While I was drawing on this comic I stumbled upon an article that said that there actually were medicinal tablets in ancient Greece. About twenty years ago, an ancient Greek shipwreck was discovered, dating back to 130 BCE and containing boxes with medicinal tablets. Since this comic doesn't take place at a certain point in antiquity (rather all periods seem to exist at the same time, though I usually try to avoid things from the Roman period), I thought I should let Hades take such a tablet for his headache.
The article about the tablets didn't say much about what they looked like, though. So I wrote to Alain Touwaide, historian of medicine and sciences at the Smithsonian Institution, Washington D. C. who was doing research on them and asked if he could tell me, which he kindly did. They were round, 3 cm diameter, and 5 mm thickness. He also told me their external surface wasn't plain, since they were made of an amalgam of substances. I suspect my drawing of them isn't all correct, though.
Heh, the reference to the Oresteia!
And yeah, that story about Minos was disturbing in Miller's Circe.
Turns out Hades was just hangry LOL