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    1. barbara hastings-asatourian 86 months ago | reply

      A synthetic progesterone (progestogen) called Levonorgestrel is given in a larger dose than regular oral contraception for emergency contraception (EC) as one dose after unprotected sex (UPSI) or condom failure. Depending on the time of the month it might prevent ovulation, or implantation. It is licenced in the UK for use up to 72 hours (3 days, not just the Morning After) after unprotected sex, but can still be effective afterwards, however its effectiveness diminishes the longer the gap between UPSI and EC.

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