Take it from someone who has experienced it, you don't want to stay on ECA too long. I spent 2 years using it too much and the effects were not good. Reduced blood flow/enlarged prostate; nerves felt like they were blown out.
This may not sound too severe, but you will have a much healthier feeling in general if you use the ephedrine 2-4 weeks at a time, and stay off it much of the year.
Try alternatives like norephedrine, yohimbine, green tea extract, etc.
One of the problems I had with ECA "abuse" was overtraining. 3 hrs. in the gym - no problem. I would rest 10 mins and feel like I could just keep on lifting. Rollerblade to Timbuktu? No problem, 4 times a week.
After awhile you're just wearing out your body as opposed to the real goal which is to burn fat and get a slight boost.
I hear some guys here pop 5-6 ephedrine pills before a workout. I don't know how they do it!!!
Oh yeah I was also getting the pounding heart and high heart rate, lack of sleep, etc. My heart rate is much lower now that I don't use ephedrine.