Grizz, it's funny you mention that. I do not recommend high dosages but at 25mgs of
ephedrine and 2.5mg's of yohimbine, it's a very effective fat burner over time.
When I was experimenting with dosages one time I took 50mg's of
ephedrine and 10mg's of yohimbine, downed with 2 cups of coffee. By the time I got to the gym 15 minutes later, my heart was racing. By the time my warmup was done, I was Done! I had the cold sweats and thought my heart was going to explode and felt like I was going to barf. I really felt like I could die from either a blood vessel or my heart bursting.

All I could do was go home and wait it out.
Lesson learned is start low and go up slowly.
Best to you!
MaxRep