Phase 1 · Understand the Body — Why the disease behaves the way it does.
The One-Line Truth
The whole disease in one chain
Everything on this page exists to explain this line.
Cocaine, meth, or MDMA flood the brain with dopamine and norepinephrine—the heart races, blood pressure spikes, body heat soars, and thinking goes off the rails.
The Stuck Gas Pedal with Cut Brakes
Imagine your brain's dopamine and norepinephrine systems as a car's engine and accelerator. Normally, the gas pedal (the transporters that recycle these chemicals) lets you press down and then spring back—smooth control. Stimulants are like jamming the gas pedal to the floor AND breaking the spring so it cannot return. The engine (nucleus accumbens and sympathetic nervous system) roars at full throttle. Meanwhile, the prefrontal cortex—the driver's rational mind that should pump the brakes and say "slow down, you'll crash"—gets so overwhelmed by the noise and speed that the driver goes silent and just holds on. The body (heart, blood vessels, muscles) tries to keep up by working harder and harder, but without functioning brakes, the car overheats, the engine seizes, and crashes are inevitable.
American College of Emergency Physicians (ACEP) 2023 toxicology guidelines · SAMHSA Treatment Improvement Protocol (TIP) 33: stimulant use disorder · American Heart Association scientific statement on cardiovascular complications of cocaine and methamphetamine · UpToDate clinical review on sympathomimetic toxicity · reviewed 2026-07-07