Vivance 30mg given to child with sever autism and non verbal...

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Yesterday I started my 8 year old son on Vivance 15 of 30 MG. It worked beautifully from 9:00am - 1:00pm. Then he began fitting crying screaming putting his fingers in his ears as though they were ringing or he was hearing something that would come in waves and bring great pain and he was unconsolable. I thought the med had worn off at 1:00 and that was the cause. So today I gave the full 30 MG at 8:00am. The fitting we had yesterday we had today at a more intense level, and continues on still. At 4:30 I gave 2 charcoal pills and I called the Dr back and told him what was going on. He called him in a scrip of 2mg atavan. I gave that at 5:30pm. At 7:00 I gave his nighttime supplements 9mg melatonin l theamin and 25 MG benadryl. Its now 8:30 and he is still crying out and awake. Anyone know why or how to help him?