Family Planning in the Context of Medical Complexity
Applying the US MEC
Complex medical conditions require systematic use of the US MEC categories: 1 (no restriction), 2 (benefits outweigh risks), 3 (risks usually outweigh benefits), and 4 (unacceptable risk). Estrogen-containing methods are the usual source of category 3–4 restrictions. CHC is category 4 with migraine with aura, current VTE or known thrombophilia, ischemic heart disease, stroke, complicated diabetes with vascular disease, hypertension ≥160/100 mm Hg, smoking ≥15 cigarettes/day at age ≥35, and active breast cancer. Progestin-only methods and IUDs are often safer alternatives, but they are not universally risk-free.
Specific conditions
In SLE with positive antiphospholipid antibodies, CHC is contraindicated; progestin-only methods are preferred. In epilepsy, enzyme-inducing antiseizure drugs reduce hormonal contraceptive efficacy, and CHC can lower lamotrigine levels; IUDs are ideal. HIV antiretrovirals-especially efavirenz and some protease inhibitors-interact with implants and hormonal methods; the copper IUD avoids drug interactions. After bariatric surgery, oral absorption is unreliable, so LARC or DMPA is preferred. Obesity reduces emergency contraceptive efficacy, making a copper IUD the best postcoital option.
Traps: assuming progestin-only methods are always safe (DMPA may worsen bone loss and is category 3 with ischemic heart disease), forgetting that IUDs are appropriate in immunosuppression, and missing drug interactions.
Worked example: a 36-year-old smoker with migraine with aura requests contraception. CHC is category 4; offer a levonorgestrel IUD or implant, discuss unscheduled bleeding, and document the rationale.