Ovulation induction refers to the use of fertility drugs to induce ovulation in a woman who does not ovulate herself.

The drugs used are tablets such as Clomid, Tamoxifen or Letrozole or injections of the hormones FSH ± LH. These same drugs may also be used in women who are ovulating themselves. The drugs therefore ‘boost’ ovulation and their use in these women is referred to as superovulation.

The dose of fertility drug used is critical and varies from woman to woman. Some women may over-respond to a particular dose while others may not respond at all. Therefore close monitoring of follicle (sac containing egg) development is necessary. This is done with transvaginal scanning. Once the follicles reach 18mm, ovulation is likely to occur within 48 hours. The couple are advised to have intercourse over the following days.