This book is intended to serve as a reference work for pharmacists, doctors, nurses, and other healthcare professionals. The introductory section discusses the legal aspects of herbal medicines, including licensed and non-licensed products in the UK and European Union, and their quality, safety and efficacy. The main body of the book consists of 152 monographs on individual herbal ingredients found in herbal products used in the UK, particularly in those sold through pharmacies. Each monograph comprises the following information: summary and pharmaceutical comment; species; synonym(s); part(s) used; pharmacopoeial and other monographs; UK legal category; constituents; chemical structural formulae; quality of plant material and commercial products; food use; herbal use; photographs; dosage; pharmacological actions; side-effects/toxicity; contra-indications/warnings; preparations; and references. This edition includes a new chapter on chemical constituents of plants used as herbal medicines, as well as new monographs on Petasites hybridus, Chelidonium majus, Piper methysticum and Rhodiola rosea, complete revisions of 10 existing monographs, substantial updates and revisions to over 20 other monographs, photographs of the crude herbal drugs and the plants from which they originate, and notes from several countries on marketed products.