In the era of long-acting reversible contraceptives (LARCs), the pill can seem obsolete. However, it is still the second most commonly used birth control method in the United States, chosen by 19% of female contraceptive users as of 2015–2017.1 It also has noncontraceptive benefits, so it is important that obstetrician-gynecologists are well-versed in its uses. In this article, I will focus on combined oral contraceptives (COCs; TABLE 1), reviewing the major risks, benefits, and adverse effects of COCs before focusing on recommendations for particular formulations of COCs for various patient populations.
Benefits and risks
There are numerous noncontraceptive benefits of COCs, including menstrual cycle regulation; reduced risk of ovarian, endometrial, and colorectal cancer; and treatment of menorrhagia, dysmenorrhea, acne, menstrual migraine, premenstrual syndrome and premenstrual dysphoric disorder, pelvic pain due to endometriosis, and hirsutism.
Common patient concerns
In terms of adverse effects, there are more potential unwanted effects of concern to women than there are ones validated in the literature. Accepted adverse effects include nausea, breast tenderness, and decreased libido. However, one of the most common concerns voiced during contraceptive counseling is that COCs will cause weight gain. A 2014 Cochrane review identified 49 trials studying the weight gain question.2 Of those, only 4 had a placebo or nonintervention group. Of these 4, there was no significant difference in weight change between the COC-receiving group and the control group. When patients bring up their concerns, it may help to remind them that women tend to gain weight over time whether or not they are taking a COC.
Another common concern is that COCs cause mood changes. A 2016 review by Schaffir and colleagues sheds some light on this topic,3 albeit limited by the paucity of prospective studies. This review identified only 1 randomized controlled trial comparing depression incidence among women initiating a COC versus a placebo. There was no difference in the incidence of depression among the groups at 3 months. Among 4 large retrospective studies of women using COCs, the agents either had no or a beneficial effect on mood. Schaffir’s review reports that there may be greater mood adverse effects with COCs among women with underlying mood disorders.
Patients may worry that COC use will permanently impair their fertility or delay return to fertility after discontinuation. Research does indicate that return of fertility after stopping COCs often takes several months (compared with immediate fertility after discontinuing a barrier method). However, there still seem to be comparable conception rates within 12 months after discontinuing COCs as there are after discontinuing other common nonhormonal or hormonal contraceptive methods. Fertility is not impacted by the duration of COC use. In addition, return to fertility seems to be comparable after discontinuation of extended cycle or continuous COCs compared with traditional-cycle COCs.4
COC safety
Known major risks of COCs include venous thromboembolism (VTE). The risk of VTE is about double among COC users than among nonpregnant nonusers: 3–9 per 10,000 woman-years compared with 1–5.5 In a study by the US Food and Drug Administration, drospirenone-containing COCs had double the risk of VTE than other COCs. However, the position of the American College of Obstetricians and Gynecologists on this increased risk of VTE with drospirenone-containing pills is that it is “possible” and “minimal.”5 It is important to remember that an alternative to COC use is pregnancy, in which the VTE risk is about double that among COC users, at 5–20 per 10,000 woman-years. This risk increases further in the postpartum period, to 40–65 per 10,000 woman-years.5
Another known major risk of COCs is arterial embolic disease, including cerebrovascular accidents and myocardial infarctions. Women at increased risk for these complications include those with hypertension, diabetes, and/or obesity and women who are aged 35 or older and smoke. Interestingly, women with migraines with aura are at increased risk for stroke but not for myocardial infarction. These women increase their risk of stroke 2- to 4-fold if they use COCs.
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