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Intra-uterine contraceptive device
Uterine. It stands for Intra-Uterine Device - A contraceptive device to prevent pregnancy.
No. Mirena is a contraceptive Intrauterine device (IUD) and should have no effect on, nor be affected by taking valacyclovir (Valtrex).
Yes. There are few cases of pregnancy on this device. But then it is one of the best contraceptive. No method is totally safe.
Misoprostol is not a contraceptive.