Hi badger. I had to look it up to see if Zyprexa contributes to the syndrome you mentioned. I'm not a great researcher so I didn't find much to implicate that medication in Serotonin Syndrome. I found one report of there being an association, but that was in a patient also treated with citalopram & lithium.

I took a big dose of Zyprexa for years along with fluoxetine and never had such a reaction, fortunately.

Maybe I didn't answer your question well, and if so I apologize. I'm just going with what I know and what experience I have with this medication. It's a good one if you can curtail the body weight changes that can occur while taking it. Good luck badger.