Plasters are a class of solid preparations for external use and serve either as simple adhesives or as counter-irritants. The official plasters are practically never used but are replaced by the commercial plasters made on a large scale by machinery, which have as a base a mixture of rubber, with solvents or diluents.

For preparation included in this list see: Emplastrum Belladonnae, under Belladonnae Folia.