What were Al-Razi's contributions to the Islamic Golden Age?

Al-Razi, also known as Rhazes, was a prominent Persian physician and philosopher during the Islamic Golden Age, renowned for his pioneering contributions to medicine and chemistry. He is best known for his work "Kitab al-Hawi," an influential medical encyclopedia that compiled and expanded upon medical knowledge, emphasizing empirical observation and clinical practice. Al-Razi also made significant advancements in the field of chemistry, particularly through his studies of substances and their properties, laying the groundwork for future developments in alchemy and pharmacology. His emphasis on rationalism and systematic experimentation marked a critical shift in the approach to science during this period.