Talk Like An Apothecary Meaning

Example : 1824, Naso., Sneezing, in The New Monthly Magazine, volume X, page 152:  As to Clement of Alexandria, I shall pass him by, as he knew nothing about the matter. He talks like an apothecary on the subject; and when did ever an apothecary talk to any purpose?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."