Adult: As a combination product containing gestodene and ethinylestradiol in varying concentrations and pack sizes depending on brand. Generally, for a 21-day pack: 1 tablet daily for 21 days starting on the 1st day of menstruation, followed by 7 pill-free days, during which withdrawal bleeding will usually occur. The 2nd pack should be started immediately on the day after the 7 pill-free days, regardless of whether the bleeding has stopped. For a 28-day pack, 1 tablet daily for 28 days, to be started on the 1st day of menstruation, withdrawal bleeding will usually occur during the period when the 7 non-hormonal tablets are taken. Start the next pack immediately on the day after the last pill of the previous pack.