How safe is an intrauterine device?

Very safe: In the right patient, very safe. The beauty of an iud is that if it causes discomfort or bleeding, it can be easily removed. Mirena (levonorgestrel) also offers the benefit of low dose Progesterone locally which can help control heavy menstrual bleeding. It's unsafe for women prone for STDs since the iud can help infections reach the pelvic cavity & cause infections or abscesses. Your doc will review your risks.