This updated Fourth Edition continues to serve as a comprehensive introduction to family medicine. Written at the clerkship level, it groups chapters into three sections: Principles of Family Medicine, Promoting Health throughout Life, and Common Problems. New to this edition is a feature called Careers in Family Medicine, three additional chapters, and a division of respiratory tract infections expanded and split into upper and lower. Its user-friendly style makes the book a lasting companion tool for the approach to diagnosing and treating common problems. Comes with a CD-ROM that contains 100 USMLE-style questions with explanations to accompany the text.
This book is pretty complete when it comes to topics in family medicine, but (much like family medicine itself) it's kind of superficial and doesn't go into enough depth on the pathophysiology of each condition, how to diagnosis it, how to treat it, etc. It was definitely enough for my med school's departmental clerkship exam (I read the text in its entirety and I aced the exam), but it lacks the thorough explanations that you really need to understand all of the pathology that you encounter in family medicine.
Additionally, since family medicine is largely a lot of preventative medicine and the recommendations about screening, vaccines, etc. are often changing, any textbook is probably not the best source for that kind of information. However, shelf exams are made up of old USMLE step 2 questions, so any questions you might encounter on that exam would probably be sufficiently answered in a relatively recent textbook, like this one.