Stop Xulane if an arterial or deep venous thrombotic event (VTE) occurs.
Stop Xulane if there is unexplained loss of vision, proptosis, diplopia, papilledema, or retinal vascular lesions. Evaluate for retinal vein thrombosis immediately.
If feasible, stop Xulane at least 4 weeks before and through 2 weeks after major surgery or other surgeries known to have an elevated risk of VTE. Discontinue use of Xulane during prolonged immobilization and resume treatment based on clinical judgment.
Start Xulane no earlier than 4 weeks after delivery, in women who are not breastfeeding. The risk of postpartum VTE decreases after the third postpartum week, whereas the risk of ovulation increases after the third postpartum week.
The use of combination hormonal contraceptives (CHCs) increases the risk of VTE. Known risk factors for VTE include smoking, obesity and family history of VTE, in addition to other factors that contraindicate use of CHCs [see Contraindications (4)].
Five epidemiologic studies1- 9 that assessed the risk of VTE associated with use of norelgestromin and ethinyl estradiol transdermal system are described below. These are 4 case control studies, that compared VTE rates among women using norelgestromin and ethinyl estradiol transdermal system to rates among women using an OC comparator, and an FDA-funded cohort study that estimated and compared VTE rates among women using various hormonal contraceptives, including norelgestromin and ethinyl estradiol transdermal system. All five studies were retrospective studies from U.S. electronic healthcare databases and included women aged 15 to 44 (10 to 55 in the FDA-funded study) who used norelgestromin and ethinyl estradiol transdermal system or oral contraceptives containing 20 mcg to 35 mcg of ethinyl estradiol (EE) and levonorgestrel (LNG), norethindrone, or norgestimate (NGM). NGM is the prodrug for NGMN, the progestin in Xulane.
Some of the data from the epidemiologic studies suggest an increased risk of VTE with use of norelgestromin and ethinyl estradiol transdermal system compared to use of some combined oral contraceptives (see Table 1). The studies used slightly different designs and reported relative risk estimates ranging from 1.2 to 2.2. None of the studies have adjusted for body mass index, smoking, and family history of VTE, which are potential confounders. The interpretations of these relative risk estimates range from no increase in risk to an approximate doubling of risk. One of the studies found a statistically significant increased risk of VTE for current users of norelgestromin and ethinyl estradiol transdermal system.
The five studies are:
- The i3 Ingenix study with NGM-containing oral contraceptives as the comparator, including a 24-month extension, based on the Ingenix Research Datamart; this study included patient chart review to confirm the VTE occurrence.
- The Boston Collaborative Drug Surveillance Program (BCDSP) with NGM-containing oral contraceptives as the comparator (BCDSP NGM), including two extensions of 17 and 14 months, respectively, based on the Pharmetrics database, using only non-fatal idiopathic cases. VTE cases were not confirmed by chart review.
- BCDSP with LNG-containing oral contraceptives as the comparator, based on the Pharmetrics database, using only non-fatal idiopathic cases. VTE cases were not confirmed by chart review.
- BCDSP with LNG-containing oral contraceptives as the comparator, based on the Marketscan database, using only non-fatal idiopathic cases. VTE cases were not confirmed by chart review.
- FDA-funded study with two groups of comparators [1) LNG-containing oral contraceptives, and 2) oral contraceptives that contain LNG, norethindrone or norgestimate], based on Kaiser Permanente and Medicaid databases. This study used all cases of VTE (idiopathic and non-idiopathic) and included patient chart review to confirm the VTE occurrence.
The i3 Ingenix and BCDSP NGM studies have provided data on additional cases identified in study extensions; however, each study extension was not powered to provide independent estimates of risk. The pooled estimates provide the most reliable estimates of VTE risk. Risk ratios from the original and various extensions of the i3 Ingenix and BCDSP NGM studies are provided in Table 1. The results of these studies are presented in Figure 1.
