Use Caffeine (No Doz) exactly as directed on the label, or as prescribed by your doctor. Do not use in larger or smaller amounts or for longer than recommended.Use exactly as directed on the label, or as prescribed by your doctor. Each dose of this product usually contains about as much caffeine as a cup of coffee, a can of cola, or one energy drink. Do not use more of this product than is recommended on the label. The US Food and Drug Administration (FDA) recommends not consuming more than a total of 400 milligrams of caffeine per day in any form. You may take the caffeine tablet with or without food. Do not chew more than 2 pieces of the caffeine gum at one time. Do not swallow the gum whole. Store at room temperature away from moisture and heat.