| http://www.w3.org/ns/prov#value | - U.S. Pat. Nos. 5,874,090 and 5,837,284 describe sustained release formulations of methylphenidate. [0005] In addition to their important medical uses, central nervous system stimulants are employed commonly, by such means as inhalation and intravenously, for illicit purposes, including emotional, psychological, euphoric, hallucinogenic, and psychedelic experiences.
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