Lexapro changed my husband's life in a good way. However, in spite of the fact that the generic, escitalopram, is supposed to be the same as Lexapro--he tends to spiral downhill as you mentioned a few weeks after switching to the generic. We have tried switching several times as the name brand is so expensive, but each time his mood deteriorates after a couple of weeks--and we go back to Lexapro.
This is kind of a recient thing. Lexapro indeed is now avalible in a generic form, Escitalopram, or sometimes called Cipralex.
I used to take Lexapro for about a year, but never tried the generic counter part as they were not avalible at that time.
Your question: "Is there that much of a difference in brand name and generic brand?"
Well, there isn't supposed to be. In fact by FDA law all Generic medications must have the exact amount and kind of active ingreduant. BUT, there is some evedence that in some (not all) cases that Generic equivilent medication can (sometimes) be less effective.
My Psychiatrist told me that with Generics he has noticed approximatly a 20% less effective result verses name brand SSRI medications.
Now, is this fact. NO. But I would also have to ask you how long your boyfriend has been taking Lexapro.
This factor is key, because if he has been taking it for a very long time there is a 20% chance that the active ingrediant in Lexapro which is "Escitalopram," has lost it's effectiveness for him.
I pooped out on Lexapro in 2 years. That's why some people like us make med changes. Because we "poop out" after long periods on the same AD medication.
I'm not saying that's your boyfriends problem, just saying it is a real possability.
Your on the right track as to finding a solution to his problem. Keep doing research and asking questions. You can solve this medication riddle if you try.