Common Side Effects. Dizziness; drowsiness; dry mouth; headache; increased sweating; loss of appetite; nausea; nervousness; stomach pain; trouble sleeping; weight loss.
Dangerous. Never take more than your prescribed dose of concerta, or any other medication. Higher doses of Concerta can have serious cardiovascular side effects. Bllod pressure and pulse rate could elevate and be dangerous. If you or someone you know may have overdosed on concerta, seek immediate medical attention.