(NaturalNews) The Canadian government is requiring stricter warning labels on products containing acetaminophen, in the hopes of preventing lethal side effects stemming from consumers unwittingly taking too much of the dangerous over-the-counter drug.

Acetaminophen, the active ingredient in Tylenol, and is highly toxic to the liver. Acetaminophen overdose is the foremost cause of acute liver failure in both the United States and the United Kingdom, and is a major cause of liver transplants.

Studies have also shown that acetaminophen affects the brain's processing capability, leading to dulled emotions, lessened empathy and a reduced ability to notice errors.
 

High risk of accidental overdose

In the United States, an estimated 60,000 people per year are hospitalized for acetaminophen-related liver failure. According to a 2015 Health Canada safety review that led to the recent rule changes, the number in Canada is about 4,000. Of these, 250 involve serious liver injury.

About 20 percent of Canadians who experience serious liver injury as a result of acetaminophen took more than the recommended dose without realizing it. Many of these patients had factors placing them at risk of liver failure, such as alcoholism or viral liver disease.

Part of what makes acetaminophen so dangerous is that it can build up in the liver over time, producing a condition known as drug-induced hepatitis. In addition, it is found in so many different products -- from painkillers to cold medicine -- that people may not realize they are getting it from multiple sources at once.

"When it's in as many products as it is, and when people have a familiarity with the products, there may be less of a likelihood that somebody will actually read the label," said Dr. Supriya Sharma, senior medical adviser with Health Canada's health products and food branch.

Other ways people commonly overdose on acetaminophen include taking a second dose too soon after an initial dose, or taking more than the recommended amount.
 

Death by Tylenol

The new Canadian labels will revise dosage instructions to emphasize for consumers how important it is to use the lowest effective dose, not exceed the maximum dose (4,000 mg for adults) in 24 hours, not use acetaminophen for more than three days for fever or five days for pain, and not take acetaminophen if consuming three or more alcoholic beverages per day.

A label reading "contains acetaminophen" will be placed in bold, red letters in the top right corner of any products containing the drug.

All acetaminophen-containing products will contain a new table, called "Drug Facts," which will provide dosage instructions and safety information (a similar label is already found on over-the-counter medications sold in the United States).