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adhd - Drugs for ADHD
Canada Regulators Order adderall Withdrawn
TORONTO (AP 2/9/05) - Canadian regulators ordered a daily treatment drug for attention deficit hyperactivity disorder off the market late Wednesday after learning the drug has been linked to 20 sudden deaths and a dozen strokes, including some among children.
Additionally, makers of related stimulants used to treat the commonly diagnosed condition have been asked to provide a thorough review of their worldwide safety data, Health Canada said in a release late Wednesday. None of the deaths or strokes associated with adderall XR were reported in Canada, department spokesman Ryan Baker said. "However, Health Canada has received eight reports of adverse reactions ranging in severity from convulsions to minor skin rash," Baker said. "It's not been determined yet whether these reactions were a result of Adderall XR use."
Of the 20 cases of sudden death linked to the drug, 14 were in children. Two of the 12 strokes were suffered by children taking the drug. The adverse reactions were not associated with overdose, misuse or abuse of the drug, the department said.
The drug is made by Shire Pharmaceuticals Group PLC, based in Basingstoke, England, and is sold in Canada and the United States. A related immediate-release form of the drug, sold simply as Adderall, is sold in the United States but has not been approved for sale in Canada, where 11,000 patients are prescribed Adderall XR. Canadian officials approved that drug in January 2004.
Shire's chief executive, Matthew Emmens, said in a statement late Wednesday that the company "remains confident in the safety and efficacy" of the drug. Emmens said the U.S. Food and Drug Administration had reviewed the same data as Health Canada last year and sought an additional warning in September that the drug should not be prescribed for people with "structural cardiovascular abnormalities."
About 700,000 people take Adderall XR in the United States, with about 300,000 more using Adderall, Shire spokesman Matthew Cabrey said Wednesday. Shire reported $140 million in U.S. sales of the drugs in the third quarter of 2004.
The incidence of serious adverse reactions leading to death was higher in Adderall and Adderall XR combined than in any other drugs of this class, the release said. ADHD is the most commonly diagnosed psychiatric disorder among school-aged children.
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