The amount of caffeine in 5-Hour Energy Extra Strength is 200mg per 2-fluid-ounce shot.
This amount of caffeine is about the same as two eight-ounce cups of coffee (which can range from 100 to 145mg depending on the type and strength of the brew).
As with any caffeine product, monitoring and limiting your intake is important to avoid possible side effects such as insomnia and jitteriness.