{"id":"hormonal-contraception","safety":{"commonSideEffects":[{"rate":"10-30","effect":"Nausea"},{"rate":"5-20","effect":"Headache"},{"rate":"5-15","effect":"Breast tenderness"},{"rate":"5-20","effect":"Breakthrough bleeding"},{"rate":"5-10","effect":"Mood changes"},{"rate":"0.3-0.4","effect":"Venous thromboembolism"},{"rate":"2-5","effect":"Hypertension"}]},"_chembl":null,"_dailymed":null,"mechanism":{"_ai_source":"claude-haiku-4.5","explanation":"Hormonal contraceptives typically contain estrogen and/or progestin that work together to inhibit the hypothalamic-pituitary-gonadal axis, preventing the LH surge necessary for ovulation. Additionally, these hormones thicken cervical mucus to impede sperm transport and alter the endometrium to reduce implantation likelihood. The specific formulation and hormone ratios determine the contraceptive efficacy and side effect profile.","oneSentence":"Hormonal contraception prevents pregnancy by suppressing ovulation through synthetic hormones that inhibit the luteinizing hormone (LH) surge.","_ai_confidence":"medium"},"_scrapedAt":"2026-03-28T00:45:16.509Z","_scrapedBy":"cloudflare-swarm","_wikipedia":null,"indications":{"approved":[{"name":"Pregnancy prevention / Contraception"}]},"trialDetails":[{"nctId":"NCT04451746","phase":"NA","title":"The Influence of Combined Oral Contraception on the DEvelopment and progRession of Chronic venoUs diSeases","status":"COMPLETED","sponsor":"Clinic of Phlebology and Laser Surgery, Chelyabinsk, Russia","startDate":"2020-06-24","conditions":"Chronic Venous Diseases","enrollment":116},{"nctId":"NCT07115849","phase":"NA","title":"Effect of Different Sex Hormone Profiles for the Response to Physical Training","status":"RECRUITING","sponsor":"University of 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