Second opinion on biopsy

I started out with a Gleason 7 3+4. Hospital of excellence reevaluated my biopsy and came up with a Gleason 7 4+3. I decided on doing 28 rounds of IMRT and the space oar. Oncologist wants me to do a short course (2months) of ADT before radiation starts. He said 1 short in beginning and 1 shot at end. Can anyone give me a little insight on ADT side effects. Thx