An IUD (intrauterine device) can be effective immediately or take up to seven days to become effective depending on the type and timing of insertion. Hormonal IUDs typically take up to 7 days to become fully effective unless inserted within the first seven days of the menstrual period, in which case they are effective immediately. Copper IUDs provide immediate contraception protection right after insertion regardless of the timing in the menstrual cycle. Copper IUDs can also serve as emergency contraception if inserted up to five days after unprotected intercourse.
Therefore:
- Hormonal IUD inserted during the first 7 days of the period: effective immediately.
- Hormonal IUD inserted at other times: effective after 7 days, backup contraception recommended during this time.
- Copper IUD: effective immediately after insertion.
This immediate or seven-day timeframe ensures reliable contraception depending on the type and timing of IUD placement.
