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The drug in question is called topiramate (Topamax). It's an established migraine drug for adults that was just approved for use in teens in 2014. Appetite reduction and weight loss are common side effects of the drug, according to the report authors.
"For most kids, it's a great medicine, but for a handful of kids the weight loss can trigger symptoms of an eating disorder," said report author Jocelyn Lebow, a child and adolescent psychologist for the eating disorders treatment program at the University of Miami Miller School of Medicine.
It's important to note that the report only showed an association between taking the drug and eating disorders; it did not prove the drug can actually cause an eating disorder.
The report was published online April 6 in the journal Pediatrics.
The report details the case histories of seven young women, aged 13 to 18. The teens developed an eating disorder or had an existing disorder worsen after starting the drug.
Lebow emphasized that the report is not a study, but information on seven case histories. "This isn't a prevalence study," she said. "These are kids who presented to an eating disorders program."
What the report suggests, she said, is that there are some teens who are especially vulnerable to eating disorders and the drug may increase that risk.
Three of the patients didn't have eating disorder symptoms before starting the drug. Another three said they suspected the eating disorder began before they started the medication. The seventh had an eating disorder that was in remission, but it recurred after starting the drug, the researchers reported.
Four of the teens were diagnosed with an unspecified eating disorder. One teen had bulimia nervosa, which involves binging on food then purging by throwing up or using laxatives. And, the final two were diagnosed with anorexia nervosa -- a disorder that causes people to excessively restrict food and leads to extreme, potentially dangerous weight loss.
Lebow said she can't say how the drug may trigger the eating disorder, although "we know in any person the weight loss itself can be the trigger for an eating disorder," she said.
A spokesman for Janssen Pharmaceuticals Inc., which makes and sells topiramate, said the Titusville, N.J.-based company will weigh the findings carefully.
"We are reviewing the article, our database and the medical literature, and will report any findings to the FDA [U.S. Food and Drug Administration] as appropriate," Greg Panico, communications leader of neuroscience at Janssen Research & Development, said in a statement.
The link between the migraine medicine and eating disorders is not new, said Dr. Russell Marx, associate medical director at the Eating Recovery Center in Denver and chief science officer at the National Eating Disorders Association. "We see this all the time, that topiramate can trigger an eating disorder, both in adults and teens," he said.
However, another expert noted that the report isn't definitive.
It "does not definitively prove that topiramate can cause eating disorders," said Dr. Douglas Klamp, an expert in treating eating disorders in Scranton, Pa. To do that, he said, a large study would have to be done that followed those with migraines on and off the drug to see who developed eating disorders.
However, he said, he is "reasonably convinced" by the report that the drug can lead to eating disorders. "The mechanism of action of the drug affects brain chemistry in a way that could likely lead to an eating disorder," he explained.
Klamp said he would be reluctant to use the drug in teens at risk for eating disorders. "For adolescents with a history of anorexia, it seems like topiramate simply should not be used," he said.
If teens use topiramate for migraines, parents should be aware of warning signs of eating disorders, the experts agreed.
"If you see some pervasive symptoms, like a lot of weight loss, don't dismiss it," Lebow said. Another warning sign is a change in normal behavior, such as an outgoing teen suddenly isolating herself and not engaging in activities with friends, she said.
The report authors also suggested that doctors screen teen migraine patients for eating disorders and risk factors for eating disorders before prescribing topiramate. In addition, weight should be monitored carefully when someone first starts taking the drug, they suggested.
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