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Which books of Natural History discuss medicine and drugs?

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In his encyclopaedic work Natural History, Pliny the Elder dedicates Books XX through XXXII to the subjects of medicine and drugs.21

Within these volumes, Pliny provides insights into the commercial sources and pricing of drug ingredients, while also offering moralistic commentary on diet and the health consequences of luxury and high living. His writings on these topics, which often incorporated folklore and a belief in magic, significantly influenced medical theory in the centuries that followed.21