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 Enabling Cookies in Mobile Safari (iPhone, iPad) ||||| A cafe is serving up the coffee to rival all others and it looks almost fatal. 
 
 The suitably-named Ass Kicker is being served at Viscous Cafe in Adelaide, Australia and it contains the caffeine equivalent of 80 standard cups-o-joe. 
 
 Legend has it, the first incarnation of the beverage was made for an emergency department nurse who needed to stay awake. The drink was consumed over a period of two days and kept the nurse up for three days in total. 
 
 Since then, Viscous Cafe owner Steve Benington has "toned it down a little" for general sale but the drink it still comes with a warning that it is not for the faint of heart. 
 
 The drink apparently tastes more like toffee than coffee and is designed to be consumed over a long period of time, with Benington telling Mashable his creation aims to "lift you up and keep you there instead of peaking through the roof and dumping you hard later." 
 
 For those chasing an instant hit, be warned; not all the caffeine in the drink is released immediately. "Combining the minimum drinking time and the slow release of cold drip-imparted caffeine is how we achieve the sustained uptime" Benington said. 
 
 Some pointed out that while the beverage packs a serious punch, some say it could also pose a serious risk to health, if consumed too quickly or by those with high blood pressure. 
 
 A fatal dose of caffeine for a healthy adult is considered to be roughly 18 grams of caffeine consumed over a one to two hour period. A large Ass Kicker has five grams of caffeine and is recommended to to be consumed over a three to four hour period. 
 
 As Bebington said "some people love it and some are broken by it, but it’s all in the name of fun." ||||| (CNN) How many cups of coffee does it take to get you going in the morning? 
 
 If the answer is many, the invention of a turbo-powered superbrew that is so strong it comes with a health warning might put your habit into perspective. 
 
 A cafe in Adelaide, Australia, is serving the "Asskicker," a concoction of four espresso shots, two different strengths of cold drip and milk that its inventor says contains 80 times the amount of caffeine of a standard shot. 
 
 The drink, designed to be sipped slowly over three to four hours, promises to keep coffee lovers buzzing for up to 18 hours. 
 
 Turbo coffee 
 
 Steve Benington, owner of Viscous Coffee , developed the drink for a local emergency room nurse who needed something to keep her going during unexpected night shifts. 
 
 "We had to tone it down a bit because it kept her up for a total of three days," said Benington, adding that the nurse sipped it over two days. 
 
 Friday fuel to get us to the weekend // Buzzing // #cupofjoe #coffee #siphonthat A photo posted by Alpha Box & Dice (@alphaboxdice) on Mar 26, 2015 at 2:38pm PDT 
 
 The barista, who opened his cafe a year and a half ago after a career in the Australian Navy, said the turbo coffee has become very popular in recent weeks. 
 
 However, he actively discourages customers interested only in a gimmick, and advertises it with a warning for those with high blood pressure or heart conditions. 
 
 "I have a quite detailed talk with people before they actually purchase one. If I can talk someone out of it, they're not ready for the drink," said Benington. 
 
 Warning signs of coffee overdose include shakes and sweats, dilated pupils, stammering over your words, vertigo and nausea. 
 
 "If you keep going, those symptoms will get worse," said the coffee-loving business owner. "If you stay within the guidelines, you're fine." 
 
 The Asskicker experience will set you back around $12 ($16 AUD) for a 16 ounce cup. 
 
 World's favorite drug 
 
 Occurring naturally in coffee beans, tea leaves and cacao, caffeine is the most commonly used drug in the world. 
 
 The average amount of caffeine consumed by adults is 300 milligrams per day, according to a 2012 FDA report (PDF). Caffeine is a bitter white alkaloid that stimulates the central nervous system -- the brain, spinal cord and nerves -- to make us feel more awake. 
 
 While studies have not proven (PDF) that caffeine produces significant life-threatening health risks such as cancer or heart disease, excess consumption can lead to increased blood pressure, gastrointestinal problems and raised cholesterol. 
 
