Johnson & Johnson (JNJ) said it will add a red warning to caps of Tylenol to reinforce the risks of taking too much of the painkiller. 
 
 The alert will appear on the caps of Extra Strength Tylenol beginning in October, New Brunswick, New Jersey-based J&J said today in an e-mail. The message will reinforce existing warnings that the over-the-counter pill contains the ingredient acetaminophen, which has been linked to fatal liver failure. Tylenol bottles already alert consumers to the liver risk. 
 
 Acetaminophen overdose is the most-common cause of liver failure in the U.S. The ingredient is found in more than 600 medicines, including generic non-prescription pain relievers and stronger combination products that require a doctor’s order, such as Vicodin. The Food and Drug Administration is reviewing appropriate acetaminophen levels for over-the-counter products, Andrea Fischer, a spokeswoman for the agency, said in an e-mail. 
 
 The FDA cut the amount of acetaminophen that prescription products could contain to 325 milligrams per pill two years ago and said recently it would require warnings on prescription products with the ingredient about rare serious skin reactions. 
 
 Extra Strength Tylenol tablets contain 500 milligrams of the ingredient, according to the website for the product. The new warning on Tylenol caps, first reported by the Associated Press, will read: “Contains Acetaminophen” and “Always Read the Label.” 
 
 J&J is the world’s largest maker of health-care products. Its sales of over-the-counter drugs, including Tylenol, and nutritional products accounted for about 6.5 percent of the company’s $67 billion in sales last year. 
 
 To contact the reporter on this story: Anna Edney in Washington at aedney@bloomberg.net 
 
 To contact the editor responsible for this story: Reg Gale at rgale5@bloomberg.net 

 Bottles of Tylenol sold in the U.S. will soon bear red warnings alerting users to the potentially fatal risks of taking too much of the popular pain reliever. The unusual step, disclosed by the company that makes Tylenol, comes amid a growing number of lawsuits and pressure from the federal government that could have widespread ramifications for a medicine taken by millions of people every day. 
 
 This undated product image provided by Johnson & Johnson shows a bottle of Extra Strength Tylenol bearing a new warning label on the cap alerting users to potentially fatal risks of taking too much of... (Associated Press) 
 
 Johnson & Johnson says the warning will appear on the cap of new bottles of Extra Strength Tylenol sold in the U.S. starting in October and on most other Tylenol bottles in coming months. The warning will make it explicitly clear that the over-the-counter drug contains acetaminophen, a pain-relieving ingredient that is the nation's leading cause of sudden liver failure. 
 
 "We're always looking for ways to better communicate information to patients and consumers," says Dr. Edwin Kuffner, vice president of McNeil Consumer Healthcare, the Johnson & Johnson unit that makes Tylenol. 
 
 Overdoses from acetaminophen send 55,000 to 80,000 people in the U.S. to the emergency room each year and kill at least 500, according to the Centers for Disease Control and Prevention and the Food and Drug Administration. Acetaminophen can be found in more than 600 over-the-counter and prescription products used by nearly one in four American adults every week, including household brands like Nyquil cold formula, Excedrin pain tablets and Sudafed sinus pills. 
 
 Tylenol is the first of these products to include such a warning label on the bottle cap. McNeil says the warning is a result of research into the misuse of Tylenol by consumers. The new cap message will read: "CONTAINS ACETAMINOPHEN" and "ALWAYS READ THE LABEL." 
 
 The move comes at a critical time for the company, which faces more than 85 personal injury lawsuits in federal court that blame Tylenol for liver injuries and deaths. At the same time, the Food and Drug Administration is drafting long-awaited safety proposals that could curtail the use of Tylenol and other acetaminophen products. 
 
 Much is at stake for McNeil and its parent company. Johnson & Johnson does not report sales of Tylenol, but total sales of all over-the-counter medicines containing acetaminophen were more than $1.75 billion last year, according to Information Resources Inc., a retail data service. 
 
 Safety experts are most concerned about "extra-strength" versions of Tylenol and other pain relievers with acetaminophen found in drugstores. A typical two-pill dose of Extra Strength Tylenol contains 1,000 milligrams of acetaminophen, compared with 650 milligrams for regular strength. Extra Strength Tylenol is so popular that some pharmacies don't even stock regular strength. 
 
