Then
His compendium became a reference across the Islamic world and later Europe, influencing teaching hospitals and clinical practice.
Timeline of Discovery · 3 / 30
Al-Razi
c. 865 - 925 · Islamic Golden Age (Persia)
Al-Razi, known in Europe as Rhazes, was a physician and chemist who emphasised careful clinical observation and wrote an influential survey of medicine.
- Medicine
- Chemistry
- Islamic Golden Age
Lived
c. 865 - 925
Era
Islamic Golden Age
Primary field
Medicine
Signature idea
Pioneering physician and chemist; isolated alcohol
Their place in history
c. 865 - 925
The question they asked
How can a physician judge disease and treatment from careful observation of the patient rather than from theory alone?
The Contribution
What this scientist actually did — precisely and plainly.
He wrote the “Kitab al-Hawi”, a vast medical compendium, and is remembered for distinguishing smallpox from measles and for advocating empirical, ethical medical practice.
How the Work Advanced Knowledge
The tools, experiments and reasoning behind the discovery.
He kept detailed case notes from his hospitals, compared treatments, and weighed evidence from his own observations and earlier authorities.
Why It Mattered Then / Today
From their own moment in history to the world we live in now.
Today
Observational medicine, case documentation and the ethical cautions he voiced preview the bedside methods at the heart of modern clinical training.
Important Works or Discoveries
Landmarks that carried the idea into the world.
- Kitab al-Hawi (The Comprehensive Book on Medicine)
- Treatise on Smallpox and Measles
- Doubts about Galen
Sources
Where this profile was verified.
Last reviewed: 2026-09-22
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