Mifepristone is used in management of:
**Core Concept**
Mifepristone is a synthetic steroid with potent glucocorticoid receptor antagonist activity and progesterone receptor antagonist activity. Its unique mechanism of action allows it to be used in various clinical settings.
**Why the Correct Answer is Right**
Mifepristone is primarily used in the management of **Cushing's syndrome**, a condition caused by excess glucocorticoids. As a glucocorticoid receptor antagonist, mifepristone blocks the action of cortisol, thereby alleviating symptoms of Cushing's syndrome. Additionally, mifepristone is also used as an emergency contraceptive, where it inhibits progesterone action, preventing implantation of the fertilized egg.
**Why Each Wrong Option is Incorrect**
**Option A:** Mifepristone is not used in the management of **preeclampsia**, which is a condition characterized by high blood pressure and proteinuria in pregnancy. The primary treatment for preeclampsia involves blood pressure control and delivery.
**Option B:** Mifepristone is not used in the management of **breast cancer**, although it may be used to treat certain types of prostate cancer. Its primary mechanism of action is as a progesterone receptor antagonist, which is not directly relevant to breast cancer.
**Option C:** Mifepristone is not used in the management of **hypothyroidism**, which is a condition caused by inadequate production of thyroid hormones. Treatment of hypothyroidism typically involves replacement with synthetic thyroid hormones.
**Clinical Pearl / High-Yield Fact**
Mifepristone's unique mechanism of action as a glucocorticoid receptor antagonist makes it a valuable treatment option for Cushing's syndrome. However, its use is contraindicated in patients with a history of **eclampsia** or **preeclampsia**, as it may exacerbate these conditions.
**Correct Answer: C. Cushing's syndrome**