The Opus Pandectarum medicinae, known as Pandects, is one of the most famous medieval antidotaries: a dictionary of medicinal plants with indications on their uses and properties. Written by Matteo Selvatico (1285 – 1342), a doctor from Salerno, the text collects botanical and medical information. Selvatico began the work in 1297 and dedicated it to Robert of Anjou in 1317. The Pandects, reprinted until the end of the 16th century, include descriptions of 721 "simples" (487 vegetables, 157 minerals, 77 animals). The Author, thanks to his numerous travels and collaborations, enriched the work with direct observations and critical comments, significantly contributing to the knowledge of medieval medicine.