I definitely feel 'stupid' since I started medication. I have been dumbed down by ten or more IQ points. Of this I am certain. I get word dumb - which is humiliating. In addition though what were once simple cognitive tasks for me have become difficult. Math is an example. Frankly anything that requires problem solving or critical thinking takes a great deal of effort. I followed someone else's suggestion of doing puzzles in an effort to try and improve things. It isn't working very well.