Although most of these side effects are mild or will dissipate as the body gets used to the medication, but any persistent or particularly bothersome symptoms may be a sign of a more serious medical condition and should be reported to a doctor. When people without ADHD abuse it, Concerta can have dangerous side effects and can lead to prescription drug addiction. How Abusing Concerta Can Cause Addiction Concerta is usually abused by individuals who want to feel more alert or focused. 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. Our Concerta Side Effects Drug Center provides a comprehensive view of available drug information on the potential side effects when taking this medication. This is not a complete list of side effects and others may occur. An overdose of Concerta, accidental or otherwise, can cause psychological effects that can be extreme. Some experience a sense of agitation or confusion; others can experience the opposite in the form of an inappropriate state of happiness, according to the NIH and the National Library of Medicine website MedlinePlus. Find information about common, infrequent and rare side effects of Concerta Oral. According to the prescribing information, feeling weak, run down and extremely lethargic are not reported side effects associated with Concerta treatment. Some of the most commonly reported side. Instead, methylphenidate is routinely portrayed as a benign, mild substance that is not associated with abuse or serious side effects. In reality, however, the scientific literature indicates that methylphenidate (Concerta) shares the same abuse potential as other Schedule II stimulants. Find patient medical information for Concerta Oral on WebMD including its uses, side effects and safety, interactions, pictures, warnings and user ratings. Concerta is used to treat attention deficit disorder (ADD) and attention deficit hyperactivity disorder (ADHD). Learn about side effects, interactions and indications. Learn about side effects, interactions and indications.