Drug-safety Experts And Top FDA Officials Disagree About Increased Heart Risks Associated With Stimulants
On February 9-10, 2006 the FDA convened an advisory panel committee of outside drug-safety experts to consider the issue of how best to study the potential cardiac risks of Adderall, Ritalin, and other stimulants. This advisory panel committee, however, went beyond their assigned mission and recommended that a "black-box" warning be put on Adderall, Ritalin, and other drugs used to treat attention deficit hyperactivity disorder (hereafter, "ADHD/ADD drugs").
This FDA advisory panel committee apparently wanted patients and their parents to know now what is going on with the ADHD/ADD drug issue, recommending this black-box warning be added to the labels while the manufacturers are investigating whether their drugs increase one's risk of having a heart attack or stroke.
A day before this panel met the FDA disclosed findings from its review of several ADHD/ADD drugs; from 1999 to 2003 there were 81 deaths and 54 non-fatal cardiovascular events, like heart attacks and strokes, reported to the FDA MedWatch program which were possibly linked to the ADHD/ADD drugs. These adverse event reports made to the FDA included incidents involving Shire Pharmaceuticals PLC's Adderall, Johnson & Johnson's Concerta, Novartis AG's Ritalin, and some similar generic drugs.
In a memo to advisory panel committee members from Gerald Dal Pan, the FDA's director of the Office of Drug Safety, it was pointed out that the MedWatch reports of deaths and other cardiovascular events associated with Adderall and other ADHD/ADD drugs "do not establish a causal link between the medications" and the events because the sudden cardiac death, or heart attack, or stroke, could have occurred for another reason.
According to a February 8, 2006 article published by Reuters, Adderall was involved in more fatal case reports than any other ADHD/ADD drug.
"Through 2003, 24 deaths were reported from 1999 through 2003 among U.S. patients who took Adderall for ADHD.... Another 16 deaths were reported through 2003 in U.S. patients who took Ritalin or other ADHD drugs known as methylphenidates, the report said. Eleven deaths were reported among other drugs besides Adderall in the amphetamine class, it said."
The degree of disagreement between drug-safety experts and top FDA officials about increased heart risks associated with these stimulants is made clear by Gardiner Harris in his February 10, 2006 New York Times article concerning the outcome of this advisory panel committee meeting: (free registration required)
- "The committee's action was unexpected. The Food and Drug Administration had convened the panel to help it determine how to research possible heart risks of the drugs. The agency had not asked the committee to address the drugs' labels, and agency officials seemed taken aback by the votes, saying they would not act on the committee's recommendations anytime soon."
- "'We don't think anything different needs to be done right now,' Dr. Thomas Laughren, director of the Division of Psychiatry Products at the agency, said at a hastily arranged news conference after the meeting. 'We think the labeling right now is adequate.'"
- "Dr. Andrew Mosholder, also a medical officer in the Office of Drug Safety, said he reviewed the chemical structures of stimulants, and he noted that these structures were similar to drugs like ephedrine that had proven heart risks."
- "Arthur A. Levin, director of the Center for Medical Consumers in New York City and member of advisory panel... 'For us to sit around and talk about it, and for us to not make a very strong warning about the uncertainty of these drugs and their possible risks, would be unethical,' Mr. Levin said."
- "Dr. Thomas R. Fleming, a professor of biostatistics at the University of Washington and a panel member, said stimulants might be far more dangerous to the heart than Vioxx or Bextra, drugs that were withdrawn over the past two years because of their ill effects on the heart."
Health Canada temporarily suspended Adderall sales last year after 20 reports of sudden death in people who took it. The agency allowed Adderall back on the market after Health Canada concluded that it could not prove that Addrerall was more risky than other ADHD/ADD drugs.
ADHD is a neurological disorder in which people have difficulty concentrating or staying on a task to the extent that it causes impairment in academic, work, or social settings. Up to 7% of U.S. school-age children are believed to have ADHD. The disorder is often referred to as attention deficit disorder, or ADD, in adults.
During 1999 to 2003 (same five-year time frame as FDA's review), about 78 million prescriptions were written for ADHD/ADD drugs in children ages one to 18, and more than 14 million ADHD/ADD drug prescriptions were written for adults.
(Posted by: Tom Lamb)