Different pills for different problems
With so many pills on the market, it is important for clinicians to know how to choose a particular pill for a particular patient. The following discussion assumes that the patient in question desires a COC for contraception, then offers guidance on how to choose a pill with patient-specific noncontraceptive benefits (TABLE 2).
When HMB is a concern. Patients with heavy menstrual bleeding may experience fewer bleeding and/or spotting days with extended cyclic or continuous use of a COC rather than with traditional cyclic use.6 Examples of such COC options include:
- Introvale and Seasonique, both extended-cycle formulations
- Amethyst, which is formulated without placebo pills so that it can be used continuously
- any other COC prescribed with instructions for the patient to skip placebo pills.
An extrapolated benefit to extended-cycle or continuous COCs use for heavy menstrual bleeding is addressing anemia.
For premenstrual dysphoric disorder, the only randomized controlled trials showing improvement involve drospirenone-ethinyl estradiol pills (Yaz and Yasmin).7 There is also evidence that extended cyclic or continuous use of these formulations is more impactful for premenstrual dysphoric disorder than a traditional cycle.8
Keeping migraine avoidance and prevention in mind. Various studies have looked at the impact of different COC formulations on menstrual-related symptoms. There is evidence of greater improvement in headache, bloating, and dysmenorrhea with extended cyclic or continuous use compared with traditional cyclic use.6
In terms of headache, let us delve into menstrual migraine in particular. Menstrual migraines occur sometime between 2 days prior to 2 days after the first day of menses and are linked to a sharp drop in estrogen levels. COCs are contraindicated in women with menstrual migraines with aura because of the increased stroke risk. For women with menstrual migraines without aura, COCs can prevent migraines. Prevention depends on minimizing fluctuations in estrogen levels; any change in estrogen level greater than 10 µg of ethinyl estradiol may trigger an estrogen-related migraine. All currently available regimens of COCs that comprise 21 days of active pills and 7 days of placebo involve a drop of more than 10 µg. Options that involve a drop of 10 µg or less include any continuous formulation, the extended formulation LoSeasonique (levonorgestrel 0.1 mg and ethinyl estradiol 20 µg for 84 days, then ethinyl estradiol 10 µg for 7 days), and Lo Loestrin (ethinyl estradiol 10 µg and norethindrone 1 mg for 24 days, then ethinyl estradiol 10 µg for 2 days, then placebo for 2 days).9
What’s best for acne-prone patients? All COCs should improve acne by increasing levels of sex hormone binding globulin. However, some comparative studies have shown drospirenone-containing COCs to be the most effective for acne. This finding makes sense in light of studies demonstrating antiandrogenic effects of drospirenone.10
Managing PCOS symptoms. It seems logical, by extension, that drospirenone-containing COCs would be particularly beneficial for treating hirsutism associated with polycystic ovary syndrome (PCOS). Other low‒androgenic-potential progestins, such as a third-generation progestin (norgestimate or desogestrel), might similarly be hypothesized to be advantageous. However, there is currently insufficient evidence to recommend any one COC formulation over another for the indication of PCOS.11
Ovarian cysts: Can COCs be helpful? COCs are commonly prescribed by gynecologists for patients with functional ovarian cysts. It is important to note that COCs have not been found to hasten the resolution of existing cysts, so they should not be used for this purpose.12 Studies of early COCs, which had high doses of estrogen (on the order of 50 µg), showed lower rates of cysts among users. This effect seems to be attenuated with the lower-estrogen-dose pills that are currently available, but there still appears to be benefit. Therefore, for a patient prone to cysts who desires an oral contraceptive, a COC containing estrogen 35 µg is likely to be the most beneficial of COCs currently on the market.13,14
Lower-dosage COCs in perimenopause may be beneficial. COCs can ameliorate perimenopausal symptoms including abnormal uterine bleeding and vasomotor symptoms. Clinicians are often hesitant to prescribe COCs for perimenopausal women because of increased risk of VTE, stroke, myocardial infarction, and breast cancer with increasing age. However, age alone is not a contraindication to any contraceptive method. An extended cyclic or continuous regimen COC may be the best choice for a perimenopausal woman in order to avoid vasomotor symptoms that occur during hormone-free intervals. In addition, given the increasing risk of adverse effects like VTE with estrogen dose, a lower estrogen formulation is advisable.15
Patients with epilepsy who are taking antiepileptic drugs (AEDs) are a special population when it comes to COCs. Certain AEDs induce hepatic enzymes involved in the metabolism and protein binding of COCs, which can result in contraceptive failure. Strong inducers are carbamazepine, oxcarbazepine, perampanel, phenobarbital, phenytoin, and primidone. Weak inducers are clobazam, eslicarbazepine, felbamate, lamotrigine, rufinamide, and topiramate. Women taking any of the above AEDs are recommended to choose a different form of contraception than a COC. However, if they are limited to COCs for some reason, a preparation containing estrogen 50 µg is recommended. It is speculated that the efficacy and adverse effects of COCs with increased hormone doses, used in combination with enzyme-inducing AEDs, should be comparable to those with standard doses when not combined with AEDs; however, this speculation is unproven.16 There are few COCs on the market with estrogen doses of 50 µg, but a couple of examples are Kelnor and Ogestrel.
Additional factors have to be considered with concurrent COC use with the AED lamotrigine since COCs increase clearance of this agent. Therefore, patients taking lamotrigine who start COCs will need an increase in lamotrigine dose. To avoid fluctuations in lamotrigine serum levels, use of a continuous COC is recommended.17
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