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Ephedrine isn't what you want to be taking to stay alert. Hardknocks had it right - a lot of us work in hot weather and heatstroking from ephedrine is bad news. It can also do major damage to your heart. Avoid it. It can wreak havoc on your bloodpressure and cause strokes. Not the way to impress your client. True stamina outweighs artificial stamina any day.