Combination drugs for hepatitis C have been recommended by the National Institute for Clinical Excellence. NICE said that patients suffering from moderate or severe hepatitis C should be given a combination of the drugs interferon alpha and ribavirin. Until June 1999, interferon alpha was the only licensed treatment for chronic hepatitis C. Welcoming the recommendation, health minister John Denham said research had shown that using the two drugs together doubled the chance of recovery for patients. NICE also put out guidance recommending the use of Ritalin (methylphenidate) for children suffering from attention deficit/hyperactivity disorder. But NICE said the drug should only be prescribed after a full assessment by an expert in the field, that the child and parents should be involved, and that treatment should be regularly monitored and periodically stopped to assess the child's process.