Al-Razi was a strong advocate for rationalism and empirical observation in both medicine and philosophy. He believed that knowledge should be based on reason and experience rather than on blind faith or traditional authority.

Al-Razi emphasized the importance of ethics in medical practice. He believed that physicians should be compassionate, honest, and dedicated to the well-being of their patients. His writings reflect a strong concern for the ethical responsibilities of medical professionals.

Al-Razi authored several philosophical works, which are less well-known than his medical writings. These works addressed topics such as the nature of the soul, the problem of evil, and the relationship between reason and revelation. Unfortunately, some of his philosophical works were controversial and led to criticism.