Increases in stress and noise are typical triggers for poor concentration - even in people without ADHD. Concerta can help balance the neurotransmitters in your brain and a higher dose may well be required; remember that the optimum dose is different for everyone and finding it can take some time. Did the mistakes cause anxiety prior to starting Concerta? Anxiety is a known side effect of Concerta or may be exacerbated by it; these side effects often pass shortly. It would be beneficial to discuss the anxiety with you psychiatrist; try to note which situations bring it on, the people you are with, if it is only work related or in social settings as well etc. The more information you can provide him/her, the more s/he will be able to determine the best course of action. Paying closer attention to your diet and exercise regime as Eric suggested are very good tips as your body influences your mind as much as your mind influences your body. It may also be beneficial to look into some relaxation techniques to implement when you are beginning to feel anxious. Taking short breaks to move around can also help you to refocus your attention.
All the best,
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