{"id":"dydrogesterone-oral-tablet","safety":{"commonSideEffects":[{"rate":null,"effect":"Headache"},{"rate":null,"effect":"Dizziness"},{"rate":null,"effect":"Nausea"},{"rate":null,"effect":"Breast tenderness"},{"rate":null,"effect":"Abdominal discomfort"}]},"_chembl":{"chemblId":"CHEMBL1200853","moleculeType":"Small molecule","molecularWeight":"312.45"},"_dailymed":null,"mechanism":{"_ai_source":"claude-haiku-4.5","explanation":"Dydrogesterone is a retro-isomer of norgestrel that selectively activates progesterone receptors with minimal androgenic activity. It is used to supplement or replace endogenous progesterone in conditions of progesterone deficiency, particularly during the luteal phase of the menstrual cycle and in early pregnancy support. 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