I don't know how's serious of yr children. If you think he is very serious, you can try to take pill. See the specialist first then you can take a small volume of pill first to see how's he adopts.
I understand quite lots of parents don't want to try this method but this maybe a good method for you and make sure the pill is less side effect for him now and future.
I understand what it is since my son is now trying to take it from a very small size up to 3/4. how many he took? Up to 3/4 I saw him a little bit 呆 but the teacher reported to me he is okay but the behaviour is more worst than before.