroup analyses of women 50 to 59 years of age suggest no increased risk of stroke for those women receiving CE (0.625 mg)-alone versus those receiving placebo (18 versus 21 per 10,000 women-years). 1 The WHI estrogen plus progestin substudy reported a statistically significant increased risk of stroke in women 50 to 79 years of age receiving CE (0.625 mg) plus MPA (2.5 mg) compared to women in the same age group receiving placebo (33 versus 25 strokes per 10,000 women-years) [see Clinical Studies, ( 14.3 )] . The increase in risk was demonstrated after the first year and persisted. 1 Immediately discontinue estrogen plus progestogen therapy if a stroke occurs or is suspected. Coronary Heart Disease The WHI estrogen-alone substudy reported no overall effect on coronary heart disease (CHD) events (defined as nonfatal MI, silent MI, or CHD death) in women receiving estrogen-alone compared to placebo2 [see Clinical Studies ( 14.3 )] . Subgroup analyses of women 50 to 59 years of age, who were less than 10 years since menopause, suggest a reduction (not statistically significant) of CHD events in those women receiving daily CE(0.625 mg)-alone compared to placebo(8 versus 16 per 10,000 women-years). 1 The WHI estrogen plus progestin substudy reported an increased risk (not statistically significant) of CHD events reported in women receiving daily CE (0.625 mg) plus MPA (2.5 mg) compared to women receiving placebo (41 versus 34 per 10,000 women years). 1 An increase in relative risk was demonstrated in year 1, and a trend toward decreasing relative risk was reported in years 2 through 5 [see Clinical Studies ( 14.3 )] . In postmenopausal women with documented heart disease (n = 2,763, average 66.7 years of age), in a controlled clinical trial of secondary prevention of cardiovascular disease (Heart and Estrogen/Progestin Replacement Study; HERS), treatment with daily CE (0.625 mg) plus MPA (2…

4 CONTRAINDICATIONS ESTRADIOL TRANSDERMAL SYSTEM is contraindicated in women with any of the following conditions: Undiagnosed abnormal genital bleeding [See Warnings and Precautions ( 5.2 )] . Breast cancer or a history of breast cancer [See Warnings and Precautions ( 5.2 )] . Estrogen-dependent neoplasia [See Warnings and Precautions ( 5.2 )] . Active DVT, PE, or a history of these conditions [See Warnings and Precautions ( 5.1 )] . Active arterial thromboembolic disease (for example, stroke and MI), or a history of these conditions [See Warnings and Precautions ( 5.1 )] . Known anaphylactic reaction or angioedema or hypersensitivity to ESTRADIOL TRANSDERMAL SYSTEM Hepatic impairment or disease Protein C, protein S, or antithrombin deficiency, or other known thrombophilic disorders Undiagnosed abnormal genital bleeding ( 4 , 5.2 ) Breast cancer or a history of breast cancer ( 4 , 5.2 ) Estrogen-dependent neoplasia ( 4 , 5.2 ) Active DVT, PE, or a history of these conditions ( 4 , 5.1 ) Active arterial thromboembolic disease (for example, stroke or MI), or a history of these conditions ( 4 , 5.1 ) Known anaphylactic reaction, angioedema, or hypersensitivity to ESTRADIOL TRANSDERMAL SYSTEM( 4 ) Hepatic impairment or disease ( 4 , 5.10 ) Protein C, protein S, or antithrombin deficiency, or other known thrombophilic disorders( 4 )

7 DRUG INTERACTIONS 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 plasma concentrations of estrogens and may result in adverse reactions. Inducers and/or inhibitors of CYP3A4 may affect estrogen drug metabolism and decrease or increase the estrogen plasma concentration. ( 7.1 )

8.1 Pregnancy Risk Summary ESTRADIOL TRANSDERMAL SYSTEM is not indicated for use in pregnancy. There are no data with the use of ESTRADIOL TRANSDERMAL SYSTEM in pregnant women; however, epidemiologic studies and meta-analyses have not found an increased risk of genital or nongenital birth defects (including cardiac anomalies and limb-reduction defects) following exposure to combined hormonal contraceptives (estrogens and progestins) before conception or during early pregnancy. In the U.S. general population, the estimated background risk of major birth defects and miscarriage in clinically recognized pregnancies is 2% to 4% and 15% to 20%, respectively.

