For some people, it takes a few days to get used to the new medication. Try a smaller dose, as Wiz suggested, and ramp down on the coffee. Also, make sure you take it early in the morning, and none after 12.

You are going to have to find out what's going to work for you.

I take 400 mg and drink 3-4 cups of coffee a day...and still fight fatigue...but without it, I would be even worse.