YES! My son has done the same stuff which was unusual behavior for him. I even tried it and OMG I couldn't believe how strange I felt and that was a child's dosage. I took him off it immediately and went to see an ENT/allergy specialist. He prescribed Zyrtec 10mg which is now available OTC in two child dosages, the 10mg and a lower one for younger children. Available at Costco. He also prescribed and eye drop for his eyes because his eyes bulge when his allergies are really bad.
Since going with the Zyrtec a year ago, we haven't had any behavioral issues.