Femara
letrozole · Tablet, Film Coated · Oral
Uses
Femara is an aromatase inhibitor indicated for: Adjuvant treatment of postmenopausal women with hormone receptor positive early breast cancer. ( 1.1 ) Extended adjuvant treatment of postmenopausal women with early breast cancer who have received prior standard adjuvant tamoxifen therapy. ( 1.2 ) First and second-line treatment of postmenopausal women with hormone receptor positive or unknown advanced breast cancer. ( 1.3 ) 1.1 Adjuvant Treatment of Early Breast Cancer Femara (letrozole) is indicated for the adjuvant treatment of postmenopausal women with hormone receptor positive early breast cancer. 1.2 Extended Adjuvant Treatment of Early Breast Cancer Femara is indicated for the extended adjuvant treatment of early breast cancer in postmenopausal women, who have received 5 years of adjuvant tamoxifen therapy. The effectiveness of Femara in extended adjuvant treatment of early breast cancer is based on an analysis of disease-free survival (DFS) in patients treated with Femara for a median of 60 months [see Clinical Studies (14.2, 14.3)] . 1.3 First and Second-Line Treatment of Advanced Breast Cancer Femara is indicated for first-line treatment of postmenopausal women with hormone receptor positive or unknown, locally advanced or metastatic breast cancer. Femara is also indicated for the treatment of advanced breast cancer in postmenopausal women with disease progression following antiestrogen therapy [see Clinical Studies (14.4, 14.5)].
Dosage and administration
Femara tablets are taken orally without regard to meals ( 2 ): Recommended dose: 2.5 mg once daily. ( 2.1 ) Patients with cirrhosis or severe hepatic impairment: 2.5 mg every other day. ( 2.5 , 5.3 ) 2.1 Recommended Dose The recommended dose of Femara is one 2.5 mg tablet administered once a day, without regard to meals. 2.2 Use in Adjuvant Treatment of Early Breast Cancer In the adjuvant setting, the optimal duration of treatment with letrozole is unknown. In both the adjuvant study and the post approval adjuvant study, median treatment duration was 5 years. Treatment should be discontinued at relapse [ see Clinical Studies (14.1) ] . 2.3 Use in Extended Adjuvant Treatment of Early Breast Cancer In the extended adjuvant setting, the optimal treatment duration with Femara is not known. The planned duration of treatment in the study was 5 years. In the final updated analysis, conducted at a median follow-up of 62 months, the median treatment duration for Femara was 60 months. Seventy-one percent (71%) of patients were treated for at least 3 years and 58% of patients completed at least 4.5 years of extended adjuvant treatment. The treatment should be discontinued at tumor relapse [see Clinical Studies (14.2)] . 2.4 Use in First and Second-Line Treatment of Advanced Breast Cancer In patients with advanced disease, treatment with Femara should continue until tumor progression is evident [see Clinical Studies (14.4, 14.5)] . 2.5 Use in Hepatic Impairment No dosage adjustment is recommended for patients with mild to moderate hepatic impairment, although Femara blood concentrations were modestly increased in subjects with moderate hepatic impairment due to cirrhosis. The dose of Femara in patients with cirrhosis and severe hepatic dysfunction should be reduced by 50% [see Warnings and Precautions (5. 3 ) ] . The recommended dose of Femara for such patients is 2.5 mg administered every other day. The effect of hepatic impairment on Femara exposure in noncirrhotic cancer patients with elevated bilirubin levels has not been determined. 2.6 Use in Renal Impairment No dosage adjustment is required for patients with renal impairment if creatinine clearance is greater than or equal to 10 mL/min [ s ee Clinical Pharmacology (12.3) ] .
