Is the contraceptive pill effective within 72 hours?

In general, whether contraceptive pills are effective within 72 hours depends primarily on the type of contraceptive used. If it is an emergency contraceptive pill, taking it within 72 hours after intercourse as directed by a healthcare provider is effective. However, if it is a long-acting or short-acting oral contraceptive, taking it within 72 hours after intercourse may not reliably prevent pregnancy. The details are as follows:

Emergency contraceptive pills, such as levonorgestrel tablets, are typically effective when taken within 72 hours after unprotected sex or contraceptive failure, with higher effectiveness the sooner they are taken. These medications primarily work by inhibiting ovulation and preventing implantation of a fertilized egg.

Long-acting and short-acting oral contraceptives differ from emergency contraceptives in terms of dosage regimen and timing. Long-acting contraceptives are usually taken once per month, while short-acting contraceptives must be taken daily. The contraceptive effect of these two types does not become effective simply by taking them within 72 hours of intercourse; rather, they require consistent, long-term use according to prescribed cycles and dosages to achieve reliable contraception.

After using emergency contraceptive pills, side effects such as changes in the menstrual cycle, nausea, and headaches may occur. These are generally normal, but if symptoms are severe or persist, medical attention should be sought immediately.