1, changing before contraceptive method, must have sufficient knowledge to new method, master accurate use method.
2, take which kind of prophylactic no matter, should convert other contraceptive method, must insist to take cycle of a menstruation, anything but but midway changes, can create period otherwise disorder or contraceptive failure.
3, the woman that uses lasting effect prophylactic, if want to convert other contraceptive method, if place intrauterine device, use condom, should change first take short effect prophylactic 2 ～ 3 cycle, in order to reduce the happening with disorder menstruation.
4, although intrauterine device product is ceaseless newer, but have its actor drawback. The intrauterine device that already should place only suits him really, the effect does not have side-effect reliably, should continue to be used, change not blindly. Normally the intrauterine device can place 10 ～ 20 years.
5, the husband and wife that uses contraceptive tool formerly, if want to convert prophylactic of profess to convinced, answer to begin to take drug in menstruation, before taking drug, must insist to use contraceptive tool.
