Diachylon Plaster
Historical document, translated for reference. It reflects medical knowledge of the 1920s–30s and is not medical advice.
Summary
Diachylon plaster is a lead-based ointment historically used to treat skin conditions like eczema and acne. Its composition has evolved over time, with modern formulations using white petrolatum instead of linseed oil to avoid unpleasant odors.
Encyclopedia entry (1928–1936)
DIACHYLON PLASTER, Hebra's lead plaster, Unguentum diachylon Hebrae. According to Formula VII, it is prepared from equal parts of lead plaster and white petrolatum. The plaster has a uniform consistency and a whitish color; it is prepared ex tempore. According to the German Pharmacopoeia of 1926, 2 parts of plaster and 3 parts of petrolatum are taken. Hebra, who was the first to apply such a plaster, wishing to reduce its cost, composed it from lead plaster and linseed oil, as a result of which the plaster acquired a very unpleasant odor upon storage. Subsequently, the prescription was changed, and instead of linseed oil, olive oil or white petrolatum began to be used. Diachylon plaster is used in moist eczemas, acne, and other skin diseases, as well as against foot sweat. The action of diachylon plaster is conditioned by the influence of lead (see).
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“Diachylon Plaster.” Soviet Medical Encyclopedia. English translation of Bolshaya Meditsinskaya Entsiklopediya, 1st ed. (Moscow, 1928–1936), ed. N. A. Semashko. https://sovietmedicalencyclopedia.pages.dev/article/diachylon-plaster/