Dosage forms and strengths
2.5 mg tablets: dark yellow, film-coated, round, slightly biconvex, with beveled edges (imprinted with the letters ‘FV’ on one side and ‘CG’ on the other side). 2.5 mg tablets. ( 3 )
Contraindications
Pregnancy: Letrozole can cause fetal harm [see Use in Specific Populations (8.1)] . Known hypersensitivity to the active substance, or to any of the excipients [see Adverse Reactions (6)] . Pregnancy. ( 4 ) Known hypersensitivity to the active substance, or to any of the excipients. ( 4 )
Warnings and precautions
Decreases in bone mineral density may occur. Consider bone mineral density monitoring. ( 5.1 ) Increases in total cholesterol may occur. Consider cholesterol monitoring. ( 5.2 ) Fatigue, dizziness, and somnolence may occur. Exercise caution when operating machinery. ( 5.4 ) Embryo-Fetal Toxicity: Can cause fetal harm when administered to pregnant women. Obtain a pregnancy test in females of reproductive potential. Advise females of reproductive potential to use effective contraception. ( 5.6 , 8.1 , 8.3 ) 5.1 Bone Effects Use of Femara may cause decreases in bone mineral density (BMD). Consideration should be given to monitoring BMD. Results of a safety study to evaluate safety in the adjuvant setting comparing the effect on lumbar spine (L2-L4) BMD of adjuvant treatment with letrozole to that with tamoxifen showed at 24 months a median decrease in lumbar spine BMD of 4.1% in the letrozole arm compared to a median increase of 0.3% in the tamoxifen arm (difference = 4.4%) ( P < 0.0001) [ s ee Adverse Reactions (6)] . Updated results from the BMD substudy (MA-17B) in the extended adjuvant setting demonstrated that at 2 years patients receiving letrozole had a median decrease from baseline of 3.8% in hip BMD compared to a median decrease of 2.0% in the placebo group. The changes from baseline in lumbar spine BMD in letrozole and placebo treated groups were not significantly different [see Adverse Reactions (6)]. In the adjuvant trial (BIG 1-98) the incidence of bone fractures at any time after randomization was 14.7% for letrozole and 11.4% for tamoxifen at a median follow-up of 96 months. The incidence of osteoporosis was 5.1% for letrozole and 2.7% for tamoxifen [ s ee Adver se R eactions (6)] . In the extended adjuvant trial (MA-17), the incidence of bone fractures at any time after randomization was 13.3% for letrozole and 7.8% for placebo at a median follow-up of 62 months. The incidence of new osteoporosis was 14.5% for letrozole and 7.8% for placebo [ s ee Adverse Reactions (6) ] . 5.2 Cholesterol Consideration should be given to monitoring serum cholesterol. In the adjuvant trial (BIG 1-98), hypercholesterolemia was reported in 52.3% of letrozole patients and 28.6% of tamoxifen patients. Grade 3-4 hypercholesterolemia was reported in 0.4% of letrozole patients and 0.1% of tamoxifen patients. Also in the adjuvant setting, an increase of greater than or equal to 1.5 x upper limit of normal (ULN) in total cholesterol (generally nonfasting) was observed in patients on monotherapy who had baseline total serum cholesterol within the normal range (i.e., less than = 1.5 x ULN) in 155/1843 (8.4%) patients on letrozole vs 71/1840 (3.9%) patients on tamoxifen Lipid lowering medications were required for 29% of patients on letrozole and 20% on tamoxifen [ s ee Adverse R eactions (6)]. 5.3 Hepatic Impairment Subjects with cirrhosis and severe hepatic impairment who were dosed with 2.5 mg of Femara experienced approximately twice the exposure to Femara as healthy volunteers with normal liver function [see Clinical Pharmacology ( 12.3 ) ] . Therefore, a dose reduction is recommended for this patient population. The effect of hepatic impairment on Femara exposure in cancer patients with elevated bilirubin levels has not been determined [ see Dosage and Administration (2. 5 ) ] . 5.4 Fatigue and Dizziness Because fatigue, dizziness, and somnolence have been reported with the use of Femara, caution is advised when driving or using machinery until it is known how the patient reacts to Femara use. 5.5 Laboratory Test Abnormalities No dose-related effect of Femara on any hematologic or clinical chemistry parameter was evident. Moderate decreases in lymphocyte counts, of uncertain clinical significance, were observed in some patients receiving Femara 2.5 mg. This depression was transient in about half of those affected. Two patients on Femara developed thrombocytopenia; relationship to the study drug was unclear. Patient withdrawal due to laboratory abnormalities, whether related to study treatment or not was infrequent. 5.6 Embryo-Fetal Toxicity Based on post-marketing reports, findings from animal studies and the mechanism of action, Femara can cause fetal harm and is contraindicated for use in pregnant women. In post-marketing reports, use of letrozole during pregnancy resulted in cases of spontaneous abortions and congenital birth defects. Letrozole caused embryo-fetal toxicities in rats and rabbits at maternal exposures that were below the maximum recommended human dose (MHRD) on a mg/m 2 basis. Advise pregnant women of the potential risk to a fetus. Advise females of reproductive potential to use effective contraception during therapy with Femara and for at least 3 weeks after the last dose [see Adverse Reactions (6.2), Use in Specific Populations (8.1, 8.3), and Clinical Pharmacology (12.1)] .
