The Museum of the History of Lithuanian Medicine and Pharmacy has a prescription book by a pharmacist Teodor. Geldner from Telsiai (the tsarist Russia's Lithuanian Vilnius Governorate), dated 1830. Each medication that was produced at the pharmacy had to be registered in this book. The entries included the composition of the drug, its form, usage, price, the physician's name, and (sometimes) the method of production. This paper presents the content analysis of this book. The study revealed which medicines were used for the treatment of patients back then, which principles of therapy predominated, and what the social status of the patients was.