Stability is one of the most important characteristics that a high-quality medicinal product must possess. However, questions of durability arise not only for finished medicinal products and magistral preparations but also for raw materials stored in pharmacies. The book contains the usability periods of 2,156 active substances, excipients, herbs, and preparations, within which they can be used for the production of medicines while adhering to the prescribed storage conditions. This includes information on 280 herbs from Traditional Chinese Medicine (TCM). Additionally, it offers suggestions for organizing and documenting the stability control of raw materials, as well as for determining the shelf life of compounded medicines. Dr. Karsten Albert is a specialist pharmacist in Pharmaceutical Technology and a former head of the Central Testing Laboratory.