DoctorLib is an online medical library offering a large collection of books for readers to explore and share. Its catalog covers a broad range of medical and health topics, serving students, healthcare professionals, and general readers seeking reference or educational material. Subject areas include anatomy, anesthesiology, cardiology, dietetics, endocrinology, gastroenterology, genetics, geriatrics, gynecology, immunology, infectious diseases, neurology, oncology, pediatrics, psychiatry, surgery, and urology, alongside wellness topics such as yoga, fitness, sleep, and nutrition.

The collection features textbooks, clinical guides, atlases, board-review resources, and practical handbooks. Examples include works on clinical anesthesia, human anatomy, obstetrics and gynecology, cardiovascular medicine, infectious diseases, and healthy eating. DoctorLib organizes its materials by specialty and topic, making it easier for visitors to browse relevant titles across both clinical disciplines and general health subjects. The site presents itself as a free online resource focused on medical books, with content spanning foundational study, professional practice, and personal wellbeing.