I'd take about 2 dropper's before I walk in the gym. I'd warm up and do abs-about 20 mins later I was ready to attack the weights with a relentless fury. I never took them more than 2 wks (ED)at a time with 4-6 weeks off in between. Personally, I think you have to absoluely zero self respect to use them. They're just way too toxic. The only legit reason I could see using them for is a powerlifting contest. I haven't touched them in 15 yrs-and wouldn't take them again even if they were given to me for free. There's other stuff out there that will give you better results that aren't nearly as toxic.
Oh yeah, they'll bring out the worst in you attitude-wise. While using them I got kicked out of 2 different gyms for being a dick to other members. Normally I wear headphones and keep to myself, but when I was using CD and some gym newbie would exhibit poor gym etiquette, I felt deeply obligated to let them know on the spot. I wasn't exactly nice about it either. In retrospect I believe it was the CD talking, not me. I'm still surprised I never got shot by somebody I was an asshole to.