This book, now in a revised and updated second edition, reviews the imaging-relevant features of selected classes of pharmaceuticals and drugs regarding CNS and head and neck images. The agents discussed belong to classes like Drugs and Alcohol; Contrast Agents; Chemotherapy; Immunotherapy; Antibiotics, Antiviral Agents, and Vaccines; Antiepilectic and Antipsychotic Agents; and Hematologic Agents, each of which is addressed in a separate chapter. The book's closing part addresses agents from various other classes. For each class, concise texts and rich images review and illustrate the mechanism of action. All chapters from the previous edition have been extensively updated, and new chapters on certain pharmaceuticals have been added. Highlighting the implications of these agents for imaging findings, the book offers an excellent resource for neuroradiologists and clinicians alike.