How much caffeine is too much?

If you’re pulling an all-night study session or dragging yourself to class Monday morning, you might be tempted to grab a coffee or an energy drink to keep you going.

Caffeine is like magic when you need to stay awake and alert. With the multitude of caffeinated products on the market, from sodas to energy drinks to coffee beverages, it’s easy to fuel up when needed.

The problem is that too much caffeine can actually have negative side effects like headache, nervousness, insomnia, and fast heartbeat. In extreme cases, too much caffeine can lead to seizures and a visit to the ER.

To see how much caffeine your favorite beverages contain, visit The Atlantic’s “How Much Caffeine Before I End Up in the E.R.?” for a list of common drinks and associated caffeine content.