It is my opinion that Strattera does in fact effect growth. My 12 year old son went from being the tallest in his class to only growing 1 inch in a two year time span. He is considerably smaller than his classmates. When the doctor looked at his growth pattern, he said it looked as if he had been malnourished because that's usually the only reason for growth to take such a dramatic turn. My son eats very well. I have now taken him off of strattera and am considering Concerta.