Chorionic Gonadotrophin Injection 5000 IU is a medication used in fertility treatments to trigger ovulation in women who have ovulatory dysfunction. It is a hormone produced by the placenta during pregnancy and can also be used to treat male infertility. Chorionic Gonadotropin injection is available in various strengths, including 5000 IU. It is usually given about 24 to 48 hours before ovulation is expected to occur, to help release the mature eggs from the ovaries.