The ECA stack is a slang term for the combination of the drugs ephedra, caffeine and aspirin. These drugs, are commonly taken together as a fat burner and stimulant. Ephedra and caffeine work synergistically to stimulate the nervous system and speed metabolism, while aspirin prolongs the effects of ephedrine. As with any drug, this combination of compounds has inherent risks that should be considered carefully. While the sale of ephedra is illegal in most states, it is still available in synthetic form as ephedrine.
Heart Attack
The ECA stack is a powerful central nervous system stimulant. Caffeine and ephedrine will both raise blood pressure and speed heart rate. According to the Mayo Clinic, the combination of ephedra and caffeine is especially powerful and increases the risk of heart attack.
Anxiety
Due to its CNS stimulating effects, some users will find that the ECA stack raises anxiety levels. According to the Student Nutrition Action Committee of UCLA, the chemical effects of the ECA stack are the same as those experienced during the "fight or flight" response. Those susceptible to anxiety should steer clear of the ECA stack.
Dehydration
Caffeine is a potent diuretic, increasing urine production. Additionally, the ECA stack raises body temperature, causing you to lose more water due to perspiration. Anyone experimenting with the ECA stack should be sure to consume plenty of water and monitor body weight.
Insomnia
Caffeine is the most commonly used drug to increase alertness. Ephedra is also known for its fatigue fighting effects, The combination of these two drugs can make it very difficult to fall asleep, especially when combined with aspirin, which prolongs ephedra's effects. The ECA stack should not be taken close to bed time. Some users will find that taking this stack at any time of day will interfere with normal sleep patterns.
Heat Stroke
Ephedra and caffeine stimulate metabolism and increase body heat. When combined with warm weather and exercise, heat stroke becomes a dangerous possibility. According to the University of Maryland Medical Center, Ephedra, combined with warm weather and a predisposition to heat exhaustion played a role in the death of Orioles pitcher Steve Bechler.
