It's a gondotrophin analogue, it basically lowers the production of follicle stimulating hormone (fsh) and lutimising hormone (lh). Both of these hormones are responsible for the production of the primary Sex hormones in the gonadal tissue i.e. Testosterone in males and oestrogen in females.
It's given in a implant for, and in m2fs in the UK it is the primary anti androgen method prescribed. It basically gives a chemical ochi, hormone wise anyway!
Hey Jebee, I've only been on Zoladex for just over a year I didnt know any one was on it for 11 years!