Clomid, the most well-known fertility drug, also known as clomiphene citrate and it is used to treat ovulation problems (anovulation). Clomid is often used in the treatment of irregular cycles and of polycystic ovarian syndrome (PCOS) related infertility. About 40 to 45% of couples get pregnant within six months of treatment.

Clomid is widely used as an ovulation induction agent and should only be used for three ovulatory cycles unless the patient in under the care of a fertility specialist. Ovulatory dysfunction is a common cause of female infertility, occurring in up to 40% of infertile women.