 Though rare, there have been some deaths linked to caffeine. A 14-year-old with a heart condition died after drinking two energy drinks in 24 hours. A 19-year-old overdosed on a dozen caffeine pills, and in another case, a high school wrestler from Ohio died after consuming powdered caffeine -- a highly concentrated form that the FDA has issued strong warnings about 
 
 Withdrawal symptoms 
 
 People with pre-existing heart conditions, as well as children and pregnant women, are advised to drink less caffeine -- but how much is too much varies significantly from person to person, according to Maggie Sweeney, a Johns Hopkins University researcher who studies caffeine. 
 
 "That's certainly an awful lot of caffeine," Sweeney said of the brew's 5 grams. "With much lower doses of caffeine you see the effects of caffeine intoxication. Depending on an individual's sensitivity and tolerance, you would expect they might experience some negative side effects upwards of 250 milligrams." 
 
 While differing levels of tolerance make it difficult to name a lethal dose, Sweeney said she believes "about 10 grams" could kill someone, twice the caffeine content of the Asskicker. 
 
 Sweeney's program works with people whose caffeine dependencies are interfering with their day to day life, most of whom consume "less than 1,000 milligrams a day." Symptoms can range from restlessness and insomnia to irregular heartbeat in severe cases. 
 
 "We've seen people who have missed work because of the severity of their caffeine withdrawal, people who have gotten into arguments with friends and family about their caffeine use," she said. 
 
 The researcher said she believes genetics play a role in the rate at which our bodies process the stimulant, a factor still being investigated. 
 
 "Caffeine isn't necessarily a bad thing; there's some evidence it can have health benefits, such as protection from Parkinson's disease," said Sweeney. "But for a subset of individuals -- and we're trying to determine exactly how many -- their dependence on caffeine has a negative impact." 
 
 A couple of cups a day 
 
 Other experts on the drug are convinced of its health benefits. Harvard Medical School's Dr. Sanjiv Chopra's book, " The Big 5 ," lists drinking coffee as one of five things you can do to live a longer and healthier life. 
 
 Join the conversation See the latest news and share your comments with CNN Health on Facebook and Twitter. 
 
 "People who drink coffee have a lower risk of five cancers: liver, prostate, colon, endometrial and skin cancer. It protects against cirrhosis (liver disease), Parkinson's, cognitive decline, Type II diabetes," said Chopra. 
 
 A 2012 study published in the New England Journal of Medicine found that men and women who drank more than three cups of coffee a day had a 10% lower risk of death from heart disease, respiratory illness, stroke, injuries or accidents, diabetes and infections. 
 
 But even the coffee evangelist believes the Asskicker is a dose too far. 
 
 "I would be very wary of consuming it," said Chopra. "That's a huge caffeine load." 
 
 "What I recommend is two to four cups [a day]. If you can drink them regularly it's better for the liver."
– One cafe owner in Adelaide, Australia, is playing around with the world's most popular drug, and experts aren't feeling terribly perky about it. Steve Benington, owner of Viscous Coffee, has created the Asskicker, a drink consisting of four shots of espresso, four 48-hour brewer cold drip ice cubes (each containing a bit more caffeine than is found in two shots of espresso), 120ml of 10-day brewed cold drip, and another four of those cold drip ice cubes to finish it off, reports Adelaide Now. All told, it has 5 grams of caffeine, about 80 times as a typical espresso, and it provides 18 hours of "sustained up time," as Benington puts it. "Some people love it and some are broken by it, but it’s all in the name of fun," he says. Benington developed the drink after an emergency room nurse asked for something that would get her through a long shift. It comes with a warning for people with heart or blood pressure issues, and he has "quite a detailed talk" with anyone who orders it because "if I can talk them out of it, they're not ready," he tells CNN. One area dietitian is not amused. "Caffeine is a drug, not a game or a toy," she says. The author of a book espousing the benefits of caffeine also chimes in that this drink goes too far. "I would be very wary of consuming it." Mashable notes that Benington does suggest people sip the drink over three to four hours to "lift you up and keep you there." It also notes that a fatal dose of caffeine is generally considered to be 18 grams over one or two hours. (There is such a thing as fatal caffeine intoxication.)