<s>[INST] I took Postinor2 less than 24 hours after sex and the other pill 13 hours after that. I know I need to eat it in 12 hours time but something happened and I took it one hour late. Does that affects the effectiveness of Postinor? Do I need to get another set of pills and take two right away to reduce the risk of getting pregnant? [/INST] . Hi thanks for your question. You have to take postinor 2. Postinor 2 can help to prevent you from getting pregnant, after unprotected sex, The first tablet has to be taken within 72 hours (3 days) of unprotected sex. The tablets are more effective if they are taken as soon as possible after unprotected sex. You need to take 2nd tablet 12 hours (but no more than 16hours) after first. So relax you have taken the medicine well within the prescribed limit. Hope I answered your question. </s>