revert back to his old behavior losing his temper today he was vacuuming and bag came off he threw bag then turned vacuum over said he was done with everything and went to bed. Its been about two weeks he has been like this he was taking 100mg daily I told dr. I am upping to 1/2 in am and same in the pm. He has dementia and is on the patch and namenda. Has anyone else had to deal with this and what dosage can he take without having a problem?