I've taken Lofepramine (Gamanil) which is related, for many years, on and off. It's one of the few drugs I don't have any major side effects with and it helps me sleep without knocking me out during the day. I do think that I've noticed that the effect lessens after a while. I've found it works better after stopping for a while. (gradually of course).
I have terrible problems with SSRI's and Mirtazapine. Strangely enough many people comment on weight gain yet I seem to control my weight better whilst taking it. It doesn;t affect my sex drive like SSRI's either ! Don't know if you are male or female ? it messed up my cycle, but that's the only problem I had.