Why would anyone want to write about propranolol, the first clinically utilized beta blocker? It is, after all, an outdated medicine. However, that is precisely why it is important to write about this treatment. Propranolol has been used in medical practices since 1962 and still plays an important role as a remedy for various diseases. Although primarily used in cardiovascular cases, it is also used in neurology, endocrinology, psychiatry and gastroenterology. Unfortunately, newly discovered beta blockers have replaced the use of propranolol as a regular treatment for cardiologists. Despite this, we strongly believe in conducting new studies that may show properties in propranolol being more beneficial to patients in some cases than new beta blockers. There are situations now and then where all other forms of modern medicine have proven futile in aiding physicians with their practices. Many of these cases report new and interesting indications that show propranolol might work more efficiently under particular conditions. This book provides readers with the benefits of propranolol in different branches of the medical field. The authors of these chapters are elected, distinguished experts of different medical disciplines from all around the world. It was a great pleasure to gather their influential and respectable viewpoints about this neglected medicine. Additionally, the future of propranolol in terms of chemical theory is deliberated within these pages. The authors' main objective was to shed light on the universality of propranolol. They hope to help save the use of this pharmaceutical before it is completely superseded by ever-evolving drugs.