I have been on prozac since the mid 1990's for PTSD and never had any indication of dysautonomia until June of last year. I don't think prozac is a cause for my dysautonomia. BUT that is me. You could be completely different. I do know that my wife has, in the past, taken some of the same drugs I do now. They caused miserable side effects for her and, apparently, none for me. Everyone is different. I think it is best to consult your doctor.
Hi I am not sure about dysautonomia in general but the link below takes you to a list by Dr. Blair Grubb stating medications that can cause or worsen Orthostatic Intolerence:
http://circ.ahajournals.org/cgi/content-nw/full/117/21/2814/TBL1189801
I think Prozac is not a Tricyclic antidepressant, I think it is a SSRI.
I don't know if Prozac can cause it, but a number of years prior to my being be diagnosed with I.S.T. and P.O.T.S., I took that drug for a time, prescribed by a neurologist as a migraine preventative. Currently, I am not on the drug, but I still have have orthostatic tachycardia, get light headed, and fatigue. I had never heard that before about Prozac! How's it supposed to mess with blood pressure?