I am an occasional stimulant user (30 mg Vyvanse 0-5 days/week) and experience anhedonia most of the time. It's been going on for a while, with occasional breaks that are like hypo-hypomanic episodes. For a long time I thought it was a symptom of depression but it usually persists independent of mood.
I have tried tianeptine (Stablon, manufactured by Servier) and it seems to do nothing for me, although I've never actually used it as indicated while not taking another serotonergic drug. I have taken doses ranging from 12.5 mg (3x daily for a few weeks, while on Zoloft and/or Zyprexa and perhaps on its own) to 187.5 mg (one-off, while on Zoloft) and have never felt euphoria. I may try it again once I am off the Zoloft.
I am a fast responder to SSRIs & become hypomanic on them. Besides sleep loss, excess spending, and disinterest in taking care of myself, Zoloft is an excellent antidepressant for me. It doesn't quite fix anhedonia for normal everyday activities, but gives me way more motivation in working towards interesting projects than any stimulant I've ever taken. The closest cure for anhedonia I have right now is a very low dose of Zoloft + a few other drugs + a few drinks. Not good or sustainable at all, but it makes it possible for me to enjoy life for a few hours. Zoloft greatly potentiates alcohol for me.
Pramipexole (dopamine receptor agonist) is of interest to me. I may be able to get it prescribed (or try it on my own if I really want).
Tranylcypromine (Parnate) is also something I would like to try, but I'd have to stop taking 2 or 3 other drugs right now in order to try it safely and I don't think I would be able to do that without falling into depression and becoming unable to work. I've taken another MAOI,
selegiline (Emsam transdermal patch), but it had no effect.
At some point in the past two years, I lost the ability to feel euphoria on drugs. Ritalin + alcohol used to be ecstasy-like for me; last time I tried it it barely worked, while taking no other drugs besides weed. Hydrocodone was quite euphoric too and I got no nausea, also while on weed - hydrocodone and oxycodone are actually dysphoric now.