Table 1: Estimates (Risk Ratios) of Venous Thromboembolism Risk in Current Users of Norelgestromin and Ethinyl Estradiol Transdermal System Compared to Combined Oral Contraceptive UsersEpidemiologic Study “New users” – i.e., women with no prior exposure to the drug studied during a pre-specified time period – are considered to be the most informative population to study in pharmacoepidemiologic safety studies. All estimates took account of new-user status. The method and time period used to identify “new users” varied from study to study. | Comparator Product | Risk Ratios (95% CI) |
i3 Ingenix NGM Study in Ingenix Research Datamart1,6,7,8 | NGM/35 mcg EE NGM = norgestimate; EE = ethinyl estradiol | 2.2 Increase in risk of VTE is statistically significant (1.2 – 4.0)Pooled risk ratio from references 1 and 6 covering the initial 33-month study plus 24-month extension. [Initial 33 months of data: Risk Ratio (95% CI) = 2.5C (1.1-5.5); Separate estimate from the 24 months of data on new cases not included in the previous estimate: Risk Ratio (95% CI) = 1.4 (0.5-3.7)]. These risk ratios are based on idiopathic cases (those in women without other known risk factors for VTE). If all VTE cases are considered, the pooled risk ratio and 95% CI are 2.0 (1.2-3.3)C. |
BCDSP BCDSP = Boston Collaborative Drug Surveillance Program; the risk ratios are based on idiopathic cases. NGM Study in Pharmetrics database2,3,5 | NGM/35 mcg EE | 1.2 (0.9 – 1.8) Pooled risk ratio from references 2, 3 and 5 covering the initial 36-month study, plus 17-month and 14-month extensions. [Initial 36 months of data: Risk Ratio (95% CI) = 0.9 (0.5-1.6); Separate estimate from 17 months of data on new cases not included in the previous estimate: Risk Ratio (95% CI) = 1.1 (0.6-2.1); Separate estimate from 14 months of data on new cases not included in the previous estimates: Risk Ratio (95% CI) = 2.4C (1.2-5.0)] |
BCDSP LNG Study in Pharmetrics database4 | LNG LNG = levonorgestrel /30 mcg EE | 2.0 (0.9 – 4.1) 48 months of data. |
BCDSP LNG Study in Marketscan database4 | LNG/30 mcg EE | 1.3 (0.8 – 2.1) 69 months of data. |
FDA-funded Study in Kaiser Permanente and Medicaid databases 84 months of data in FDA-funded study ,Results for “All users,” i.e., initiation and continuing use of study combination hormonal contraception: “All progestins”/20-35 mcg EE, Risk Ratio (95% CI) = 1.6 (1.2-2.1)C and LNG/30 mcg EE, Risk Ratio (95% CI) = 1.3 (1.0-1.8). ,9 | “All progestins Includes the following progestins: LNG, norethindrone, norgestimate. ”/20 - 35 mcg EELNG/30 mcg EE | 1.4 (0.9 – 2.0) 1.2 (0.8 – 1.9) |
Figure 1: VTE Risk of Norelgestromin and Ethinyl Estradiol Transdermal System Relative to Combined Oral Contraceptives
Figure 1: Vte Risk Of Norelgestromin And Ethinyl Estradiol Transdermal System Relative To Combined Oral Contraceptives (Image 01)
An increased risk of thromboembolic and thrombotic disease associated with the use of combination hormonal contraceptives (CHCs) is well established. Although the absolute VTE rates are increased for users of CHCs compared to non-users, the rates associated with pregnancy are even greater, especially during the postpartum period (see Figure 2).
The frequency of VTE in women using CHCs has been estimated to be 3 to 12 cases per 10,000 woman-years.
The risk of VTE is highest during the first year of use of CHCs and when restarting hormonal contraception after a break of 4 weeks or longer. The risk of thromboembolic disease due to CHCs gradually disappears after CHC use is discontinued.
Figure 2 shows the risk of developing a VTE for women who are not pregnant and do not use CHCs, for women who use CHCs, for pregnant women, and for women in the postpartum period.
To put the risk of developing a VTE into perspective: If 10,000 women who are not pregnant and do not use CHCs are followed for one year, between 1 and 5 of these women will develop a VTE.
Figure 2: Likelihood of Developing a VTE
Use of CHCs also increases the risk of arterial thromboses such as, cerebrovascular events (thrombotic and hemorrhagic strokes) and myocardial infarctions, especially in women with other risk factors for these events. In general, the risk is greatest among older (> 35 years of age), hypertensive women who also smoke. Use CHCs with caution in women with cardiovascular disease risk factors.