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Wikipedia says…

Methylphenidate (MPH) is a prescription stimulant commonly used to treat Attention-deficit hyperactivity disorder, or ADHD. 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 Ritalin (Ritalina, Rilatine, Attenta, Methylin, Penid, 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. A newer way of taking methylphenidate is by using a transdermal patch (under the brand name Daytrana), similar to those used for hormone replacement therapy, nicotine release and pain relief (fentanyl).