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Misuse of pain drug linked to hearing loss
A powerful and potentially addictive painkiller used by millions of Americans is causing rapid hearing loss, even deafness, in some patients who are misusing the drug, according to hearing researchers in Los Angeles and elsewhere.
So far, at least 48 patients have been identified by doctors at the House Ear Institute in Los Angeles and several other medical centers who have treated patients with sudden hearing loss. The hearing problems appear to be limited to people who abuse Vicodin and other chemically comparable prescription drugs by taking exceptionally high dosages for several months or more, doctors said.
Vicodin, one of the most commonly prescribed painkillers, is frequently used improperly.
"This has become such a popular drug of abuse," says Dr. John W. House, president of the House Institute in Los Angeles, one of the nation's leading centers of hearing-related research.
Actress Melanie Griffith and Cindy McCain, wife of Sen. John McCain, have acknowledged their struggles to overcome Vicodin addiction, which they both were prescribed for severe back pain.
But it's not just notables who are getting hooked.
Christina Jaeger of Los Angeles was prescribed Vicodin in 1993 after a back injury. Gradually, she got addicted. She would wean herself off Vicodin for brief periods, only to relapse when doctors continued to prescribe the drug for her recurring pain.
Then, earlier this year, the 36-year-old model and fitness trainer suddenly began to lose her hearing. When her doctors couldn't explain what was happening, she went to the House Institute, where specialists concluded that Vicodin was to blame. Jaeger immediately entered a treatment program to kick her Vicodin habit. But it was too late. By the time she completed the program, she was deaf.
"If I had only known, I would have tried anything to stop," Jaeger said. "The lack of information is what I'm most furious about. That, and the proclivity of doctors to write prescriptions for Vicodin like it's candy."
Some experts believe that doctors' willingness to liberally prescribe potent narcotic painkillers may be contributing to the rise in abuse.
Vicodin, a synthetic opiate that is a chemical cousin of heroin and morphine, has long been known to doctors as a potentially addictive medication. "As soon as Vicodin hit the market, there was a steady stream of addicts," said Dr. Drew Pinsky, medical director for the chemical dependency program at Las Encinas Hospital in Pasadena, Calif. "It's such a huge problem already that I don't know how much bigger it could be."
Researchers at the House Institute were among the first to connect Vicodin use with sudden hearing loss. They now have identified 29 people who heavily abused the painkiller and who subsequently suffered a sudden hearing loss; 16 of those were diagnosed in the last two years. UCLA scientists said they have seen an additional 14 patients with opiate-inducing hearing loss, mostly from overuse of Vicodin, and other ear experts around the country report seeing at least five more of these cases.
Dr. Richard Wiet, a professor of otology at Northwestern University, said he began noticing cases of hearing loss tied to Vicodin use after learning of the findings of House Institute researchers. "Then I started watching for it and found two patients. There's definitely something to this."
But researchers at a dozen other medical institutions said they were unaware of similar cases. "It's an interesting observation, but there's really no way to prove as yet that Vicodin caused this problem," said Dr. Steven D. Rauch, an associate professor of otolaryngology at Harvard Medical School in Cambridge, Mass.
Doctors at the House Institute reported the hearing loss incidents to the Food and Drug Administration in 1999, and then again in August. Last year, Knoll Pharmaceutical Co., the firm that makes Vicodin, added a warning about the potential for hearing loss to the drug's label. But the label change appears to have gone largely unnoticed, even among some top hearing specialists. Knoll is now owned by Abbott Laboratories.
Susan Cruzan, an FDA spokeswoman in Rockville, Md., said the agency worked with the manufacturer on the wording of the label. No further action is planned, Cruzan said, because the FDA considers the hearing loss problem to be "a very rare side effect that is associated with using the drug in an inappropriate manner."
The 48 cases identified so far may seem small considering that 36 million prescriptions for Vicodin-type products were written in 2000, according to IMS Health, a health information company in Westport, Conn. (Vicodin is a combination of acetaminophen and hydrocodone and is also sold under the brand names Lorcet, Lortab and Hydrocet.)
But the hearing loss problem may be "much more prevalent than we think," said Dr. Akira Ishiyama, an assistant professor of otolaryngology at UCLA Medical School who has treated nearly a dozen cases. Some doctors, he said, may not have drawn a connection between Vicodin use and sudden hearing loss in patients because they "haven't been looking for it."
When doctors see isolated cases of sudden hearing loss, they may believe it's just a chance occurrence. At the same time, patients may not realize -- or admit -- their addiction to painkillers. Vicodin is typically prescribed for short-term use of two to three weeks at most, with patients taking one pill every six hours. But many of the patients who have suffered hearing loss were taking 20 pills or more a day for at least two months, doctors said.
"This seems to be a relatively new phenomenon," House said. "Because we see thousands of hearing impaired patients a year, we can spot trends faster than the average ear, nose and throat doctor."
The House Institute pioneered the development of cochlear implants, which are tiny electronic devices that aid in processing sounds for people who are deaf. Consequently, the research center sees a high number of people with sudden hearing loss.
After seeing its first case of Vicodin-attributed hearing loss in 1993, the House Institute began seeing patients with the same symptoms.
All admitted abusing drugs containing the hydrocodone-acetaminophen mix. Researchers began tracking these cases and, in April 1999 -- after identifying 13 patients -- shared their findings with hearing specialists at a professional meeting in Palm Springs, Calif. At the time, House scientists considered the handful of cases an anomaly. Soon, however, 16 more people showed up with the same problem.
Hearing researchers are still trying to find out how these painkillers cause deafness. They know the delicate hair cells inside the inner ear are permanently damaged in people with opiate-induced hearing loss. These hair cells are like tiny microphones, picking up sound vibrations and transforming them into nerve impulses that are transmitted to the brain. Once they're destroyed, people lose the ability to sense sounds.
Researchers also suspect that the inner ear contains opioid receptors, or nerve endings that are highly sensitive to stimulation by drugs in the morphine, heroin or hydrocodone families. They believe that there is a connection between these two phenomena. "But we're still unclear as to the exact mechanism of damage," said Dr. Robert W. Baloh, a professor of neurology and head and neck surgery at UCLA Medical School.
It's unclear whether the damage can be reversed once patients start experiencing symptoms. "Some patients have retained some hearing if they stop using the painkillers immediately," House said. "But for most, the damage is already done. Once the process starts, it seems irreversible."