my 3 1/2 year old son has had problems with focusing, hyperactivi...

my 3 1/2 year old son has had problems with focusing, hyperactivity at times, decreased concentration and inability to complete tasks. He has trouble falling asleep at night. Had him evaluated for this. Pediatrician suggested that it could be the zyrtec, since symptoms started about a year ago. MD stated that 2 other mother's started their child on Singular and then stopped the Zyrtec and saw an improvement in child's concentration. Will see