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  • Dosing Regimen
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  • Heavy Menstrual Bleeding
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Natazia®: A low-dose OC that delivers high

contraceptive efficacy3 

Natazia®: A low-dose OC that delivers high

contraceptive efficacy3 

For pregnancy prevention and the treatment of heavy menstrual bleeding (HMB) in women without organic pathology who choose to use an oral contraceptive (OC) as their method of contraception1

Highly effective in pregnancy prevention

To achieve maximum contraceptive effectiveness, Natazia must be taken exactly as directed.

Study 1 - pearl index of 1.64 in North America
Study 2 Pearl index of 1.04 in Europe

The Pearl Index (PI) was the primary efficacy endpoint used to assess contraceptive reliability and was assessed in each of the 2 studies, assuming all subjects were at risk of pregnancy in all medication cycles unless backup contraception was documented. The PI is based on pregnancies that occurred after the onset of treatment and within 7 days after the last pill intake. Cycles in which conception did not occur, but which included the use of backup contraception, were not included in the calculation of the PI. The PI also includes patients who did not take the drug correctly. The Kaplan-Meier method was also used to calculate the contraceptive failure rate. 

 

Study 1: A multicenter, open-label, single-arm, unintended pregnancy study conducted in the United States and Canada included 490 healthy subjects between 18 and 35 years of age (mean age: 25.1 years) who were treated for up to 28 cycles of 28 days each. The weight range for treated women was 40 kg to 100 kg (mean weight: 62.5 kg) and the body mass index (BMI) range was 14 kg/m2 to 30 kg/m2 (mean BMI: 23.3 kg/m2). Of treated women, 15% discontinued the study treatment due to an adverse event, 13% were lost to follow-up, 10% withdrew their consent, 8% discontinued due to other reasons, 1% discontinued due to protocol deviation, and 1% discontinued due to pregnancy.  

 

Study 2: A multicenter, open-label, single-arm, contraceptive reliability study conducted in Europe (Germany, Austria, and Spain). There were 1377 healthy subjects between 18 and 50 years of age (mean age: 30.3 years) who were treated for 20 cycles of 28 days each. The weight range for treated women was 38 kg to 98 kg (mean weight: 63.8 kg) and the BMI range was 15 kg/m2 to 31.8 kg/m2 (mean BMI: 22.8 kg/m2). Of treated women, 10% discontinued the study treatment due to an adverse event, 5% discontinued due to other reasons, 2% were lost to follow-up,  2% discontinued due to protocol deviation, 2% withdrew their consent, and 1% discontinued due to pregnancy. 

 

Common Adverse Reactions (≥2%) in contraception (n=1867) and HMB (n=264) studies:

Headache (including migraines) (12.7%), breast pain, discomfort, or tenderness (7.0%), menstrual disorders (metrorrhagia, menstruation irregular, menorrhagia, vaginal hemorrhage, dysfunctional uterine bleeding, genital hemorrhage, abnormal withdrawal bleeding, uterine hemorrhage) (6.9%), nausea or vomiting (6.0%), acne (3.9%), mood changes (depression, mood swings, depressed mood, mood altered, affect lability, dysthymic disorder, crying) (3.0%), and increased weight (2.9%).

Demonstrated a shorter, lighter scheduled withdrawal bleed versus a monophasic 21/7 OC containing 20 mcg of ethinyl estradiol (EE) and 100 mcg of levonorgestrel (LNG)7

 

 

Study Design: A multicenter, double-blind, double-dummy, randomized clinical trial conducted in 34 centers in Germany, the Czech Republic, and France between March 2005 and September 2006. 804 healthy women aged 18 to 50 years were randomized to receive 28 days of either Natazia or a monophasic OC containing 20 mcg of EE and 100 mcg of LNG for 7 cycles. The dosing on the monophasic regimen was administered on days 1 to 21 with a placebo on days 22 to 28. Participants were assessed at screening (visit 1), baseline (visit 2), weeks 15 to 16 (visit 3), and at final examination from weeks 29 to 30 or at discontinuation (visit 4). The primary efficacy outcomes were bleeding pattern (number of bleeding/spotting days, as well as the number and length of bleeding/spotting episodes) and cycle control (incidence and characteristics of scheduled and intracyclic bleeding). Bleeding was assessed daily using diary cards. Bleeding intensity was gauged on a 5-point scale, where 1=none, 2=spotting, 3=light, 4=normal, and 5=heavy.7

