What are the similarities and differences between adderall / metadate / ritalin (methylphenidate) / concerta?

MPH vs DA, Timing: Those medications differ in two major ways. First, whether they are a methylphenidate (mph) base like ritalin, metadate, or concerta, or whether they are Dextroamphetamine based like adderall (dextroamphetamine and racemic amphetamine). Individual benefits and side effect profiles are based largely on this distinction. The second difference is in timeframe as all these medications can operate in the body in differing timecourses.

Two molecules: Ritalin, metadate, and Concerta are different delivery systems of the stimulant methylphenidate. They differ in onset, peak, and duration of action. Adderall (dextroamphetamine and racemic amphetamine) is a different stimulant, amphetamine. Both molecules are effective in treating adhd.