6 ADVERSE REACTIONS The following serious adverse reactions are discussed elsewhere in labeling: Cardiovascular Disorders [see Boxed Warnings and Warnings and Precautions ( 5.1 )] Malignant Neoplasms [see Boxed Warnings and Warnings and Precautions ( 5.2 )] The most common adverse reactions (greater than or equal to 5 percent) with ESTRADIOL TRANSDERMAL SYSTEM are: headache, breast tenderness, back pain, pain in limb, nasopharyngitis, dyspepsia, nausea, sinusitis, and intermenstrual bleeding ( 6.1 ) To report SUSPECTED ADVERSE REACTIONS, contact Noven at 1-800-455-8070 or FDA at 1-800-FDA-1088 or www.fda.gov/medwatch 6.1 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 practice. There were no clinical trials conducted with ESTRADIOL TRANSDERMAL SYSTEM. ESTRADIOL TRANSDERMAL SYSTEM is bioequivalent to Vivelle ® . The following adverse reactions are reported with Vivelle therapy: Table 1: Summary of Most Frequently Reported Adverse Reactions (Vivelle versus Placebo) Regardless of Relationship Reported at a Frequency ≥ 5 Percent †Represents milligrams of estradiol delivered daily by each system *NOS represents not otherwise specified **NEC represents not elsewhere classified ***Application site erythema and application site irritation were observed in 3.2% or less of patients across treatment groups. Vivelle 0.025 mg/ day† (N=47) N (%) Vivelle 0.0375 mg/ day† (N=130) N (%) Vivelle 0.05 mg/ day† (N=103) N (%) Vivelle 0.075 mg/ day† (N=46) N (%) Vivelle 0.1 mg/ day† (N=132) N (%) Placebo (N=157) N (%) Gastrointestinal disorders Constipation 2 (4.3) 5 (3.8) 4 (3.9) 3 (6.5) 2 (1.5) 4 (2.5) Dyspepsia 4 (8.5) 12 (9.2) 3 (2.9) 2 (4.3) 0 10 (6.4) Nausea 2 (4.3) 8 (6.2) 4 (3.9) 0 7 (5.3) 5 (3.2) General disorders and administration site conditions *** Influenza-like illness 3 (6.4) 6 (4.6) 8 (7.8) 0 3 (2.3) 10 (6.4) Pain NOS * 0 8 (6.2) 0 2 (4.3) 7 (5.3) 7 (4.5) Infections and infestations Influenza 4 (8.5) 4 (3.1) 6 (5.8) 0 10 (7.6) 14 (8.9) Nasopharyngitis 3 (6.4) 16 (12.3) 10 (9.7) 9 (19.6) 11 (8.3) 24 (15.3) Sinusitis NOS * 4 (8.5) 17 (13.1) 13 (12.6) 3 (6.5) 7 (5.3) 16 (10.2) Upper respiratory tract infection NOS * 3 (6.4) 8 (6.2) 11 (10.7) 4 (8.7) 6 (4.5) 9 (5.7) Investigations Weight increased 4 (8.5) 5 (3.8) 2 (1.9) 2 (4.3) 0 3 (1.9) Musculoskeletal and connective tissue disorders Arthralgia 0 11 (8.5) 4 (3.9) 2 (4.3) 5 (3.8) 9 (5.7) Back pain 4 (8.5) 10 (7.7) 9 (8.7) 4 (8.7) 14 (10.6) 10 (6.4) Neck pain 3 (6.4) 4 (3.1) 4 (3.9) 0 6 (4.5) 2 (1.3) Pain in limb 0 10 (7.7) 7 (6.8) 2 (4.3) 6 (4.5) 9 (5.7) Nervous system disorders Headache NOS * 7 (14.9) 35 (26.9) 32 (31.1) 23 (50.0) 34 (25.8) 37 (23.6) Sinus headache 0 12 (9.2) 5 (4.9) 5 (10.9) 2 (1.5) 8 (5.1) Psychiatric disorders Anxiety NEC ** 3 (6.4) 5 (3.8) 0 0 2 (1.5) 4 (2.5) Depression 5 (10.6) 4 (3.1) 7 (6.8) 0 4 (3.0) 6 (3.8) Insomnia 3 (6.4) 6 (4.6) 4 (3.9) 2 (4.3) 2 (1.5) 9 (5.7) Reproductive system and breast disorders Breast tenderness 8 (17.0) 10 (7.7) 8 (7.8) 3 (6.5) 17 (12.9) 0 Dysmenorrhea 0 0 0 3 (6.5) 0 0 Intermenstrual bleeding 3 (6.4) 9 (6.9) 6 (5.8) 0 14 (10.6) 7 (4.5) Respiratory, thoracic and mediastinal disorders Sinus congestion 0 4 (3.1) 3 (2.9) 3 (6.5) 6 (4.5) 7 (4.5) Vascular disorders Hot flushes NOS * 3 (6.4) 0 3 (2.9) 0 0 6 (3.8) Hypertension NOS * 2 (4.3) 0 3 (2.9) 0 0 2 (1.3) During the clinical pharmacology studies with ESTRADIOL TRANSDERMAL SYSTEM, 35 percent or less of subjects experienced barely perceptible erythema. No transdermal systems were removed due to irritation. Three subjects (2.2 percent) reported mild discomfort while wearing ESTRADIOL TRANSDERMAL SYSTEM (N=136). 6.2 Postmarketing Experience The following adverse reactions have been identified during post-approval use of ESTRADIOL TRANSDERMAL SYSTEM. Because …