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.
DrugFacts: Stimulant ADHD Medications: Methylphenidate and Amphetamines. Stimulant medications including amphetamines (e.g., Adderall) and methylphenidate (e.g., Ritalin and Concerta) are often prescribed to treat children, adolescents, or adults diagnosed with attention-deficit hyperactivity disorder (ADHD).oncerns have been raised that stimulants prescribed to treat a childâs or adolescentâs ADHD could affect an individualâs vulnerability to developing later drug problemsâeither by increasing the risk or by providing a degree of protection.