Well, you see, higher dosages of ibuprofen are prescription-only in the US. That is, 400 mg or higher. Of course, you can always take two 200 mg tablets, but (just theoretical, you understand) if someone was in Europe it might be possible to obtain higher doses per tablet and bring them into the US. One's husband might also have specifically asked a surgeon after a knee surgery to prescribe 800 mg ibuprofen instead of, say, Tylenol with codeine. Mind you, this is all supposition because you're not supposed to do those things.