Yes, I beleive it is very normal. I am on Ritilin generic, but I experience very much of a stimulant effect. I'm not sure about this, but it seems as if children tend to have the effect of calmness, which is opposite of what these drugs are designed to do. I think in adults, the meds help us focus and give us the enrgy and lift the depression to help us with our adhd. The problem I am finding is that I am seeing it not working as well as time goes on and find myself wanting to take more that my prescribed dose. Unfortunately, these drugs are addictive in nature and that is posing a problem for me. Be careful with the side effects, and if you find yourself liking it too much, you mightwant to consider a non-stimulant like strattera. I hope this helps. Thanks so much and I am adding youas a friend ny the way. P.S.- I used to be on prozac and now on effexor.