Acute intentional caffeine overdose treated preemptively with hemodialysis.

Caffeine is the most commonly used central nervous system stimulant. While it has a high LD (150-200 mg/kg), when ingested in significant quantity, caffeine can lead to severe and even lethal side effects. Manifestation of toxicity include tachyarrhythmias, seizures, and metabolic derangements which can eventually lead to cardiovascular collapse and death.