False statement about Mirena is :
**Core Concept**
Mirena, a levonorgestrel-releasing intrauterine system (LNG-IUS), is a type of hormonal contraception that uses a progesterone-like hormone to prevent pregnancy. It works by thickening the cervical mucus, thinning the uterine lining, and potentially affecting ovulation.
**Why the Correct Answer is Right**
The correct answer will be a false statement about Mirena, which means it will not align with the mechanisms or properties of LNG-IUS. The LNG-IUS releases a small amount of levonorgestrel, a synthetic progestin, which is absorbed by the uterus and surrounding tissues. This local release of levonorgestrel is responsible for the contraceptive and therapeutic effects of Mirena.
**Why Each Wrong Option is Incorrect**
**Option A:** Mirena is not a type of estrogen-based contraceptive. This is incorrect because Mirena is a progestin-only contraceptive, not an estrogen-based one.
**Option B:** Mirena does not increase the risk of endometrial cancer. This is incorrect because Mirena has a protective effect against endometrial cancer due to its local release of levonorgestrel, which reduces the risk of endometrial hyperplasia and cancer.
**Option C:** Mirena is not effective in treating dysmenorrhea. This is incorrect because Mirena has been shown to be effective in reducing the severity of dysmenorrhea (menstrual cramps) due to its local release of levonorgestrel, which reduces uterine contractions and prostaglandin production.
**Clinical Pearl / High-Yield Fact**
Remember that Mirena is a local release system, which means that the levonorgestrel is released directly into the uterus, reducing systemic side effects and increasing efficacy. This is in contrast to oral contraceptives, which release hormones into the bloodstream.
**Correct Answer: D.**