Wake-Ups Caffeine Tablets help restore wakefulness and reduce drowsiness. Each tablet contains 100 mg of caffeine. Directions: Adults: Take 1 or 2 tablets every 4 hours as required, not exceeding 10 tablets in 24 hours. Caution: Not recommended as a substitute for sleep. Consult a doctor if you have high blood pressure, heart condition, or are pregnant or breastfeeding.