| 摘要 |
A composition for enhancing performance, e.g., improving subjective vigor, decreasing fatigue, diminishing subjective confusion, and decreasing tension and anxiety. The composition comprises an indirect-acting sympathomimetic drug and tyrosine or a tyrosine precursor. The drug may be phenylpropanolamine, amphetamine, or ephedrine. The tyrosine enhances the known performance-enhancing activity of the drug.
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