Side effects
The following adverse reactions are discussed in greater detail in other sections of the labeling. Bone effects [see Warnings and Precautions (5.1)] Increases in cholesterol [see Warnings and Precautions (5.2)] Fatigue and Dizziness [see Warnings and Precautions (5.4)] The most common adverse reactions (greater than 20%) were hot flashes, arthralgia; flushing, asthenia, edema, arthralgia, headache, dizziness, hypercholesterolemia, sweating increased, bone pain; and musculoskeletal. ( 6 ) To report SUSPECTED ADVERSE REACTIONS, contact Novartis Pharmaceuticals Corporation at 1-888-669-6682 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 reactions 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. Adjuvant Treatment of Early Breast Cancer In study, BIG 1-98, the median treatment duration of adjuvant treatment was 60 months and the median duration of follow-up for safety was 96 months for patients receiving Femara and tamoxifen. Certain adverse reactions were prospectively specified for analysis (see Table 1), based on the known pharmacologic properties and side effect profiles of the two drugs. Adverse reactions were analyzed irrespective of whether a symptom was present or absent at baseline. Most adverse reactions reported (approximately 75% of patients who reported AEs) were Grade 1 or Grade 2 applying the Common Toxicity Criteria (CTC) Version 2.0/Common Terminology Criteria for Adverse Events (CTCAE), Version 3.0. Table 1 describes adverse reactions (Grades 1-4 and Grades 3-4) irrespective of relationship to study treatment in the adjuvant trial for the monotherapy arms analysis (safety population). Table 1: Patients With Adverse Reactions (CTC Grades 1-4) in the Adjuvant Study – Monotherapy Arms Analysis (Median Follow-up 96 Months; Median Treatment 60 Months) Grades 1-4 Grades 3-4 Femara Tamoxifen Femara Tamoxifen Adverse R eaction s N = 2448 N = 2447 N = 2448 N = 2447 n (%) n (%) n (%) n (%) Patients with any adverse reaction 2309 (94.3) 2212 (90.4) 636 (26.0) 606 (24.8) Hypercholesterolemia* 1280 (52.3) 700 (28.6) 11 (0.4) 6 (0.2) Hot flashes* 819 (33.5) 929 (38.0) - - - - Arthralgia/arthritis* 621 (25.4) 504 (20.6) 84 (3.4) 50 (2.0) Bone fractures 1 361 (14.7) 280 (11.4) - - - - Night sweats* 356 (14.5) 426 (17.4) - - - - Weight increase* 317 (12.9) 378 (15.4) 27 (1.1) 39 (1.6) Nausea* 284 (11.6) 277 (11.3) 6 (0.2) 9 (0.4) Bone fractures** 2 249 (10.2) 175 (7.2) - - - - Fatigue (lethargy, malaise, asthenia)* 235 (9.6) 250 (10.2) 6 (0.2) 7 (0.3) Myalgia* 221 (9.0) 212 (8.7) 18 (0.7) 14 (0.6) Vaginal bleeding* 129 (5.3) 320 (13.1) 1 (< 0.1) 8 (0.3) Edema* 164 (6.7) 160 (6.5) 3 (0.1) 1 (< 0.1) Weight decrease 140 (5.7) 129 (5.3) 8 (0.3) 5 (0.2) Osteoporosis** 126 (5.1) 67 (2.7) 10 (0.4) 5 (0.2) Back pain 125 (5.1) 136 (5.6) 7 (0.3) 11 (0.4) Bone pain 123 (5.0) 109 (4.5) 6 (0.2) 4 (0.2) Depression 119 (4.9) 114 (4.7) 16 (0.7) 14 (0.6) Vaginal irritation* 112 (4.6) 77 (3.1) 2 (< 0.1) 2 (< 0.1) Headache* 105 (4.3) 94 (3.8) 8 (0.3) 4 (0.2) Pain in extremity 103 (4.2) 79 (3.2) 6 (0.2) 4 (0.2) Osteopenia* 87 (3.6) 76 (3.1) 0 - 3 (0.1) Dizziness/light-headedness* 84 (3.4) 80 (3.3) 1 (< 0.1) 6 (0.2) Alopecia 83 (3.4) 84 (3.4) - - - - Vomiting* 80 (3.3) 80 (3.3) 3 (0.1) 5 (0.2) Cataract* 49 (2.0) 54 (2.2) 16 (0.7) 17 (0.7) Constipation* 49 (2.0) 71 (2.9) 3 (0.1) 1 (< 0.1) Myocardial infarction 1 42 (1.7) 28 (1.1) - - - - Breast pain* 37 (1.5) 43 (1.8) 1 (< 0.1) - - Anorexia* 20 (0.8) 20 (0.8) 1 (< 0.1) 1 (< 0.1) Endometrial proliferation disorders* 14 (0.6) 86 (3.5) 0 - 14 (0.6) Ovarian cyst* 11 (0.4) 18 (0.7) 4 (0.2) 4 (0.2) Endometrial hyperplasia/cancer** 1 11 (0.4) 72 (2.9) - - - - Endometrial hyperplasia/cancer** , 3 6/1909 (0.3) 57/1943 (2.9) - - - - Other endometrial disorders* 2 (< 0.1) 3 (0.1) 0 - 0 - Myocardial infarction** 2 24 (1.0) 12 (0.5) - - - - Myocardial ischemia 6 (0.2) 9 (0.4) - - - - Cerebrovascular accident/TIA** 1 74 (3.0) 68 (2.8) - - - - Cerebrovascular accident/TIA** 2 51 (2.1) 47 (1.9) - - - - Angina requiring surgery** 1 35 (1.4) 33 (1.3) - - - - Angina requiring surgery** 2 25 (1.0) 25 (1.0) - - - - Thromboembolic event** 1 79 (3.2) 113 (4.6) - - - - Thromboembolic event** 2 51 (2.1) 89 (3.6) - - - - Cardiac failure 1 39 (1.6) 34 (1.4) - - - - Cardiac failure 2 27 (1.1) 15 (0.6) - - - - Hypertension 1 160 (6.5) 175 (7.2) - - - - Hypertension 2 138 (5.6) 139 (5.7) - - - - Other cardiovascular** 1 172 (7.0) 174 (7.1) - - - - Other cardiovascular** 2 120 (4.9) 119 (4.9) - - - - Second primary malignancy 1 129 (5.3) 150 (6.1) - - - - Second primary malignancy 2 54 (2.2) 79 (3.2) - - - - *Target events pre-specified for analysis **Events pre-printed on CRF 1 At median follow-up of 96 months (i.e., any time after randomization) for Femara (range up to 144 months) and 95 months for tamoxifen (range up to 143 months). 2 At median treatment duration of 60 months (i.e. during treatment + 30 days after discontinuation of treatment) for Femara and tamoxifen (range up to 68 months). 3 Excluding women who had undergone hysterectomy before study entry. TIA = Transient ischemic attack. Note: Cardiovascular events (including cerebrovascular and thromboembolic events), skeletal and urogenital/endometrial events and second primary malignancies were collected life -long. All of these events were assumed to be of CTC Grade 3 to 5 and were not individually graded. When considering all grades during study treatment, a higher incidence of events was seen for Femara regarding fractures (10.1% vs 7.1%), myocardial infarctions (1.0% vs 0.5%), and arthralgia (25.2% vs 20.4%) (Femara vs tamoxifen respectively).
