Plato, Symposium 185d-e
It’s Aristophanes’ turn to make a speech, but he’s been overcome by hiccups. Doctor Eryximachus steps in to speak, but not before offering his medical advice:
ἐν ᾧ δ’ ἂν ἐγὼ λέγω, ἐὰν μέν σοι ἐθέλῃ ἀπνευστὶ ἔχοντι πολὺν χρόνον παύεσθαι ἡ λύγξ· εἰ δὲ μή, ὕδατι ἀνακογχυλίασον. εἰ δ’ ἄρα πάνυ ἰσχυρά ἐστιν, ἀναλαβών τι τοιοῦτον οἵῳ κινήσαις ἂν τὴν ῥῖνα, πτάρε· καὶ ἐὰν τοῦτο ποιήσῃς ἅπαξ ἢ δίς, καὶ εἰ πάνυ ἰσχυρά ἐστι, παύσεται.
And while I’m speaking, if you would hold your breath for some time, the hiccups will stop. But if they don’t, gargle with water. And if the hiccups are still just as strong, take hold of something to tickle your nose with and sneeze: if you sneeze once or twice even the strongest hiccups will be stopped.