Efficacy
OBG Management: What is Twirla’s efficacy in preventing pregnancy, and how does this compare to previous patches and other types of hormonal birth control?
Dr. Levy: You have to look at the pivotal trials and look at what the efficacy was in a trial setting. In the real-world setting, the effectiveness is never quite as good as it is in a clinical trial. I think the bottom line for all of us is that combined oral contraception, meaning estrogen with progestin, is equivalently effective across the different options that are available for women. Efficacy really isn’t the factor to use to distinguish which one I’m going to pick. It is about the patient’s convenience and many other factors. But in terms of its clinical effectiveness in preventing pregnancy, from a very practical standpoint, I think we consider them all the same.
Considering route of administration
OBG Management: Are there benefits associated with transdermal birth control vs other contraceptive options, and are women interested in transdermal contraception?
Dr. Levy: I think there’s always a benefit in having lots of choices. And for some women, being able to put a patch on once a week is much more convenient, easier to remember, and delivers a very consistent dose of hormone absorbed through the skin, which is different than taking a pill in the morning when your levels go up quickly then diminish over the day. The hormones are higher at a certain time, and then they drop off, so there might be some advantages for people who are very sensitive to swings in hormonal levels. There’s also a convenience factor, where for some people they will choose that. Other people might really dislike having a relatively large patch on their skin somewhere, or they may have skin sensitivity to the adhesive. Overall, I always think that having more options is better and individual girls/women will choose what works best for them.
Counseling tips
OBG Management: What are the instructions for patients to effectively use Twirla, and how should they be counseled regarding the expectations for their menstrual cycle?
Dr. Levy: Like other patches that are available on the market, these are a once-a-week patch. The patch should be placed on clean, dry skin. No lotions, perfumes, or anything on the skin because you really want them to stick for the whole week, and it’s not going to stick if there’s anything oily on the skin. The first patch is placed on day 1 of a menstrual cycle, the first day of bleeding, and then changed weekly for 3 weeks. Then there’s a 7-day patch-free time in which one would expect to have a period.
In general, breakthrough bleeding was not a significant problem with the patch, but some women will have some irregular spotting and bleeding with any sort of hormonal treatment; some women may have no periods at all. In other words, the estrogen dose and progestin may be of a balance that allows the patient not to have periods. But, in general, most of the women in the trial had regular light menstrual flow during the week when their patch was not on.5
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