What does "an empty stomach" specifically means?

Example, “take the sildenafil pill with an empty stomatch”. Does this mean 1 hour after eating? 2 hours? 4 hours? this was never clear to me. I mean it probably means on the amount, let’s say a breakfast, some bread, some protein like cold turkey, some fats so add some cheese, orange juice… when do I take the sildenafil after that?

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