Drug interactions
Tamoxifen Coadministration of Femara and tamoxifen 20 mg daily resulted in a reduction of letrozole plasma levels of 38% on average (Study P015). Clinical experience in the second-line breast cancer trials (AR/BC2 and AR/BC3) indicates that the therapeutic effect of Femara therapy is not impaired if Femara is administered immediately after tamoxifen. Cimetidine A pharmacokinetic interaction study with cimetidine (Study P004) showed no clinically significant effect on letrozole pharmacokinetics. Warfarin An interaction study (P017) with warfarin showed no clinically significant effect of letrozole on warfarin pharmacokinetics. Other Anticancer Agents There is no clinical experience to date on the use of Femara in combination with other anticancer agents.
Use in specific populations
Lactation: Advise not to breastfeed. ( 8.2 ) 8.1 Pregnancy Risk Summary Based on postmarketing reports, findings from animal studies and the mechanism of action, Femara can cause fetal harm and is contraindicated for use in pregnant women. In post-marketing reports, use of letrozole during pregnancy resulted in cases of spontaneous abortions and congenital birth defects; however, the data are insufficient to inform a drug-associated risk [see Contraindications (4), Warnings and Precautions (5.6), Adverse Reactions (6.2), and Clinical Pharmacology (12.1)] . In animal reproduction studies, administration of letrozole to pregnant animals during organogenesis resulted in increased post-implantation pregnancy loss and resorption, fewer live fetuses, and fetal malformation affecting the renal and skeletal systems in rats and rabbits at doses approximately 0.1 times the daily maximum recommended human dose (MRHD) on a mg/m 2 basis (see Data) . The background risk of major birth defects and miscarriage for the indicated population is unknown. However, the background risk in the U.S. general population of major birth defects is 2% to 4% and of miscarriage is 15% to 20% of clinically recognized pregnancies. Data Animal Data In a fertility and early embryonic development toxicity study in female rats, oral administration of letrozole starting 2 weeks before mating until pregnancy day 6 resulted in an increase in pre-implantation loss at doses ≥ 0.003 mg/kg/day (approximately 0.01 times the maximum recommended human dose on a mg/m 2 basis). In an embryo-fetal developmental toxicity study in rats, daily administration of oral letrozole during the period of organogenesis at doses ≥ 0.003 mg/kg (approximately 0.01 time the maximum recommended human dose on a mg/m 2 basis) resulted in embryo-fetal toxicity including intrauterine mortality, increased resorptions and postimplantation loss, decreased numbers of live fetuses and fetal anomalies, including absence and shortening of renal papilla, dilation of ureter, edema, and incomplete ossification of frontal skull and metatarsals. Letrozole was teratogenic to rats at a dose of 0.03 mg/kg (approximately 0.01 times the maximum recommended human dose on a mg/m 2 basis) and caused fetal domed head and cervical/centrum vertebral fusion. In the embryo-fetal development toxicity study in rabbits, daily administration of oral letrozole during the period of organogenesis at doses ≥ 0.002 mg/kg (approximately 0.01 times the maximum recommended human dose on a mg/m 2 basis) resulted in embryo-fetal toxicity, including intrauterine mortality, increased resorption, increased postimplantation loss and decreased numbers of live fetuses. Fetal anomalies included incomplete ossification of the skull, sternebrae, and fore- and hind legs. 8.2 Lactation Risk Summary It is not known if letrozole is present in human milk. There are no data on the effects of letrozole on the breastfed infant or milk production. Exposure of lactating rats to letrozole was associated with impaired reproductive performance of the male offspring (see Data) . Because of the potential for serious adverse reactions in breastfed infants from Femara, advise lactating women not to breastfeed while taking Femara and for at least 3 weeks after the last dose. Data Animal Data In a postnatal developmental toxicity study in lactating rats, letrozole was administered orally at doses of 1, 0.003, 0.03, or 0.3 mg/kg/day on Day 0 through Day 20 of lactation. The reproductive performance of the male offspring was impaired at letrozole dose as low as 0.003 mg/kg/day (approximately 0.01 times the maximum recommended human dose on a mg/m 2 basis), as reflected by decreased mating and pregnancy ratios. There were no effects on the reproductive performance of female offspring. 