Are Zoladex And Lupron Depot Injections Required?

hi, i have a query, i was dioganosed with an overian cyst with a fabriod in my utruss. through lapro both the things have been taken out.now my gino is advising me to go for zoladex or laprodepot injection. i want to know is it really reqiured to go for the same also what is the use for it and is there any side affects?