Methylphenidate is a drug which is similar to amphetamine. Its name is often shortened to MPH but is better known by the brand name of Ritalin or Concerta. MPH stimulates the central nervous system. It does this by increasing dopamine transmission in the brain.
The drug is commonly used to treat attention-deficit hyperactivity disorder and narcolepsy. It is sometimes used together with other drugs to treat depression. In most countries, its use needs to be prescribed by a doctor.