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Cough Syrup. Specifically, Dextromethorphan (DXM) based cough syrup. A moderate dose will increase stamina and concentration. The magic number is somewhere between 60-150mg. Above that is counterproductive as the dissociative/hallucinogenic properties begin to kick in.

Be very careful when selecting the syrup. Check the ingredients list thoroughly, you're looking for an active ingredient of Dextromethorphan Hydrobromide and nothing else. Some have reported good results with Dextromethorphan Polystirex (found in "Delsym" brand), but this is a powerful variant that I wouldn't recommend. Also be aware to avoid anything containing ephedrine decongestant, or you'll be under suspicion of running a meth lab.

Best bet is "Robitussin Maximum Strength" which contains 15mg per teaspoon. Experiment with doses between 5-8 teaspoons, you should find a sweet spot that gives the edge you're looking for.

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