The second edition of this book spans the broad range of modern therapeutic drugs, from small molecules to biologic recombinant proteins. It offers a comprehensive review of the classification and description of different drug-induced systemic and cutaneous hypersensitivities; an up-to-date coverage of individual culprit drugs in each group of therapeutics; the diagnosis and mechanisms of reactions; and important structure-activity relationships.  New content expands to two areas of drug allergy that have recently experienced explosive growth: biological therapies and new targeted chemotherapies. Other new and expanded chapters address antimicrobials; drugs used in anesthesia and surgery; opioids; non-targeted anti-cancer drugs; vaccines; and newly understood reaction mechanisms.