This Coffee Promises To Keep You Up For 18+ Hours

It’s about 80 times stronger than a shot of espresso.

If you need a coffee IV every morning in order to jump-start your day, it’s about time you learned about the “Ass Kicker,” an iced coffee beverage promising at least 18 hours of energy

The potent brew was developed by an Australian barista for an ER nurse who had difficulty staying awake for unexpected night shifts and boy, does it deliver. The nurse said she drank the Ass Kicker slowly over two days and it kept her up for three. That’s three entire days.

So what’s in it?

• A quad shot of espresso
• 4 ice cubes made from 48-hour cold-drip coffee (each with as much caffeine as 2 espresso shots)
• 4 ounces of 10-day cold brew
• Oh, and then 4 more cold brew ice cubes

That comes out to a whopping 5 grams of caffeine (an average espresso shot has just 60 milligrams). To coffee connoisseurs, it sounds like a welcome challenge, but to some medical professionals, it sounds just plain dangerous.

Scientists estimate that 10 grams of caffeine could kill you, while dietitian Tanya Lewis said that plenty of people have been hospitalized from a caffeine intake of less than half of what is in the Ass Kicker.

The Australian cafe does serve the Ass Kicker with a medical warning for those with high blood pressure or a history of heart problems. The staff also makes it a priority to explain that it’s meant to be consumed slowly over multiple days rather than chugged in a risky dare.

So, if you’re feeling up to getting your ass kicked with caffeine, see what your barista says when you place an order for a cold brew with a quad shot of coffee. Or just plan a trip to Australia—you’d definitely have the energy to make the most of your vacation time.