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Copper-ions releasing IUDs are more efficient than non medicated methods. Why?

Copper-ions releasing IUDs are more efficient than non medicated methods. Why?

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The copper releasing IUDs are more efficient than non medicated IUDs by increasing  phagocytosis of the sperms and bringing about unsuitable  changes in the genital tract for the sperms. In addition, they suppress  sperm motility so that the fertilization will not take place.
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