energy drinks + stimulants
Energy drinks layer caffeine, taurine, and guarana on top of any prescription or recreational stimulant (amphetamine, methylphenidate, modafinil, pseudoephedrine, cocaine), pushing heart rate, blood pressure, and central nervous system arousal in the same direction. Because the effects work along overlapping pathways, the combination can produce more strain than either source alone, raising the risk of palpitations, blood-pressure spikes, severe insomnia, and anxiety.