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is used as emergency contraceptive. It contain higher doses of the same hormones found in regular combined oral contraceptive pills
They are for use for up to 107 to 120 hours after unprotected sexual intercourse or contraceptive failure.
It has effectiveness of about 70 to 80%.
After taking these pills you will have your periods on the expected date. If you miss your period, i advice you after 7 days of missed period do a urine pregnancy
test to rule out pregnancy.
I hope that i have provided the information you needed.