The regular surveys conducted by McNeil show that while most doctors recommended the drug, they also told patients to take the medication at doses far less than the daily maximum allowed by the federal government, according to the previously undisclosed documents.
The reason? Doctors worried that what the government and company described as the maximum safe dose of the active ingredient in Tylenol, a compound called acetaminophen, was too close to the level that can damage the liver and even lead to death.
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