 

This study was descriptive in nature and was not designed to show equivalence or noninferiority. 95% confidence intervals were calculated for bleeding/spotting per reference period. Post hoc statistical analyses were conducted in order to test for treatment differences in bleeding pattern and cycle control outcomes.7

Natazia withdrawal bleed bar chart

When compared with a monophasic OC, Natazia treatment resulted in:

down arrow with period droplets

Lower maximum intensity of withdrawal bleeding 7 

Estradiol valerate/dienogest (E2V/DNG) median score 3 (light bleeding) versus EE/LNG median score 4 (normal bleeding)* 

stopwatch

Shorter mean duration of withdrawal bleeding over 7 cycles7

E2V/DNG median 4.0 days versus EE/LNG median 5.0 days (P<0.05 per cycle)

 

*A greater proportion of women who received Natazia experienced spotting or light bleeding, relative to those who received the comparator.7 

When compared with a monophasic OC, Natazia treatment resulted in:

down arrow with period droplets

Lower maximum intensity of withdrawal bleeding 7 

Estradiol valerate/dienogest (E2V/DNG) median score 3 (light bleeding) versus EE/LNG median score 4 (normal bleeding)* 

 

*A greater proportion of women who received Natazia experienced spotting or light bleeding, relative to those who received the comparator.7 

stopwatch

Shorter mean duration of withdrawal bleeding over 7 cycles7

E2V/DNG median 4.0 days versus EE/LNG median 5.0 days (P<0.05 per cycle)

Fewer women experienced a scheduled withdrawal bleed with Natazia when compared with a monophasic OC containing 20 mcg of EE and 100 mcg of LNG7

Absence of scheduled withdrawal bleeding table
Scheduled withdrawal bleeding icon

Smaller proportion of women who experienced scheduled withdrawal bleeding per cycle 7

E2V/DNG range from 77.7% to 83.2% versus EE/LNG 89.5% to 93.8% (P<0.0001 in each cycle over 7 cycles)

Absence of scheduled withdrawal bleeding icon

Greater proportion of women with an absence of scheduled withdrawal bleeding over 7 cycles 7 

Mean 19.4% over 7 cycles versus 7.7% for the comparator (P<0.0001 for all cycles)

Adverse events (AEs) considered possibly related to treatment occurred in 10% of women treated with E2V/DNG and 8.5% of women treated with EE/LNG. The most frequently reported AEs in women treated with E2V/DNG were breast pain (3.8%), headache (2.5%), and vaginal infection (2.5%), while those in women treated with EE/LNG were acne (3.3%), headache (3.3%), and nasopharyngitis (1.8%). The rate of discontinuation due to AEs was 3.3% in both treatment groups. No women discontinued due to bleeding disorders.7

Scheduled withdrawal bleeding

Smaller proportion of women who experienced scheduled withdrawal bleeding per cycle 7

E2V/DNG range from 77.7% to 83.2% versus EE/LNG 89.5% to 93.8% (P<0.0001 in each cycle over 7 cycles)

Absence of scheduled withdrawal bleeding

Greater proportion of women with an absence of scheduled withdrawal bleeding over 7 cycles 7 

Mean 19.4% over 7 cycles versus 7.7% for the comparator (P<0.0001 for all cycles)

Adverse events (AEs) considered possibly related to treatment occurred in 10% of women treated with E2V/DNG and 8.5% of women treated with EE/LNG. The most frequently reported AEs in women treated with E2V/DNG were breast pain (3.8%), headache (2.5%), and vaginal infection (2.5%), while those in women treated with EE/LNG were acne (3.3%), headache (3.3%), and nasopharyngitis (1.8%). The rate of discontinuation due to AEs was 3.3% in both treatment groups. No women discontinued due to bleeding disorders.7

Heavy menstrual bleeding icon

See Natazia Heavy Menstrual Bleeding Data >>

Important Safety Information

More Important Safety Information More Important Safety Information

Women over 35 years old who smoke should not use Natazia. Smoking increases the risk of serious cardiovascular side effects from Natazia use. This risk increases with age and the number of cigarettes smoked.

