<unk> , sold under the brand name Focalin among others, is a medication used to treat attention deficit hyperactivity disorder (ADHD) in those over the age of five years. If no benefit is seen after four weeks it is reasonable to discontinue its use. It is taken by mouth. The immediate release formulation lasts up to five hours while the extended release formulation lasts up to twelve hours. Common side effects include abdominal pain, loss of appetite, and fever. Serious side effects may include abuse, psychosis, sudden cardiac death, mania, anaphylaxis, seizures, and dangerously prolonged erection. Safety during pregnancy and breastfeeding is unclear.<unk>  is a central nervous system (CNS) stimulant. How it works in ADHD is unclear. It is the more active enantiomer of methylphenidate.<unk>  was approved for medical use in the United States in 2001. It is available as a generic medication. In 2019, it was the 131st most commonly prescribed medication in the United States, with more than 5million prescriptions. It is also available in Switzerland.
Dexmethylphenidate
Methylphenidate
Ethylphenidate
Atomoxetine
Guanfacine
Pirfenidone
Fluoxetine
Modafinil