Around mid-century, Mendeleev began to develop the table of elements which helped in the discovery of new elements. In the last decade of the century, the discovery of radium by Marie and Pierre Curie, and the electron by Becquerel as well as observation of radioactivity in the laboratory, challenged Dalton's theory.
Medications Used to Treat ADHD. Stimulant medications commonly prescribed for attention deficit disorder include methylphenidate (Ritalin, Concerta, Metadate, Methylin) and certain amphetamines (Dexedrine, Dextrostat, Adderall). Methylphenidate is a short acting drug, and in older forms, had to be taken multiple times a day.
Knowing the differences between these medications may be helpful when developing a plan of action for ADHD treatment. Focalin Basics Focalin, or dexmethylphenidate, is a mild stimulant that is most commonly used to treat ADHD. It is similar to Ritalin in that it is a modified version of Ritalin, utilizing its most active component. Focalin was formulated for the purpose of providing those who need the convenience of a rapid onset ADHD drug with reduced side effects as compared to Ritalin.