What did rhazes and avicenna write what?

Rhazes (Al-Razi) and Avicenna (Ibn Sina) were prominent medieval Persian scholars who made significant contributions to medicine and philosophy. Rhazes is known for his work "Kitab al-Hawi," a comprehensive medical encyclopedia that emphasized clinical observation and experimentation. Avicenna authored "The Canon of Medicine" (Al-Qanun fi al-Tibb), which systematized medical knowledge of the time and remained a standard text in both the Islamic world and Europe for centuries. Their writings laid foundational principles in medicine and greatly influenced later scholars and practitioners.