"i am a 20 year old female and have been taking concerta on and off for five years. i was diagnosed with adhd during my freshman year of high school. concerta has worked wonders for me. i started high school getting ds and fs and left with as and bs. i would stop taking it every so often after lowering my dosage to see if i could manage without it but i would almost immediately lose my organization and more importantly my motivation. i did experience some side effects, including appetite loss and insomnia. these were easily cured by a dose modification. i am now the proud manager of a successful business."