If you had Mirena inserted within 7 days after the start of your period then it is supposed to be effective immediately. If you had it inserted at any other time of your cycle then you are protected contraceptively after 7 days, so you must you use other form of contraception for 7 days.
- Mirena Information for Consumers
- Mirena Information for Healthcare Professionals (includes dosage details)
- Side Effects of Mirena (detailed)
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