Infantile Spasms or not. Is wrong?

My 9 months old son started showing some weird expressions which looked like Infantile Spasms. Initially we thought he is just expressing anger or stress. But, it became more frequent and without any trigger. He seemed to be doing it without his control. But he doesn't cry or show any pain. He just tightens his jaws and hands for a few seconds.  Worrying about this we took some videos and visited a prominent Pediatric Neurologist. He checked out the video and enquired a few things and clarified that this is nothing to worry about. Though, It was a big relief, I am still concerned a bit. When I asked, he clarified EEG test or any other tests are not needed to verify his diagnosis.  He mentioned, this is some kind of "behaviourism". Perhaps, he didn't tell me the exact technical term for this condition. He prescribed neurocetam piracetam syrup for 2 months. Is it still needed if nothing is wrong? I am not comfortable with feeding the baby unnecessary drugs. Please advise.