I am currently running the ALRI tri-lean stack which contains venom hyperdrive. I can't say that I get any real rush of energy after dosing it with breakfast, I also did not have any decrease in appetite.
Did you take any other stims with the first venom dose? Perhaps it was just a strong placebo effect based on your expectations of the product.
If your looking to decrease your appetite Zappetite by Thermolife has worked well for me.