Testing and standardization are firmly entrenched in the pharmacological imagination of western biomedicine and its public. Before a new drug can be put on the market, the U.S. Food and Drug Administration demands five rounds of trials. Approximately 70% of new ‘recipes’ fails to pass the first round. Similarly, the European Medicines Agency maintains a database of adverse drug reactions (EudraVigilance) which, growing of one million entries yearly, is used to monitor all pharmaceuticals on sale across the European Economic Area. Meanwhile, the media seizes upon the perils of untested cures as if on morality tales, policing the boundaries of modern science from potential intrusion from the miraculous and the charlatanesque.
Yet, can the same be said of premodern drug manufacturing? Was a drug’s efficacy established by testing? And what did ‘testing’ recipes even mean in the sixteenth and seventeenth centuries? When these questions were suggested at Elaine Leong and Alisha Rankin’s Testing Drugs, Trying Cures Workshop in 2013, I began to look for answers among those early modern medical practitioners who most closely resemble the pharmaceutical industry of our times, combining the manufacturing of a Glaxo Smith-Kline and AstraZeneca with the retailing of Boots and Walgreens: apothecaries. 
While not corporate giants, apothecaries thrived in every large hamlet and town of Italy, reaching spectacular numbers in metropolises like Rome, Naples, and Venice. Unlike free-lance alchemists and empirics, they belonged to the city’s official infrastructure of healthcare: they worked from a licensed shop, trained through formal apprenticeship and, like physicians and surgeons, belonged to a professional association or arte. This ‘trade brotherhood’ gave them bargaining powers but also subjected them to standardization rules and quality controls. As disgruntled masters testify from the archives, in severe cases of infraction the apothecary could see the remedies he had belaboured on for weeks thrown into the gutter or burnt to ashes.
So what did it mean to have ‘correct’ remedies that passed the test of shop inspections and satisfied “God and the public good”? As a historian of artisan knowledge I have learnt that infractions, those occasions when things go (deliberately) wrong, sometimes provide the best clue to understanding which methods of doing things were considered orthodox in the crafts. Apothecaries loved to speak of the abuses supposedly perpetrated by their colleagues. In Florence, for example, they conned customers by mixing expensive guaiac wood with the bark of mulberry trees. In Mantua and Padua, those with a fever and a bad stomach better beware the Lenitive Electuary, regularly adulterated with black sugar (instead of its fine white variety) and counterfeit tamarinds (mimicked by a paste made of old cassia and badly preserved dates ).
These complaints were not the only ones to be voiced, but they are telling. They are not motivated by protestations from patients, who are remarkably absent from the writings of early modern apothecaries. Nor are they driven by doubts about the method employed to make the remedy from a set of instructions. While household experimenters and professors of secrets were always seeking new formulas and ways to stabilise them, the corpus of remedies sold in sixteenth-century Italian pharmacies was fairly stable, and so were their recipes.
What these criticisms suggested, rather, was that medicinal ingredients possessed a purity, and that this purity had been tainted. The rogue apothecary had played around with the ‘honesty’ of simples, diluting their strength or altogether replacing the ‘sincere originals’ prescribed in the recipe with fraudulent alternatives (often from the kitchen pantry).
With this concern for authenticity in mind, I returned to the apothecaries’ writings, and especially to two bestselling pharmacopoeias, Girolamo Calestani of Parma’s Observations on the Antidotes and Medicaments Most Used in Italy (1562), and Giorgio Melichio of Venice’s Warnings on the Compound Remedies in Use in Pharmacy (1575). Leafing through these texts, I made a curious discovery. Repeatedly, key plant and mineral ingredients in their recipes were referred to according to their reputed truth or falsity: e.g. “true cinnamon”, “true rhaponticum”, “false stibium”, “false balsam”. Repeatedly, apothecaries stressed the importance of sourcing these authentic materials, while their absence was said to ruin the preparation.
Even the use of substitutes began to be criticised. The practice of substituting one ingredient with another possessing similar qualities (quid pro quo), usually a local simple for an exotic import difficult to acquire, had been necessary since antiquity. Yet, the changing attitude to substitutions in the sixteenth century is summarised well by the Neapolitan physician Bartolomeo Maranta: “Substitutes are an abuse.” Never more so than for Theriac, the most celebrated antidote of Italian pharmacy and the toughest to prepare with over sixty ingredients. A Theriac with substitutes instead of true ingredients, Maranta declared, “will be itself in a certain way sick”.
How should we interpret such appeal to the truthfulness of ingredients? At a superficial level, we can understand the apothecary wanting to reassure the public of the genuineness of his wares. After all, practitioners of pharmacy were often portrayed as profiteers and cheats. But, as I argue in my article “Pharmacy, Testing and the Language of Truth in Renaissance Italy,” something else had changed between the medieval period and the 1540s, when this terminology of trues and falses appears: Greek and Roman books on materia medica were reintroduced into western Europe. It is well known that the reappearance of Dioscorides’s On Medicinal Plants, Theophrastus’s On Plants and Pliny’s revised Natural History created as many problems as it solved for those who wished to implement their teachings. Many of the Mediterranean and Levantine simples described in them remained entirely unavailable during the sixteenth century, while many others were plagued by problems of identification and nomenclature.
My sense is that this ‘Language of Truth’ was an intervention into this state of affairs. It helped the apothecaries get a grip on which was which among rare ingredients, and reflected their aspiration, shared with many contemporaries, of restoring the wisdom of the ancients. It also showed the increasing influence on pharmacy of the contemporary botanical renaissance and the ethos of naturalists who, for the first time, put nature in the foreground, liberating flowers, trees, animals and rocks from the need to be useful.
Crucially, authenticity came to replace experimentation. As ingredients acquired more importance in the apothecary’s mind, the efficacy of the recipe began to be pegged to their presence and quality. Providing the remedy contained the true, correct ingredients its efficacy and fitness for human consumption would be guaranteed, with no need to involve test subjects or pursue the feedback of patients and colleagues. How much this ‘testing by truth’ differed from modern-day trials becomes clear when we turn to the contemporary idiom of the pharmaceutical industry: it is as if the apothecaries’ R&D stopped at the preclinical stage.
 V. Pugliano, “Pharmacy, Testing and the Language of Truth”, Bulletin of the History of Medicine 92/2 (2017): 233-273. See also the other articles in the same issue of BHM.
 Ricettario Fiorentino dell’Arte dei Medici e Spetiali di Firenze (Florence, 1574), pp. 45, 74; Giovanni Antonio Lodetto, Dialogo degl’inganni d’alcuni malvagi speciali (Padua, 1572), pp. 21-22.
 Giorgio Melichio, Avvertimenti nelle compositioni per uso della spetiaria (Venice, 1601), pp. 27-28.
 Bartolomeo Maranta, Della Theriaca et Mithridato libri due (Naples, 1572), p. 33.