Free Sample Vivarin
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From their website:
Vivarin is not a substitute for sleep. You need sleep. (I know I do.) Vivarin is not for children under 12.
One Vivarin tablet contains as much caffeine as a cup of coffee. Limit your use of caffeine in medications, foods and drinks while taking Vivarin 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.