Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Did not work

My 4 year old son is very active, so thought I'd give this a try. This did not work, so I tried 1.5 dosage because another customer said she tried to increase the dose. Big mistake! He had a really bad reaction to this. His eyes glazed over like he was high on drugs(looked like he had gel-like tears in his eyes that would not fall), and he was screaming that he had a headache while walking around holding his head. An increase of such a small amount should not have had that effect. Parents if you try this, do not try to increase the dosage under any circumstances.