||Nearly equal. Both are among the most effective methods.
|Length of use
||Approved for 10 years.
||Approved for 5 years.
||Longer and heavier monthly bleeding, irregular bleeding, and more cramping or pain during monthly bleeding.
||More irregular bleeding and spotting in the first few months. After one year no monthly bleeding is more common. Causes less bleeding than copper-bearing IUDs over time.
||May contribute to iron-deficiency anemia if a woman already has low iron blood stores before insertion.
||May help prevent iron-deficiency anemia.
|Main reasons for discontinuation
||Increased bleeding and pain.
||No monthly bleeding and hormonal side effects.
||May help protect against endometrial cancer.
||Effective treatment for long and heavy monthly bleeding (alternative to hysterectomy). May also help treat painful monthly bleeding. Can be used as the progestin in hormone replacement therapy.
||Can be inserted up to 48 hours postpartum.
||Can be inserted after 4 weeks postpartum.
|Use as emergency contraception
||Can be used within 5 days after unprotected sex.
||Requires specific training but easier to insert than levonorgestrel IUD.
||Requires specific training and a unique, more difficult insertion technique. Women may experience faintness, pain, and nausea or vomiting at insertion more than with the copper-bearing IUD.