8.3 Females and Males of Reproductive Potential Pregnancy Testing Based on animal studies, Femara can cause fetal harm when administered to a pregnant woman [see Use in Specific Populations (8.1)] . Females of reproductive potential should have a pregnancy test prior to starting treatment with Femara. Contraception Females Based on animal studies, Femara can cause fetal harm when administered to a pregnant woman [see Use in Specific Populations (8.1)] . Advise females of reproductive potential to use effective contraception during treatment with Femara and for at least 3 weeks after the last dose. Infertility Females Based on studies in female animals, Femara may impair fertility in females of reproductive potential [see Nonclinical Toxicology (13.1)] . Males Based on studies in male animals, Femara may impair fertility in males of reproductive potential [see Nonclinical Toxicology (13.1)] . 8.4 Pediatric Use The safety and effectiveness in pediatric patients have not been established. Letrozole administration to young (postnatal day 7) rats for 12 weeks duration at 0.003, 0.03, 0.3 mg/kg/day by oral gavage resulted in adverse skeletal/growth effects (bone maturation, bone mineral density) and neuroendocrine and reproductive developmental perturbations of the hypothalamic-pituitary axis. Administration of 0.3 mg/kg/day resulted in AUC values that were similar to the AUC in adult patients receiving the recommended dose of 2.5 mg/day. Decreased fertility was accompanied by hypertrophy of the hypophysis and testicular changes that included degeneration of the seminiferous tubular epithelium and atrophy of the female reproductive tract. Young rats in this study were allowed to recover following discontinuation of letrozole treatment for 42 days. Histopathological changes were not reversible at clinically relevant exposures. 8.5 Geriatric Use The median age of patients in all studies of first-line and second-line treatment of metastatic breast cancer was 64-65 years. About 1/3 of the patients were greater than or equal to 70 years old.
Pregnancy
8.1 Pregnancy Risk Summary Based on postmarketing reports, findings from animal studies and the mechanism of action, Femara can cause fetal harm and is contraindicated for use in pregnant women. In post-marketing reports, use of letrozole during pregnancy resulted in cases of spontaneous abortions and congenital birth defects; however, the data are insufficient to inform a drug-associated risk [see Contraindications (4), Warnings and Precautions (5.6), Adverse Reactions (6.2), and Clinical Pharmacology (12.1)] . In animal reproduction studies, administration of letrozole to pregnant animals during organogenesis resulted in increased post-implantation pregnancy loss and resorption, fewer live fetuses, and fetal malformation affecting the renal and skeletal systems in rats and rabbits at doses approximately 0.1 times the daily maximum recommended human dose (MRHD) on a mg/m 2 basis (see Data) . The background risk of major birth defects and miscarriage for the indicated population is unknown. However, the background risk in the U.S. general population of major birth defects is 2% to 4% and of miscarriage is 15% to 20% of clinically recognized pregnancies. Data Animal Data In a fertility and early embryonic development toxicity study in female rats, oral administration of letrozole starting 2 weeks before mating until pregnancy day 6 resulted in an increase in pre-implantation loss at doses ≥ 0.003 mg/kg/day (approximately 0.01 times the maximum recommended human dose on a mg/m 2 basis). In an embryo-fetal developmental toxicity study in rats, daily administration of oral letrozole during the period of organogenesis at doses ≥ 0.003 mg/kg (approximately 0.01 time the maximum recommended human dose on a mg/m 2 basis) resulted in embryo-fetal toxicity including intrauterine mortality, increased resorptions and postimplantation loss, decreased numbers of live fetuses and fetal anomalies, including absence and shortening of renal papilla, dilation of ureter, edema, and incomplete ossification of frontal skull and metatarsals. Letrozole was teratogenic to rats at a dose of 0.03 mg/kg (approximately 0.01 times the maximum recommended human dose on a mg/m 2 basis) and caused fetal domed head and cervical/centrum vertebral fusion. In the embryo-fetal development toxicity study in rabbits, daily administration of oral letrozole during the period of organogenesis at doses ≥ 0.002 mg/kg (approximately 0.01 times the maximum recommended human dose on a mg/m 2 basis) resulted in embryo-fetal toxicity, including intrauterine mortality, increased resorption, increased postimplantation loss and decreased numbers of live fetuses. Fetal anomalies included incomplete ossification of the skull, sternebrae, and fore- and hind legs.
