Which of the following is a sign of caffeine intoxication?

• A. Insomnia, cardiac arrhythmias, restlessness
• B. Sedation and drowsiness
• C. Weight gain
• D. Hypotension

Answer: (A)

Caffeine is a stimulant, so intoxication shows up as heightened arousal and activation of the sympathetic nervous system. When someone consumes a large amount, you commonly see insomnia and restlessness as the CNS becomes overactive, and there can be cardiovascular effects like tachycardia or cardiac arrhythmias. These signs—sleep disturbance plus restlessness and heart rhythm changes—fit the profile of stimulant intoxication.

Sedation and drowsiness would be the opposite of a stimulant effect. Weight gain isn’t an immediate intoxication sign, and caffeine often has the opposite effect on appetite for many people. Hypotension also doesn’t align with caffeine’s typical cardiovascular impact, which more commonly includes elevated blood pressure.