Antidotaria are full recipes with a number of ingredients that usually have a name – such as Aqua Matricariae – and include the ingredients, the purpose, the procedure and extra information.
Receptaria are short recipes frequently without a name, with fewer ingredients and fewer steps in the procedure. They can be described as being ‘medicine for…’.
Experimenta are based on first hand experience and observation or hearsay by a physician (or a doctor-without-degree). They could be experiments conducted by the author or learned from colleagues. They are found in commonplace books that physicians wrote for themselves. Such a book would have been divided into headings and blank pages and subsequently filled with notes and recipes.