Postinor 1, containing levonorgestrel, and Primeout N Tablet, containing norethisterone, are both synthetic progestin hormones, and no clinically significant harmful interaction is reported between them. Taking Postinor 1 after Primeout N Tablet may temporarily alter your menstrual cycle, leading to irregular bleeding, spotting, or a delayed period due to combined hormonal effects. Postinor 1 should be taken as soon as possible, within 72 hours of unprotected intercourse, for maximum effectiveness and should not be postponed. If your next period is delayed by more than 7 days, a pregnancy test is recommended. For personalised advice based on cycle timing, dosage, and the reason for norethisterone use, consultation with a gynaecologist is advisable.