Patients who should not take Natazia

Natazia is contraindicated in females with a high risk of arterial or venous thrombotic diseases, undiagnosed abnormal uterine bleeding, current diagnosis of, or history of, breast cancer which may be hormone sensitive, liver tumors (benign or malignant) or liver disease, or who are pregnant.

 

Know the most serious risks

Thromboembolic and Other Vascular Events: Stop Natazia if an arterial or venous thrombotic event occurs. The risk of venous thromboembolism (VTE) is highest during the first year of combination oral contraceptive (COC) use. This increased risk is greatest after initially starting a COC or restarting the same or a different COC following a 4 week or greater pill-free interval.

 

COC use also increases the risk of arterial thromboses (eg, stroke and myocardial infarction) especially in women with other risk factors for these events. If feasible, stop Natazia at least 4 weeks before and through 2 weeks after major surgery or other surgeries known to have an elevated risk of thromboembolism. Start Natazia no earlier than 4 weeks after delivery, in women who are not breastfeeding. COCs must be used with caution in women with cardiovascular disease risk factors.

 

Liver Disease: Discontinue Natazia if jaundice develops. Hepatic adenomas are associated with COC use.

 

High Blood Pressure (BP): For women with well-controlled hypertension, monitor blood pressure and stop Natazia if blood pressure rises significantly. Women with uncontrolled hypertension or hypertension with vascular disease should not use COCs. An increase in blood pressure has been reported in women taking COCs, and this increase is more likely in older women and with extended duration of use.

 

Carbohydrate and Lipid Metabolic Effects: Carefully monitor prediabetic and diabetic COC users. Consider alternative contraception for women with uncontrolled dyslipidemia.

 

Headache: If a Natazia user develops new headaches that are recurrent, persistent, or severe, evaluate the cause and discontinue Natazia if indicated. Increased frequency or severity of migraines may be reason for immediate discontinuation.

 

Bleeding Irregularities: If irregular bleeding persists or occurs after previously regular cycles, check for causes such as pregnancy or malignancy. Rule out pregnancy in the event of amenorrhea occurring in 2 or more consecutive cycles.

 

Drug Interactions: Women taking strong CYP3A4 inducers (eg, carbamazepine, phenytoin, rifampicin, and St. John’s wort) should not use Natazia during and for at least 28 days after discontinuation of these inducers due to the possibility of decreased contraceptive efficacy. 

 

Counsel patients that Natazia does not protect against HIV infection and other sexually transmitted diseases.

 

Serious adverse reactions in clinical trials

Myocardial infarction, ruptured ovarian cyst, deep vein thrombosis, focal nodular hyperplasia of the liver, uterine leiomyoma, acute cholecystitis, and chronic acalculous cholecystitis.

 

Most common adverse reactions (≥2%) in clinical trials

Headache (including migraines) (12.7%), breast pain, discomfort or tenderness (7.0%), menstrual disorders (6.9%), nausea or vomiting (6.0%), acne (3.9%), mood changes (3.0%), and increased weight (2.9%).

 

 

INDICATIONS

Natazia is indicated for use by women to prevent pregnancy.

 

Natazia is also indicated for the treatment of heavy menstrual bleeding in women without organic pathology who choose to use an oral contraceptive as their method of birth control.

 

The contraceptive efficacy of Natazia in women with a body mass index (BMI) of >30 kg/m2 has not been evaluated.

 

Please see full Prescribing Information about Natazia, including Boxed Warning. 

 

You are encouraged to report side effects or quality complaints of products to the FDA by visiting www.fda.gov/medwatch or calling 1-800-FDA-1088.

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You are encouraged to report side effects or quality complaints of products to the FDA by visiting www.fda.gov/medwatch or calling 1-800-FDA-1088. 

 

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Site Last Modified 5/2022

 

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