Venlafaxine is totally stimulant! It's a SNDRI (So this means that it reuptakes all monamines like serotonin, norepiphrine, and especially dopamine from your synapses instead of just one like an SSRI like prozac or zoloft would do, reuptaking just serotonin) so it's a triple reuptake inhibititor with a really adrenegic feel, especially if you take the immediate release, ie the tablet you have to take to take three times time a day, 75 to start and then 150md three times a day for maximimum daily amount of the drug for very great effects in my opinion.
It also has additional effects on the opioid system, similarly mirtazapine.
The 75mg three times a day is mild and not enough to therapeutic effect of the drug; you need to take 150mg of the drug tid for good effect if it is the immediate release
I've only eve taken 225mg of the XR version and have found it quite effective for anxiety and depression of good scale, but with sexual side effects.
Once again it is quite stimulating.