It depends on the person's metabolism! My son who is now 14 and 115 lbs has been taking Ritalin for years. As he has grown, he has needed a higher and more frequent dose due to his high metabolism. Concerta 54 mg long lasting is supposed to last 12 hrs. It lasts about 4 to 5 hrs for my son. He has to take a 10mg Ritalin in the afternoon to get through the school day.
I take 36mg of concerta in the morning, and it has an effect for about 8-10 hours, and I have a relatively fast metabolism. However, people who take concerta gradually build up a tolerance for the drug, and over time it becomes less effective. I feel the drug's impact on my body, but it isn't nearly so strong as it was 5 years ago. ^^ I would advise that you look into other ways to address your child's ADD/ADHD such as behavioral therapy or a different school setting that is better suited to his/her way of learning. I started on concerta when I was 18 for my ADD, and it changed me forever...sure, it helped me concentrate and my marks improved...but it wasn't worth it at all. Besides the psychological dependance that I now have, I also suffer from side effects, some of which are actually dangerous...I developed anorexia pretty much directly after I started taking it (which I have thankfully been able to overcome, for the most part) and I now have recurring heart palpitations and generalized anxiety, and a day without the drug is hell...all of my symptoms come back much stronger, and I feel so tired and depressed it's hard to get out of bed. It might be legal, but it's basically prescription speed...sorry for the earful, but it makes me really sad when I hear about children being prescribed this drug.
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