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No. Not mirena but other birth controls with estrogen yes. St. John's Wart will process the estrogen from the Birth Control faster causing a menopausal reaction that may cause pregnancy. The mirena is esteogen free and uses only the hormones progestin and levonorgestrel. There is no evidence so far that St. John's wart has a negative effect on the mirena. Mirena also creates an atmosphere within your uterus to avoid pregnancy. You should read more on their website concerning how it works.

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13y ago

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