Mirena releases ____ of LNG per day.: (A) 20 mg, (B) 20 microgram, (C) 52 mg, (D) 52 microgram
Answer is B. Mirena contains a total of 52 mg levonorgestrel (LNG). LNG is released into the uterine cavity at a rate of approximately 20 microgram/day. The LNG IUD is about as effective as sterilization, but, unlike sterilization, it is easily reversible. These devices act mainly by local progestogenic effects and act for up to 5 years.