You will still benefit from taking ephedrine by itself but if you are really looking to get the most out of it then adding caffeine to it will help. Ephedrine will boost your metabolism and suppress your appetite helping with weight loss and the caffeine adds a thermogenic effect.

My suggestion is to slowly build up your tolerance and when your comfortable ramp it up or add to the stack. It's not uncommon for it to feel really strong as first especially if you are taking it before a workout where you will notice an increased heart rate and sweating. Slowly building a tolerance will also help avoid the side effects.