I used the, I believe, dayquil version one time (active ingredient pseudoephedrine) in the US and my ability to focus that day was on a completely different lev

I used the, I believe, dayquil version one time (active ingredient pseudoephedrine) in the US and my ability to focus that day was on a completely different level even being sick. I almost wanted to keep using it for productivity purposes. Also love that I had to go to a controlled substance area of the pharmacy to get it.