IUDs (intrauterine devices) are highly effective forms of reversible contraception, with a typical effectiveness rate of over 99%. This means fewer than 1 out of 100 people using an IUD will get pregnant each year

. Key points about IUD effectiveness:

• Both copper and hormonal IUDs are more than 99% effective at preventing pregnancy

• Effectiveness begins immediately for copper IUDs and typically within one week for hormonal IUDs, depending on timing of insertion

• IUDs are considered "set-it-and-forget-it" contraception, requiring no daily action, which reduces user error and contributes to their high effectiveness

• IUDs are also the most effective form of emergency contraception if inserted within 5 days after unprotected sex, with effectiveness exceeding 99.9% in that context

• Their long duration of use ranges from 3 to 12 years depending on the type and brand

Additional benefits related to effectiveness:

• IUDs work as well as sterilization and contraceptive implants but are reversible

• Fertility returns quickly after removal, with no long-term impact on the ability to conceive

• Hormonal IUDs can reduce menstrual cramps and bleeding, improving overall user experience

In summary, IUDs are among the most effective contraceptive methods available, with a failure rate of less than 1% per year, making them a reliable and convenient choice for long-term pregnancy prevention.