I don't find it stimulating like amphetamine or an actual stimulant, but it keeps me awake for fucking ever. It also gives a lot of restless limb energy if I don't channel the body feeling into physical activity. But I don't experience increased heart rate, palm, sweating, or any other symptoms of stimulants. Curiously, if I take it and try to sit around the house, the come-up feels very stimulating and unpleasant, I yawn constantly, my eyes water, I writhe around and feel a very heavy bodyload. But if I even just walk around during the come-up, I feel 100% good and comfortable.
Agreed that it is mentally stimulating... I become more social than usual on it (although sometimes I can still get some social anxiety when it comes to people who aren't part of my trip... but then other times, I want to talk to everyone). Without fail, everyone along for the ride ends up talking endlessly, about an incredibly wide range of topics, with a central theme of the nature of humanity/the world. verbal eloquence is always on the table. Or if I'm by myself, my internal dialogue does the same. In fact I would say the central theme of DOXs in general is the piercing thought process that seems to want to get to the core of understanding of whatever it is applied to.