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A member asked:
How does iud work?
A doctor has provided 1 answer
Stops Fertilization: Both the Mirena (levonorgestrel) and paragard iuds keep sperm from fertilizing an egg. Paragard--a copper iud releases copper into the uterus; copper works as a spermicide. Mirena (levonorgestrel) thickens cervical mucous so sperm cannot enter; Mirena (levonorgestrel) may also block ovulation. Both iuds may create uterine inflammation which makes it harder for the egg to implant even if it did get fertilized.
Answered 12/27/2016
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