Actually caffeine via No-Doze is in the "sulfate" form which absorbs alot faster and will definitely make you jittery. And 100mg is more than is in a typical strong cup of coffee.
In coffee its alot less jittery. If you like the effects of coffee not tripping, you should like it tripping as well.
Also, the Xanthines in a tea called Yerba Mate include caffeine but also other forms that are more head-clearing and less jittery and less effect on the heart. It is GREAT stuff and has a wondrous smoky flavor & aroma that is pure heaven while tripping. Go with the Guayaki brand, now on most major grocery story chain shelves, either with the other teas or most likely in the "Organic" isle. Taste is superior to others, and proceeds go to support indigenous farming and rainforest protection