Concerta is only available as an extended-release tablet. Adderall is available as an immediate-release and extended-release drug. In the immediate-release form, the tablet releases the drug into. Many think Concerta (methylphenidate) is safe, or mild, because so many children use it. However, the government classifies the psychoactive drug with cocaine and morphine because it is highly addictive. Knowing how long morphine remains in the system can help prevent an accidental overdose due to interactions or taking doses too close together. Clonidine hydrochloride extended-release tablets are indicated for the treatment of attention deficit hyperactivity disorder (ADHD) as monotherapy and as adjunctive therapy to stimulant medications [see Clinical Studies (14)]. DESCRIPTION. CONCERTA® is a central nervous system (CNS) stimulant. CONCERTA® is available in four tablet strengths. Each extended-release tablet for once-a-day oral administration contains 18, 27, 36, or 54 mg of methylphenidate HCl USP and is designed to have a 12-hour duration of effect. Concerta (methylphenidate extended release tablets) is a central nervous system stimulant used for treating attention deficit hyperactivity disorder. Side effects of Concerta include: Methylphenidate is used as part of a treatment program to control symptoms of attention deficit hyperactivity disorder (ADHD; more difficulty focusing, controlling actions, and remaining still or quiet than other people who are the same age) in adults and children. Modified-release dosage is a mechanism that (in contrast to immediate-release dosage) delivers a drug with a delay after its administration (delayed-release dosage) or for a prolonged period of time (extended-release [ER, XR, XL] dosage) or to a specific target in the body (targeted-release dosage). Concerta XL 18 mg prolonged-release tablets. - Summary of Product Characteristics (SmPC) by Janssen-Cilag Ltd WARNING: DRUG DEPENDENCE. Concerta ® should be given cautiously to patients with a history of drug dependence or alcoholism. Chronic abusive use can lead to marked tolerance and psychological dependence with varying degrees of abnormal behavior.