These well-known generations showed a trend ( 1 ) to progressively decrease the EE content of COCs and potentially decreasing the thrombotic risk, and ( 2 ) to reduce androgenicity of progestogens for a better tolerability, the fourth generation even containing an anti-androgenic progestogen (DRSP).
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A detailed review of pharmacokinetics/pharmacodynamics of progestogens in oral contraception.
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