A medication used to treat attention deficit hyperactivity disorder (ADHD) is being recalled for bottles containing tablets with a higher strength than labelled. The company, JAMP Pharma Corporation, found that some bottles of JAMP Guanfacine extended-release (XR) one-milligram tablets contained four-milligram tablets. One lot, or 100,000 units, is being recalled by the company, Health Canada said in a notice Thursday.