At issue: Break-through bleeding, mood, and weight gain
For women bothered by intermenstrual bleeding, use of a COC with a third-generation progestin may be preferable to use of one with a first- or second-generation. It may be because of decreased abnormal bleeding that COCs with third-generation progestins have lower discontinuation rates.22 In addition, COCs containing estrogen 20 µg or less are associated with more intermenstrual bleeding than those with more than 20 µg estrogen.23 Keep in mind that it is common with any COC to have intermenstrual bleeding for the first several months.
For women with pre-existing mood disorders or who report mood changes with COCs, it appears that fluctuations in hormone levels are problematic. Consistently, there is evidence that monophasic pills are preferable to multiphasic and that extended cyclic or continuous use is preferable to traditional cyclic use for mitigating mood adverse effects. There is mixed evidence on whether a low dose of ethinyl estradiol is better for mood.3
Although it is discussed above that randomized controlled trials have not shown an association between COC use and weight gain, many women remain concerned. For these women, a drospirenone-containing COC may be the best choice. Drospirenone has antimineralocorticoid activity, so it may help prevent water retention.
A brief word about multiphasic COCs. While these pills were designed to mimic physiologic hormone fluctuations and minimize hormonal adverse effects, there is insufficient evidence to compare their effects to those of monophasic pills.24 Without such evidence, there is little reason to recommend a multiphasic pill to a patient over the more straightforward monophasic formulation.
Conclusion
There are more nuances to prescribing an optimal COC for a patient than may initially come to mind. It is useful to remember that any formulation of pill may be prescribed in an extended or continuous fashion, and there are benefits for such use for premenstrual dysphoric disorder, heavy menstrual bleeding, perimenopause, and menstrual symptoms. Although there are numerous brands of COCs available, a small cadre will suffice for almost all purposes. Such a “toolbox” of pills could include a pill formatted for continuous use (Seasonique), a low estrogen pill (Loestrin), a drospirenone-containing pill (Yaz), and a pill containing a third-generation progestin and a higher dose of estrogen (Sprintec). ●