A 2-[(diphenylmethyl)sulfinyl]acetamide that has S configuration at the sulfur atom. The racemate comprising (S)-modafinil and its enantiomer, armodafinil, is known as modafinil and is used for the treatment of sleeping disorders such as narcolepsy, obstructive sleep apnoea, and shift-work sleep disorder. The enantiomers have similar pharmacological actions in animals.
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A phsychotropic drug that improves wakefulness and alertness, and reduces tiredness, drowsiness, and the need for sleep. Eugeroics are relatively non-addictive and are used in the treatment of narcolepsy and other sleep disorders.