Methylphenidate (MPH) is a prescription stimulant commonly used to treat Attention-deficit hyperactivity disorder, or ADHD, and Attention-deficit disorder, or ADD. It is also one of the primary drugs used to treat the daytime drowsiness symptoms of narcolepsy and chronic fatigue syndrome. The drug is seeing early use to treat cancer-related fatigue. Brand names of drugs that contain methylphenidate include instant release racemic methylphenidate Ritalin, Ritalina, Rilatine, Attenta (in Australia), Methylin, Penid, and Rubifen; and the sustained release tablets Concerta, Metadate CD, Methylin ER, Ritalin LA, and Ritalin-SR. Focalin is a preparation containing only dextro-methylphenidate, rather than the usual racemic dextro- and levo-methylphenidate mixture of other formulations.

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