Adrenaline stimulates the release of glucose from the liver and free fatty acids from body fat stores. In turn, this helps to increase the availability and use of both fat and glucose for ATP production. Often times, ephedrine is combined with caffeine in order to double the weight loss effects. However, the effects of ephedrine are truly dangerous. Symptoms include high blood pressure, irregular heartbeat, tremors, seizures, heart attacks, strokes, and death. So, keep away.