November 29, 2005

Poisonings From a Popular Pain Reliever Are on the Rise

By DEBORAH FRANKLIN
http://www.nytimes.com/2005/11/29/health/29cons.html?incamp=article_popular

Despite more than a decade's worth of research showing that taking too
much of a popular pain reliever can ruin the liver, the number of
severe, unintentional poisonings from the drug is on the rise, a new
study reports. The drug, acetaminophen, is best known under the brand
name Tylenol. But many consumers don't realize that it is also found in
widely varying doses in several hundred common cold remedies and
combination pain relievers.

These compounds include Excedrin, Midol Teen Formula, Theraflu,
Alka-Seltzer Plus Cold Medicine, and NyQuil Cold and Flu, as well as
other over-the-counter drugs and many prescription narcotics, like
Vicodin and Percocet.

The authors of the study, which is appearing in the December issue of
Hepatology, say the combination of acetaminophen's quiet ubiquity in
over-the-counter remedies and its pairing with narcotics in potentially
addictive drugs like Vicodin and Percocet can make it too easy for some
patients to swallow much more than the maximum recommended dose
inadvertently.

"It's extremely frustrating to see people come into the hospital who
felt fine several days ago, but now need a new liver," said Dr. Tim
Davern, one of the authors and a gastroenterologist with the liver
transplant program of the University of California at San Francisco.
"Most had no idea that what they were taking could have that sort of
effect." The numbers of poisonings, however, are still tiny in
comparison with the millions of people who use over-the-counter and
prescription drugs with acetaminophen.

Dr. Davern and a team of colleagues from other centers led by Dr. Anne
Larson at the University of Washington Medical Center in Seattle,
tracked the 662 consecutive patients who showed up with acute liver
failure at 23 transplant centers across the United States from 1998 to 2003.

Acetaminophen poisoning was to blame in nearly half the patients, the
scientists found. The proportion of cases linked to the drug rose to 51
percent in 2003 from 28 percent in 1998. Not all the poisonings were
accidental. An estimated 44 percent were suicide attempts by people who
swallowed fistfuls of pills. "It's a grisly way to die," Dr. Davern
said, adding that patients who survive sometimes suffer profound brain
damage.

But in at least another 48 percent of the cases studied, the liver
failed after a smaller, unintentional assault by the drug over several
days. "I see some young women who have been suffering flulike symptoms
for the better part of a week, and not eating much," Dr. Davern said.
"They start with Tylenol, and maybe add an over-the-counter flu medicine
on top of that, and pretty soon they've been taking maybe six grams of
acetaminophen a day for a number of days. In rare cases that can be
enough to throw them into liver failure."

Each Extra Strength Tylenol tablet contains half a gram, or 500
milligrams, of acetaminophen, and arthritis-strength versions of the
pain reliever contain 650 milligrams. One tablet of Midol Teen formula
contains 500 milligrams of acetaminophen, as does one adult dose of
NyQuil Cold and Flu. One dose of Tylenol Cold and Flu Severe contains
1,000 milligrams. The recommended maximum daily dose for adults is 4
grams, or 4,000 milligrams.

"Part of the problem is that the labeling on many of these drugs is
still crummy," said Dr. William Lee, a liver specialist at the
University of Texas Southwestern Medical Center in Dallas, who for years
has been lobbying the Food and Drug Administration to make manufacturers
put "acetaminophen" in large letters on the front of any package that
contains it, so that as they reach for the bottle, patients will be more
likely to pause and keep track of exactly how much they are swallowing.

Some companies have voluntarily added new warnings about acetaminophen's
risk to the liver, and they should be given credit for that, said Dr.
Charles Ganley, director of the F.D.A.'s Office of Nonprescription
Products. "But labeling isn't where I would like it to be," Dr. Ganley
added.

McNeil Consumer & Specialty Pharmaceuticals, a division of Johnson &
Johnson, updated the labeling on all its Tylenol products in 2002 to
list all the active ingredients on the front of the bottle, increase the
type size of acetaminophen, and added a label on the front warning
consumers not to use the product with others that contain acetaminophen,
said Kathy Fallon a spokeswoman.

"I urge consumers to read the label," she said. "Anything more than the
recommended dose is an overdose."

Dr. Lee said he was disturbed by a pattern: "that acetaminophen is
always billed as the one to reach to for safety, probably even more so
now, with other pain relievers pulled from the market."

In fact, the drug, when given in precise, appropriate doses is safer for
children and teenagers than aspirin, which can interact with a viral
infection to bring on rare but serious damage to the brain, liver and
other organs in a constellation of symptoms known as Reye's syndrome.
And among adults, low doses of acetaminophen are less likely than
aspirin, ibuprofen or naproxen to eat away at the stomach, aggravate
bleeding or harm the kidneys.

Even patients with chronic liver disease are justly advised to take
acetaminophen for the occasional fever, or for the pain of
osteoarthritis, a back injury or other malady, if they keep the total
daily dose under about two grams, Dr. Lee said.

Experts agree that a vast majority of people can safely take the
four-gram daily maximum that labels recommend for adults - the
equivalent of eight Extra Strength Tylenol spread across 24 hours - and
some people swallow much more without harm.

But by eight grams in a single day, a significant number of people whose
livers have been stressed by a virus, medication, alcohol or other
factors would run into serious trouble, Dr. Lee said. Without
intervention, about half the people who swallowed a single dose of 12 to
15 grams could die.

How much alcohol over what time period is problematic? Recent research
suggests the answer isn't simple. The package labels now warn anyone who
drinks three or more drinks every day to consult a doctor before taking
acetaminophen, but Dr. Lee thinks that people who are sober during the
week but binge on weekends may be vulnerable, too.

The few days of fasting that can accompany a bad stomach bug also seem
to increase the liver's vulnerability to acetaminophen. And though safe
levels of the drug for large men may, in general, be higher than those
for small women, obese people aren't protected; extra fat in the liver
seems to prime the organ for further damage.

Nearly two-thirds of the people in the transplant center study who
unintentionally poisoned themselves were taking one or another of the
roughly 200 prescription drugs that contain acetaminophen plus an
opiate. Among the most popularly prescribed drugs in this group include
hydroconebitartrate plus acetaminophen, which is commonly sold as
Vicodin, and oxycodone hydrochloride plus acetaminophen, better known as
Percocet.

While these acetaminophen/opiate combination drugs can be very effective
in curbing pain after surgery or injury, some patients who take the
drugs chronically soon find they need increasing amounts to achieve the
same level of pain relief.

Because the narcotic part of the compound can be addictive, its
accompanying doses of acetaminophen climb sky high in lock step. The
liver may keep pace with gradual increases of the drug initially, only
to suddenly crash months later. It is the acetaminophen that kills the
liver.

Lynne Gong of San Jose, Calif., watched her 28-year-old daughter, Leah,
nearly die last summer after that sort of crash. What had started out as
a treatment for the pain of a dislocated shoulder and subsequent surgery
had escalated over two years to a full-blown addiction.

After her daughter was hospitalized, Ms. Gong said she found herself
warning friends, neighbors "and anyone else who would listen" that they
needed to closely monitor their own intake of acetaminophen and that of
their children.

Some dangers lurk in surprising corners. One day, after Lynne Gong told
the women in her prayer group about Leah's experience, a member went
home and, after a little investigating of her own, discovered that her
12-year-old son and his friends had started nipping NyQuil on Friday
nights for the alcohol content, in hopes of getting drunk.

There are 9.8 grams of acetaminophen in a 10-ounce bottle of NyQuil, Ms.
Gong said. "Everyone really needs to be more aware."

    * Copyright 2005 The New York Times Company