This book is the first comprehensive reference to the relationship between a myriad of drugs commonly used in neurology, psychiatry and internal medicine, and the occurrence of acute or sub-acute encephalopathy. In 12 chapters, highly-skilled, well-known experts in the field discuss the determinants, natural courses, genetics, pathophysiology and treatment of most of the drug related encephalopathies which have relevance in clinical practice. This text provides new insights on the use of drugs and is an essential source of assistance for neurologists, psychiatrists, neurosurgeons, other clinicians and trainees at all levels who treat neurological patients.