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Fertility Glossary

GnRH antagonist

A medicine that quickly blocks the hormone surge causing early ovulation.

Antagonists are started partway through stimulation, allow shorter protocols and are often preferred where the risk of overstimulation is higher.

Related terms

GnRH agonist

A medicine that first stimulates and then suppresses the body's own hormones.

Ovarian stimulation

Injections used to grow several follicles at once.

Ovarian hyperstimulation syndrome (OHSS)

An over-response to fertility medication causing swollen, painful ovaries.

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