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.
A minimum of 80 percent of children with ADHD respond positively to at least one of the stimulant ADHD medications available, according to the American Academy of Pediatrics (AAP). Stimulant ADHD medicines are the most frequently prescribed treatments for ADHD kids.Physicians frequently try multiple ADD medications to find the one that offers the best relief of ADHD symptoms with the least undesirable side effects.mphetamine-based ADHD medicines include those sold under the brand names Adderall, Dextrostat, Dexedrine, and Vyvanse. The most common side effects associated with stimulant ADD medications include: 1  Insomnia. 2  anorexia (decreased appetite).