How many books make up Avicenna’s The Canon of Medicine?

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Avicenna’s The Canon of Medicine is organized into five books.1

The structure of the work is as follows:
* Book I: Contains four treatises covering the four elements, humours, anatomy, etiology, symptoms, hygiene, and therapeutic nosology.1
* Book II: A "Materia Medica" containing a compendium of drugs.1
* Book III: Covers "Head-to-Toe Diseases".1
* Book IV: Examines diseases not specific to certain organs, such as fevers and systemic pathologies.1
* Book V: Presents "Compound Drugs," including theriacs and electuaries.1