There is something called the Ballmer Peak, which has even been demonstrated in one study. Up to a point, the theory goes, creative work benefits from mild intoxication. Beyond that point, productivity goes out the window. For me, I believe that point is around two drinks. For you, it could be teaspoons. Either way, I wouldn't generally drink before the end of the work day.

Personally, I find coding is hardest when you're blocked or stumped. Sometimes it helps to turn off the inner critic and experiment with code in a way that might feel unproductive during normal work hours. How I approach a problem outside of work is my business as long as the solution is solid.

This should go without saying, but everyone's physiology is different. While most people get drowsy from pseudoeffedrine, it makes me hyper. That's why even if one treatment works for most people, it might not work for you.