QuoteAs Nate has been mentioning lately, didn't the ancient Greeks have access to perhaps even hallucinogenic drugs that might also have been used for pain?
Opium and Cannabis at the very least.
Martin mentioned dysentery, but I was under the impression that it was known to have been strangury caused by kidney stones--in which case a warm bath is very commonly recommended to relieve pain related to swelling. And alcohol being a diuretic, meaning that it increases water loss through urine, might slightly increase the chance of flushing the stone. So not a terrible approach given the barbarous state of medicine at the time!