Vivarin Caffeine Alertness Aid Tablets help you stay awake and alert when you need it most. Vivarin tablets are safe and effective Functional Caffeine. Use 200mg Vivarin Caffeine tablets to help restore mental alertness or wakefulness when experiencing occasional drowsiness. Great for when traveling, during long business hours, studying for college exams, or when general drowsiness occurs and limits your ability to stay alert. Each tablet provides 200mg of caffeine, about as much as a cup of coffee but in a fast and convenient tablet. Take Vivarin Caffeine tablets with you when you need mental energy to power your day. Limit your use of caffeine in medications, foods, and drinks while taking Vivarin tablets because too much caffeine may cause nervousness, irritability, sleeplessness, and occasionally, rapid heartbeat. For occasional use only. Not a substitute for sleep. If drowsiness persists, consult a doctor. Not for children under 12.