 Most experts agree that acetaminophen is safe when used as directed, which generally means taking 4,000 milligrams, or eight pills of Extra Strength Tylenol or less, a day. 
 
 Each year, some 100 million Americans use acetaminophen, but liver damage occurs in only a fraction of 1 percent of users. Still, liver specialists say those cases are preventable. Part of the problem, they say, is that there are sometimes hundreds of pills in a bottle, making it easy for consumers to pop as many as they please. For example, McNeil sells Extra Strength Tylenol in bottles containing up to 325 tablets 
 
 "The argument goes that if you take acetaminophen correctly you will virtually never get into trouble," says Dr. William Lee of the UT Southwestern Medical Center, who has studied acetaminophen toxicity for four decades. "But it's the very fact that it's easily accessible over-the-counter in bottles of 300 pills or more that puts people in harm's way." 
 
 Lee applauded the new warning, but said McNeil's marketing has contributed to the "freewheeling" way that Americans take the drug. For decades, McNeil has advertised Tylenol as "the safest kind of pain reliever" when used as directed. "That has been their standard ploy in the past, and I would argue that safest it is not," he says. 
 
 McNeil's Kuffner stands by the company's safety claim: "When taken as directed, when people read and follow the label, I believe that Tylenol and the acetaminophen ingredient is one of the safest pain relievers on the market." 
 
 McNeil is the only major drugmaker adopting the bottle cap warning at this time, according to the Consumer Healthcare Products Association, a trade group for over-the-counter medicine companies. 
 
 "While this is not an industrywide initiative at this time, it fits squarely within the many ongoing industrywide educational initiatives to further acetaminophen safe and responsible use by consumers," said Emily Skor, a vice president with the trade group, which represents McNeil, Bayer Healthcare, Procter & Gamble and other nonprescription drugmakers. 
 
 20 YEARS OF WARNINGS 
 
 McNeil has updated the safety warnings on Tylenol periodically since the 1990s. 
 
 In 1994, the company added a warning about the risk of liver damage when combining alcohol with Tylenol following a lawsuit brought by Antonio Benedi, a former aide to President George H.W. Bush, who fell into a coma and underwent emergency liver transplant after mixing Tylenol with wine at dinner. 
 
 A jury awarded him $8.8 million in damages after concluding that McNeil failed to warn consumers about the risk. The FDA made the alcohol warning mandatory for all manufacturers of acetaminophen in 1998. 
 
 Then, in 2002, an expert panel of FDA advisers recommended that the government agency require all acetaminophen products to carry a warning about the risk of "severe liver damage" when not taken as directed. The group's votes are non-binding, though the FDA usually follows them. McNeil voluntarily added the warning to its products in 2004, five years before the FDA made it mandatory. 
 
 Today, McNeil appears to be moving ahead of regulators again. In 2009, the FDA assembled another expert panel to consider more sweeping changes to reduce acetaminophen overdoses. The panel recommended a half-dozen major changes, including lowering the maximum nonprescription daily dose for adults. McNeil voluntarily adopted that recommendation, lowering the recommended adult dose of Extra Strength Tylenol to 3,000 milligrams per day, or six pills of Extra Strength Tylenol, down from 4,000 milligrams per day, or eight pills. The label stipulates that patients can still take a higher dose under doctor's directions. 
 
 But the company has not embraced a more drastic recommendation by the FDA's expert panel: eliminating the over-the-counter "extra-strength" formulation altogether, which would mean lowering the acetaminophen dose from 1,000 milligrams to 650 milligrams, or two tablets of 325 milligrams each. The panel said the 1,000 milligram dose should only be available via prescription. 
 
 McNeil argues that the lower dose is less effective and could drive people to take anti-inflammatory pain relievers, a different class of drugs that includes aspirin and ibuprofen. Those medicines can cause stomach ulcers and dangerous gastrointestinal bleeding. 
 
 FDA spokeswoman Erica Jefferson says the agency is actively working on new rules for both children and adult acetaminophen products. While the agency won't give a timeframe for completion, the federal government's website that tracks new regulations lists December as the target date for publishing the proposed rules. 
 
 As early as 1977, FDA advisers recommended adding more warnings to the acetaminophen label about liver damage, but the agency didn't require the language until 2009. 
 
 "They are very slow to respond to these things and it's always a little frustrating," says Dr. Lewis Nelson of New York University, who chaired the 2009 FDA panel. 
 
