Inclusion Criteria:  1 - children (1-16) year's age with impaired left ventricular systolic function due to dilated cardiomyopathy, who attend pediatric cardiology unit 2-children attend to pediatric cardiology out patient clinic in Assiut university children hospital 3-children with no allergic reaction from allopurinol  Exclusion Criteria:  children with impaired left ventricular systolic function due to other causes like congenital heart diseases children with acquired heart diseases patients with allergic reaction or contra indicated from Allopurinol