While moderate caffeine consumption is generally safe for most people, excessive intake can lead to caffeine toxicity. Symptoms of caffeine toxicity include restlessness, insomnia, headaches, dizziness, rapid heartbeat, and in severe cases, seizures and cardiac arrhythmias. The lethal dose of caffeine is estimated to be around 10 grams, which is roughly equivalent to the caffeine content of 100 cups of coffee.
