Restlessness, nervousness, flushed face, muscle twitching, and tachycardia are symptoms of which intoxication?

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These signs point to caffeine intoxication, a stimulant effect from taking a large amount of caffeine. Caffeine boosts the body's sympathetic nervous system activity, which explains the restlessness and nervousness you’re seeing. The same stimulation also increases heart rate, causing tachycardia, and can produce a flushed face and muscle twitching from heightened neuromuscular excitability. In short, the combination of CNS arousal with a faster heart rate and flushing is a classic pattern for caffeine intoxication, especially after consuming a lot of caffeine in a short period. Alcohol intoxication would more likely show impaired coordination and slurred speech; cannabis intoxication often includes red eyes and slowed reactions; nicotine withdrawal brings irritability and difficulty concentrating rather than tachycardia and flushing.