IUD is an intrauterine device which is a safe and effective method of reversible contraception. IUDs are small flexible devices made of metal and/or plastic; they may be inert, or may release copper or hormone. Any IUD prevents pregnancy by a combination of mechanisms of action, including: - Inhibition of sperm migration in the upper female genital tract; - Inhibition of ovum transport; - Inhibition of fertilization; - The levonorgestrel-releasing IUD, in addition to the above, causes changes in the amount and viscosity of the cervical mucus, inhibiting sperm penetration.
Read more about advantages and disadvantages of IUDs.
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