Rohto eye drops (the astringent kind that are like Altoids for your eyes) help keep me awake and feel awesome if you've been staring at a computer screen too long.

I would say stick with stimulants you know. If you've been drinking coffee for a while, get a quad shot latte or something. That way if your heart starts racing you won't make matters worse by thinking you've overdone it on some unknown energy drink.