Yonsa

Yonsa is a prescription medication used in combination with methylprednisolone to treat a condition known as metastatic castration-resistant prostate cancer (CRPC), prostate cancer that keeps growing even when the amount of testosterone in the body is reduced to very low levels. Many early-stage prostate cancers need normal levels of testosterone to grow, but castrate-resistant prostate cancers do not.

Yonsa belongs to a group of drugs called cytochrome P450 17 (CYP17) inhibitor, a substance that blocks the activity of proteins involved in sex hormone production. Yonsa works by reducing androgen production in the body. Androgens are male hormones that can promote tumor growth in the prostate gland.

This medication comes in tablet form and is taken once daily, with or without food. Do not chew, divide, or break Yonsa tablets. Swallow tablets whole.

Common side effects of Yonsa include joint swelling, hot flushes, and diarrhea. Yonsa can also cause dizziness or lightheadedness. Do not drive or operate heavy machinery until you know how Yonsa affects you.