This document outlines different types of homeopathic materia medica that have been published since Dr. Hahnemann introduced the concept in 1811. It describes 8 categories of materia medica including those focused on proven symptoms, physiological effects, clinical applications, comparative analyses, therapeutics, descriptive pictures, expressive pictures, and poetic formats. Over 372 books on materia medica have been published in different languages to systematically record and classify the vast amount of symptom and remedy information in homeopathy.