I get 6 month Lupron shots. More like a silver dollar pancake than a "lump", and it lasts. Never occurred to me to care how long it lasted, but I notice it at times. I've never had significant side effects from the injection itself other than a bit of soreness on the drive home if I get the one lab nurse who doesn't really understand how to do the injection.
I get mine in my hip, always the same general spot.
My Prolia goes in the gut every 6 months.
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Moderator - Prostate Cancer(Not a medical professional)
IGRT journey (2010) - www.healingwell.com/community/default.aspx?f=35&m=1756808
HT (Lupron) 9/12-3/13, 6/14 to present
Prolia 6-mo inj 12/12 to present
Casodex 12/14, end 3/15 after psa 30% rise
Zytiga 04-07/15 Xtandi 04/16-8/17
RT for spine mets 9/18