Like drinking a cup of coffee, a caffeine pill can provide a temporary boost in energy, memory and focus. It is a popular way to improve alertness and concentration while studying or working. Although these pills can help a person study or stay awake, high doses of caffeine can cause side effects and may not be safe for everyone, but they are safe if taken in moderation. However, some people are more sensitive to the effects than others and may experience side effects from these supplements and other sources of caffeine. This pill can relieve both migraines and tension headaches, possibly because it reduces a person’s perception of pain.