Protocol for Limiting and Regulating the Cultivation of the Poppy Plant, the Production of, International and Wholesale Trade in, and Use of Opium

Article 6 of the treaty limited opium production to seven countries. Article 2 stated that Parties were required to "limit the use of opium exclusively to medical and scientific needs". It did not receive sufficient ratifications to enter into force until 1963, by which time it had been superseded by the 1961 Single Convention on Narcotic Drugs.