This sort of explains it
Medical shutdown of the ovaries
Medicines can be used to temporarily stop the ovaries from making estrogen. Two of the most common ovarian shutdown medicines are:
Zoladex (chemical name: goserelin)
Lupron (chemical name: leuprolide)
Zoladex and Lupron are both luteinizing hormone-releasing hormone (LHRH) agonists. These medicines work by telling the brain to stop the ovaries from making estrogen. The medicines are given as injections once a month for several months or every few months. Once you stop taking the medicine, the ovaries begin functioning again. The time it takes for the ovaries to recover can vary from woman to woman.
Deciding to have your ovaries shut down with medicine or surgically removed requires a lot of careful thought and discussion with your doctor.
Taz x