<prompt> GnRh analogues are used inOvulation inductionEndometriosisFibroidAll of the above  <response>: GnRh includes both agonists and antagonists. Used for ovulation induction, fibroid and endometriosis . It induces a state of pseudo menopause were there is a deficiency of both estrogen and progesterone so that fuher growth of fibroid and endometriosis does not occur. To overcome the distressing se of menopause EP are added which is called as Add Back regime. Other condition in which they are used is true precocious pubey in which there is activation of HPO axis . 