 ANATOMY OF AN OVERDOSE 
 
 Experts first identified acetaminophen overdose as a major public health concern in the 1990s, but it has taken years to form a clearer picture of the problem. 
 
 Acetaminophen overdoses occur when the liver is overwhelmed by too much of the drug, producing a toxic byproduct that kills liver cells. Liver failure occurs when most cells are no longer able to function. At that point, a patient then generally has 24 to 48 hours to live without a transplant. 
 
 Of the roughly 500 acetaminophen deaths reported annually, about half are accidental, with the rest deemed suicides. About 60 percent of the unintentional overdoses involve prescription opioid-acetaminophen combination drugs such as Percocet and Vicodin, according to a database of liver failure cases run by Dr. Lee at the Southwestern Medical Center in Dallas. Those two products alone were prescribed more than 173 million times last year, according to IMS Health. 
 
 So how do these accidental acetaminophen deaths occur? Imagine you've had major dental surgery, and your dentist prescribes a five-day supply of Percocet. You take the recommended two pills every six hours for 2,600 milligrams of acetaminophen, well below the 4,000-milligram-a-day safety threshold. 
 
 But you're still experiencing pain, so you decide to add Extra Strength Tylenol, six caplets a day for another 3,000 milligrams. Now you're feeling better but you still have trouble sleeping, so you take Nyquil, for another 650 milligrams. After a few days on this 6,250 milligram regimen, experts say acute liver damage is a real risk. 
 
 The labels on all of these products warn against mixing them. But researchers say many consumers either don't read or don't understand such warnings. 
 
 Even after taking into account people who ignore labels, there are still cases of liver damage that stump researchers. These are the people who have apparently taken about 4,000 milligrams a day or less, well within the safety threshold. 
 
 "It's still a little bit of a puzzle," says Dr. Anne Larson, of the Swedish Medical Center in Seattle. "Is it genetic predisposition? Are they claiming they took the right amount, but they really took more? It's difficult to know." 
 
 The question is critical in the lawsuits piling up against McNeil in the Eastern District of Pennsylvania, near McNeil's headquarters in Fort Washington, Pa. Virtually all of the 85 cases claim that the plaintiffs suffered liver failure despite taking Tylenol as directed. 
 
 According to one of those complaints, Madeline Speal, of Salzburg, Pa., took Tylenol for three days in November 2009 "at appropriate times and in appropriate doses." But on Nov. 28, she was admitted to Latrobe Area Hospital with catastrophic liver damage. She was then transferred to the University of Pittsburgh Medical Center where she underwent an emergency liver transplant. 
 
 The cases against McNeil, which share the same legal wording, allege that the company risked the lives of consumers by making "conscious decisions not to redesign, re-label, warn or inform the unsuspecting consuming public." 
 
 The lawsuits have been consolidated under a single federal judge to streamline the pretrial process, though they will eventually be returned to judges in their original districts for trial. 
 
 J&J and McNeil continue to reiterate that Tylenol is safe. "We remain confident in the safety and efficacy of Tylenol products, which rightfully have been trusted by doctors, hospitals and consumers for more than 50 years," McNeil said in a statement. 
 
 But lawyers for the patients suing McNeil say Tylenol can still be dangerous even when used at or just above recommended levels. 
 
 "Products that are available to consumers should have a reasonable margin of safety," said Laurence Berman, one of several attorneys representing Tylenol users.
– Acetaminophen overdose is the top cause of liver failure in the US—and concerns about the widespread pain-relief ingredient have been growing. Starting in October, Johnson & Johnson subsidiary McNeil will stick a new warning on the caps of Extra Strength Tylenol, reading: "Contains acetaminophen. Always read the label," Bloomberg reports. (The label already outlines the liver risk.) Most other types of Tylenol will also soon be capped with the warning, the AP notes. Acetaminophen overdoses kill some 500 people a year and put 55,000 to 80,000 per year in the hospital, though of the 100 million Americans who take the ingredient each year, less than 1% suffer liver damage. The FDA is currently looking into how much acetaminophen should be allowed in over-the-counter drugs, a rep says. The ingredient is in some 600 products that a quarter of American adults use each week, the AP adds; Sudafed, Excedrin, Vicodin, and Nyquil are among them. But so far, McNeil, which is facing dozens of lawsuits, is the only major company adding the cap warning.