The Model List of Essential Medicines from the World Health Organization presents a list of minimum medicine needs for a basic health care system and essential medicines for priority diseases. The Model List covers contraceptive methods, including IUDs. The type of IUD mentioned in the Model List is the "copper-containing device." (See p. 24 of the full-text document.) The WHO Model Lists of Essential Medicines has been updated every two years since 1977.
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