Principles of Pharmacology for Medical Assisting, Fourth Edition is the only pharmacology book written specifically for medical assistants. It describes the scope of practice, follows the latest Standards and Guidelines for CAAHEP accreditation, and has a new full-color presentation. New content in this edition includes the addition of 230 new drugs with classifications, the removal of out-of-date drugs, content on herbals and supplements, sample drug labels, information on syringes and safety needles, topical material such as obesity, and an emphasis on patient teaching and safety precautions. The book includes special features such as competency-based objectives, practice problems for reinforcement of concepts, performance checklists for procedures, spotlight on health, Web sites, and self-assessments.