Bottom Line: There are many longer-acting methylphenidate preparations. Two good options are Concerta and Ritalin LA, both of which are now available generically. CONCERTA® was demonstrated to be effective in the treatment of Attention Deficit Hyperactivity Disorder (ADHD) in 4 randomized, double-blind, placebo-controlled studies in children and. Dextroamphetamine-Amphetamine Long-Acting (Adderall XR®) Methylphenidate Immediate Release (Ritalin®) CONCERTA is a CNS stimulant indicated for the treatment of attention deficit hyperactivity disorder (ADHD) in patients aged 6 to 65 years old. (1) BOTTOM LINE: There are many longer-acting methylphenidate preparations. Two good options are Concerta and Ritalin LA, available as generics. Dexmethylphenidate (DEX-meth-il-FEN-i-date) • Ritalin , Methylin (methylphenidate, immediate release) o Tablets: 5 mg, 10 mg, 20 mg o Chewable tablets: 2.5 mg, 5 mg, 10 mg o Liquid: 5 mg/5 mL, 10 mg/5 mL Drug Screening CONCERTA contains methylphenidate which may induce a false positive laboratory test for amphetamines, particularly with immunoassay screen test.