Summary. Muscle aches is found among people who take Concerta, especially for people who are female, 40-49 old , have been taking the drug for 1 month, also take medication Xyrem, and have Multiple sclerosis. with others including acne and skin irritation, vivid dreams or nightmares, night sweats, body aches and cramps, muscle aches, dry mouth, fatigue, memory and cognitive problems, irritability, weight changes, hair loss, changes in libido, frequent urination, nausea, and so on and on. The Concerta ® tablet does not dissolve completely in the body after all the medicine has been released. You or your child may sometimes notice the empty tablet in a bowel movement. This is normal. You or your child may sometimes notice the empty tablet in a bowel movement. Find a comprehensive guide to possible side effects including common and rare side effects when taking Concerta (Methylphenidate Extended-Release Tablets) for healthcare professionals and consumers. Human Resources for the University of Oklahoma. Serving Faculty and Staff in Norman, Oklahoma City, and Tulsa campuses. Common side effects of Concerta include: insomnia, nausea, decreased appetite, and xerostomia. Other side effects include: anxiety, hyperhidrosis, and irritability. See below for a comprehensive list of adverse effects. Am prescribed 36mg concerta in the form of 2 18mg pills every day, however I only take 18mg normally because the 36mg give me the most insane headache, it's actually hard to function or do anything on it at all. Re: Concerta and stomach aches Almost any of the meds out there can cause stomach aches. The most important thing to do is make sure he eats a full meal before he takes his pill, or at least takes it while he is eating a good breakfast. It's a dextroamphetamine pro-drug, which means that it's completely intert entering the body, but your digestive system converts it into d-amphetamine. I find it a lot smoother than concerta in that there isn't really a noticeable comeup or comedown. The effects of Concerta on the body Concerta is a central nervous system stimulant. It is available by prescription and is often prescribed as part of a total treatment plan for ADHD.