Some doctors are warning that long-term, daily use of a common aspirin substitute may triple the usual risk of kidney damage, but the maker of Tylenol disputed the finding.

"I don't want people to panic and say, `My kids shouldn't have Tylenol,' " said Dr. Saulo Klahr, president of the National Kidney Foundation. "But at the same time, it's important for people not to take this drug daily."Klahr said acetaminophen, the main ingredient in Tylenol, Anacin-3, Datril and other brands, may accumulate in the kidneys and cause chemical damage. A related painkiller, called phenacetin, was taken off the market six years ago because of concern about kidney damage and bladder cancer.