Pediatric use
8.4 Pediatric Use The safety and effectiveness in pediatric patients have not been established. Letrozole administration to young (postnatal day 7) rats for 12 weeks duration at 0.003, 0.03, 0.3 mg/kg/day by oral gavage resulted in adverse skeletal/growth effects (bone maturation, bone mineral density) and neuroendocrine and reproductive developmental perturbations of the hypothalamic-pituitary axis. Administration of 0.3 mg/kg/day resulted in AUC values that were similar to the AUC in adult patients receiving the recommended dose of 2.5 mg/day. Decreased fertility was accompanied by hypertrophy of the hypophysis and testicular changes that included degeneration of the seminiferous tubular epithelium and atrophy of the female reproductive tract. Young rats in this study were allowed to recover following discontinuation of letrozole treatment for 42 days. Histopathological changes were not reversible at clinically relevant exposures.
Geriatric use
8.5 Geriatric Use The median age of patients in all studies of first-line and second-line treatment of metastatic breast cancer was 64-65 years. About 1/3 of the patients were greater than or equal to 70 years old. In the first-line study, patients greater than or equal to 70 years of age experienced longer time to tumor progression and higher response rates than patients less than 70. For the extended adjuvant setting (MA-17), more than 5,100 postmenopausal women were enrolled in the clinical study. In total, 41% of patients were aged 65 years or older at enrollment, while 12% were 75 or older. In the extended adjuvant setting, no overall differences in safety or efficacy were observed between these older patients and younger patients, and other reported clinical experience has not identified differences in responses between the elderly and younger patients, but greater sensitivity of some older individuals cannot be ruled out. In the adjuvant setting (BIG 1-98), more than 8,000 postmenopausal women were enrolled in the clinical study. In total, 36% of patients were aged 65 years or older at enrollment, while 12% were 75 or older. More adverse reactions were generally reported in elderly patients irrespective of study treatment allocation. However, in comparison to tamoxifen, no overall differences with regards to the safety and efficacy profiles were observed between elderly patients and younger patients.
Overdosage
Isolated cases of Femara overdose have been reported. In these instances, the highest single dose ingested was 62.5 mg or 25 tablets. While no serious adverse reactions were reported in these cases, because of the limited data available, no firm recommendations for treatment can be made. However, emesis could be induced if the patient is alert. In general, supportive care and frequent monitoring of vital signs are also appropriate. In single-dose studies, the highest dose used was 30 mg, which was well tolerated; in multiple-dose trials, the largest dose of 10 mg was well tolerated. Lethality was observed in mice and rats following single oral doses that were equal to or greater than 2,000 mg/kg (about 4,000 to 8,000 times the daily maximum recommended human dose on a mg/m 2 basis); death was associated with reduced motor activity, ataxia and dyspnea. Lethality was observed in cats following single IV doses that were equal to or greater than 10 mg/kg (about 50 times the daily maximum recommended human dose on a mg/m 2 basis); death was preceded by depressed blood pressure and arrhythmias.
Description
Femara tablets for oral administration contains 2.5 mg of letrozole, a nonsteroidal aromatase inhibitor (inhibitor of estrogen synthesis). It is chemically described as 4,4'-(1H-1,2,4-Triazol-1-ylmethylene) dibenzonitrile, and its structural formula is Letrozole is a white to yellowish crystalline powder, practically odorless, freely soluble in dichloromethane, slightly soluble in ethanol, and practically insoluble in water. It has a molecular weight of 285.31 g/mol, empirical formula C 17 H 11 N 5 , and a melting range of 184°C to 185°C. Femara is available as 2.5 mg tablets for oral administration. Inactive Ingredients : Colloidal silicon dioxide, ferric oxide, hydroxypropyl methylcellulose, lactose monohydrate, magnesium stearate, maize starch, microcrystalline cellulose, polyethylene glycol, sodium starch glycolate, talc, and titanium dioxide. Femara drawing
Mechanism of action
