We workout at 5:30 AM, so I've been using ephedrine on a normal basis for months. If you're trying to gain weight though, I'm not sure I'd recommend it. I'm at 180 off of 200. Given, I'm losing a little weight right now for my wedding, so it's not all the ephedrine. If you eat like a crazy freak you should still not have too much trouble gaining weight. Maybe just stick to the ephedrine on ME days, and lay off of it the rest of the time. Remember that in most cases involving ephedrine, weight loss only occurs with consistent use (2 pills 3 times a day or whatever). So your metabolism won't see to much of a difference with rare usage.