Adverse Effects of Progesterone-Only Contraception in Females with Endometriosis
Key Adverse Effects by Contraceptive Type
- Depot medroxyprogesterone acetate (DMPA) carries a significantly elevated risk of venous thromboembolism (VTE) with a relative risk of 2.67 (95% CI 1.29-5.53) compared to other progestin-only methods, particularly concerning in women with antiphospholipid antibodies, chronic coronary disease, or previous stroke 1
- DMPA causes bone mineral density loss of up to 7.5% over 2 years, and long-term use should be avoided in women at risk for osteoporosis 2
- The American College of Obstetricians and Gynecologists recommends avoiding DMPA in women with thrombotic risk factors, cardiovascular disease, or osteoporosis risk 1, 2
- Progestin-only pills with micronized progesterone have a neutral or beneficial effect on blood pressure with better cardiovascular safety profile 3
- Norethisterone acetate has a worse profile regarding blood pressure, renal function, and renin-angiotensin system activation 3
- The World Health Organization recommends that women with endometriosis should avoid combined hormonal contraceptives if they require oophorectomy due to increased risk of disease reactivation 4
Special Populations Requiring Caution
- Women with positive antiphospholipid antibodies, history of VTE or stroke, or cyanotic congenital heart disease are at high risk and should avoid DMPA 1, 2
- Women with severe thrombocytopenia, systemic lupus erythematosus with positive antiphospholipid antibodies, or moderate to severe cardiac impairment should use DMPA with caution 2
Clinical Algorithm for Selection
- The American College of Obstetricians and Gynecologists recommends LNG-IUS as the first-line choice for most women with endometriosis due to its superior safety profile and high efficacy 1
- Progestin-only pills with micronized progesterone are an alternative option for women declining IUD or requiring systemic therapy 3