Contraceptive Efficacy and Safety of Ethinyl Estradiol and Levonorgestrel Combinations

Contraceptive Efficacy

The American Academy of Pediatrics recommends that standard monophasic pills containing 30-35 μg ethinyl estradiol with levonorgestrel be used as first-line for adolescents, with comparable efficacy across different low-dose formulations (20-35 μg ethinyl estradiol) when used correctly 2
Low-dose options, such as 20 μg ethinyl estradiol combined with 90-100 μg levonorgestrel, provide effective contraception with potentially fewer estrogen-related side effects 2

The World Health Organization categorizes absolute contraindications for combined hormonal contraceptives, including history of venous thromboembolism or pulmonary embolism, ischemic heart disease, and history of cerebrovascular accident 4, 5
Combined hormonal contraceptives containing ≤20 μg ethinyl estradiol have lower stroke risk compared to preparations with higher estrogen content (OR 1.19 per 10 μg increase) 1

The Centers for Disease Control and Prevention recommends levonorgestrel 1.5 mg single dose or ulipristal acetate 30 mg as preferred options over the combined regimen for emergency contraception 6
Patients already on combined oral contraceptives can and should use emergency contraception if unprotected intercourse occurred during the first week of pill pack or when ≥2 consecutive pills were missed 2, 7

Extended use of combined oral contraceptives provides significant non-contraceptive benefits, including protection against endometrial and ovarian cancers, and no increased risk of breast cancer 2