The guide "Rational Phytotherapy" offers a comprehensive and practice-oriented introduction to modern phytotherapy, which is relevant for both medical practice and pharmacies. In its 5th edition, the book is systematically organized by organ systems and areas of application, providing a quick overview of the dosage, forms of application, and effects of the most important herbal medicines. New in this edition is a chapter on the approval of herbal medicines as well as a pharmaceutical policy assessment in comparison to synthetic drugs. All discussed substances have been updated regarding their effects and approvals, and the table contents have been brought up to date. This standard work is thus an indispensable reference for professionals involved in the application of phytotherapy.