Before we get started, let me be clear that any information contained here, although to be best of my knowledge accurate, in in no way intended to be a substitute for advice and care from licensed medical professionals. OK, disclaimer stated.
Aspirin is one of the first synthetic drugs, and is still in wide use after over 100 years. It was first marketed by Bayer in 1899, and sales are still strong despite competition from drugs like acetaminophen, ibuprofen, and naproxin sodium. Bayer has in the past week or two come out with a new advert about its new “quick acting” aspirin.
This material is “quick acting” because the particle size is much smaller than that of regular aspirin. Since aspirin is only slowly soluble in water, the greater surface area for the same mass does speed up absorption.