I have used Modivigil, which was wonderful, because, for the first time in years after a stroke, I was able to stay awake and alert, but, after 10 days of taking it twice a day (I do not know what strength it was), I gained 7 pound. I struggle with weight as it is, due to the neurological damage, so the extra weight was extremely unwelcome. Will Concerta also cause weight gain, despite that it says it causes weight loss?Weight gain was not listed as aside effect for the Modavigil.