12.1 Mechanism of Action The growth of some cancers of the breast is stimulated or maintained by estrogens. Treatment of breast cancer thought to be hormonally responsive (i.e., estrogen and/or progesterone receptor positive or receptor unknown) has included a variety of efforts to decrease estrogen levels (ovariectomy, adrenalectomy, hypophysectomy) or inhibit estrogen effects (antiestrogens and progestational agents). These interventions lead to decreased tumor mass or delayed progression of tumor growth in some women. In postmenopausal women, estrogens are mainly derived from the action of the aromatase enzyme, which converts adrenal androgens (primarily androstenedione and testosterone) to estrone and estradiol. The suppression of estrogen biosynthesis in peripheral tissues and in the cancer tissue itself can therefore be achieved by specifically inhibiting the aromatase enzyme. Letrozole is a nonsteroidal competitive inhibitor of the aromatase enzyme system; it inhibits the conversion of androgens to estrogens. In adult nontumor- and tumor-bearing female animals, letrozole is as effective as ovariectomy in reducing uterine weight, elevating serum LH, and causing the regression of estrogen-dependent tumors. In contrast to ovariectomy, treatment with letrozole does not lead to an increase in serum FSH. Letrozole selectively inhibits gonadal steroidogenesis but has no significant effect on adrenal mineralocorticoid or glucocorticoid synthesis. Letrozole inhibits the aromatase enzyme by competitively binding to the heme of the cytochrome P450 subunit of the enzyme, resulting in a reduction of estrogen biosynthesis in all tissues. Treatment of women with letrozole significantly lowers serum estrone, estradiol and estrone sulfate and has not been shown to significantly affect adrenal corticosteroid synthesis, aldosterone synthesis, or synthesis of thyroid hormones.
How supplied
Packaged in HDPE bottles with a safety screw cap. 2.5 mg tablets Bottles of 30 tablets NDC 0078-0249-15 Store at 20°C to 25°C (68°F to 77°F); excursions are permitted between 15°C and 30°C (59°F and 86°F) [see USP Controlled Room Temperature].
Patient information
Embryo-Fetal Toxicity Advise females of reproductive potential of the potential risk to a fetus and to use effective contraception during Femara therapy and for at least 3 weeks after the last dose. Advise females to contact their healthcare provider if they become pregnant, or if pregnancy is suspected, during treatment with Femara [s ee Warnings and Precautions (5.6 ) and Use in Specific Populations (8.1, 8.3)]. Lactation Advise women not to breastfeed during Femara treatment and for at least 3 weeks after the last dose [see Use in Specific Populations (8.2)]. Infertility Advise females and males of reproductive potential of the potential for reduced fertility from Femara [see Use in Specific Populations (8.3)]. Fatigue and Dizziness Since fatigue and dizziness have been observed with the use of Femara and somnolence was uncommonly reported, caution is advised when driving or using machinery [see Warnings and Precautions (5.4)] . Bone Effects Consideration should be given to monitoring bone mineral density [see Warnings and Precautions (5.1)] . Distributed by: Novartis Pharmaceuticals Corporation East Hanover, New Jersey, 07936 © Novartis T2024-86
Label text from the FDA structured product label by Novartis Pharmaceuticals Corporation (revised Jun 11, 2026). Long sections are shortened; the complete label is on DailyMed.
Active ingredients
- Letrozole in 1 product
Femara NDC products (1)
| NDC | Strength & form | Labeler | Type |
|---|---|---|---|
| 0078-0249 | Letrozole 2.5 mg/1 Tablet, Film Coated | Novartis Pharmaceuticals Corporation | NDA |
Frequently asked questions
What is Femara used for?
Femara is an aromatase inhibitor indicated for: Adjuvant treatment of postmenopausal women with hormone receptor positive early breast cancer. ( 1.1 ) Extended adjuvant treatment of postmenopausal women with early breast cancer who have received prior standard adjuvant tamoxifen therapy. ( 1.2 ) First and second-line treatment of postmenopausal women with hormone receptor positive or unknown…
What are the side effects of Femara?
The following adverse reactions are discussed in greater detail in other sections of the labeling. Bone effects [see Warnings and Precautions (5.1)] Increases in cholesterol [see Warnings and Precautions (5.2)] Fatigue and Dizziness [see Warnings and Precautions (5.4)] The most common adverse reactions (greater than 20%) were hot flashes, arthralgia; flushing, asthenia, edema, arthralgia,… See the full label for the complete list.
Who makes Femara?
Femara is listed by 1 labeler in the FDA NDC directory, including Novartis Pharmaceuticals Corporation.