Gonarelix belongs to a group of medicines called “anti-gonadotrophin-releasing hormones” which act against the actions of the natural gonadolrophin releasing hormone(GnRH). Gonarelix is used for In women undergoing assisted reproduction techniques. including in vitro fertilisation (IVF) and other methods. occasionally ovulation may occur too early causing a significant reduction in the chance of getting pregnant. Gonarelix is used to prevent the premature LH surge that might cause such a premature release of egg cells. In clinical studies gonarelix was used with recombinant follicle stimulating hormone (FSH) or corifollitropin alfa. a follicle. stimulant with a long duration of action.