A standard dose (tablet) of 250mg and 300mg seem common in Europe, 325mg in the US. 500mg is "extra strength". E.g. https://www.walgreens.com/search/results.jsp

A standard dose (tablet) of 250mg and 300mg seem common in Europe, 325mg in the US. 500mg is "extra strength". E.g. https://www.walgreens.com/search/results.jsp?N=2000010035&Ntt=Aspirin https://www.walgreens.com/search/results.jsp?N=2000010035&Nt....