Persian Source Library · Classical era — 9th to 13th century
Al-Razi (Rhazes)
Muhammad ibn Zakariya al-Razi (محمد بن زکریا رازی)
The work
Al-Hawi fi al-Tibb — The Comprehensive Book of Medicine
الحاوی فی الطب
854–925 CE
The Persian physician who insisted on 'first do no harm,' careful observation, and simple food before heroic remedies.
Al-Razi — Rhazes in Latin — was born in Rey, near modern Tehran, and directed hospitals in both Rey and Baghdad. He is remembered for a rigorously clinical mind: bedside case notes, controlled experiments (he chose the site of a new hospital by hanging meat in different neighborhoods to see where it spoiled slowest), and the earliest clinical description of smallpox and measles.
Al-Hawi, compiled posthumously from his working notebooks, is a vast case-based reference — his own observations woven with earlier Greek, Persian, and Indian sources. Two of his shorter works are equally important to Persian home medicine: Kitab al-Mansuri (The Book for Mansur) and Man la Yahdruhu al-Tabib (For One Without a Doctor at Hand).
In the Living Library, we cite Razi for his emphasis on gentle, simple, food-first remedies — the tradition of protecting digestion before reaching for a stronger herb — and for early observations on specific conditions like fever, dysentery, and children's illnesses.
What this text is known for
- First clinical description distinguishing smallpox from measles.
- Championed simple food, gentle remedies, and 'first do no harm' centuries before Hippocrates was rediscovered in Europe.
- Wrote For One Without a Doctor at Hand — an early home medical guide for ordinary people.
- Emphasized careful bedside observation over inherited authority.
Razi appears when a guide draws on the tradition of food-first, gentle-remedy-second — particularly for digestion, fever, and children's care.
Traditional Persian sources describe how a herb, food, or ritual was understood — never on their own a claim about modern outcomes. Where modern trials agree or disagree, the Living Library labels the difference clearly.
Further reading
- Encyclopædia Iranica — Rāzī, Moḥammad b. Zakarīyā — Iranica Online
- Kitab al-Hawi — digitized editions — World Digital Library / Library of Congress
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