Talk-like-an-apothecary meaning

July, 1807, Omar and Fatima; or, the Apothecary of Ispahan, published in the Literary Magazine and American Register, volume VIII, number 46, page 6.

"And you have so little of the former left," said the old woman, as she presented him with a plate of the aliment and a glass of the menstruum, "that without we have a fresh supply, I foresee that you will be reduced to live upon your own medicines."

"You do not talk like an apothecary," said Nadir, "if you expect that I could exist upon them in the way you suggest."