Hi I was on Prozac for 15 years on 20mg and it was excellent - gave me my life back until October seemed to stop working after some trauma going on then.
It is a very good medication for depression - very stimulating and tbh found the initial start up effects quite nasty! but it was worth it! You do tend to feel worse before better - think this applies to most of them. It took around 8 to 12 weeks for me to feel better - didn't have side effects for that long. I went back on it again after Xmas and it made me ill - as if I served you well once now clear off! I am on Citalopram as of 2 weeks and upping the dose to 40mg at the weekend - am under a psychiatrist now albeit private as been diagnosed with OCD (Pure) so hope this one helps - having a pretty rough ride 2 weeks into them? Hope they work as he said Plan B would be Effexor.
Good Luck - it was a miracle medication for me and truly changed my life.
Laura