| Entry into force: | 25 September 1928. |
| Registration: | 25 September 1928, No. 18451. |
Note: In accordance with its article 44 (1), the provisions of the Single Convention on Narcotic Drugs, 1961, as amended by the Protocol amending the Single Convention on Narocitc Drugs, 1961 of 8 August 1975, as between the parties thereto, terminates and replaces the provisions of the above Protocol. See chapter VI.18.
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| Argentina | (Apr 18th, 1946) |
| British Empire | (Feb 17th, 1926) |
| (Same reservation as for the Convention.) | |
| State of Sarawak | (Mar 11th, 1926 a) |
| Bahamas | (Oct 22nd, 1926 a) |
| Burma2 | |
| Canada | (Jun 27th, 1928) |
| Australia | (Feb 17th, 1926) |
| New Zealand | (Feb 17th, 1926) |
| Union of South Africa | (Feb 17th, 1926) |
| India | (Feb 17th, 1926) |
| Iraq | (Aug 8th, 1931 a) |
| Bolivia | (Apr 15th, 1932 a) |
| Bulgaria | (Mar 9th, 1927) |
| Chile | (Apr 11th, 1933) |
| Colombia | (Dec 3rd, 1930 a) |
| Costa Rica | (Jan 8th, 1935 a) |
| Cuba | (Jul 6th, 1931) |
| Czechoslovakia3 | (Apr 11th, 1927) |
| Ecuador | (Oct 23rd, 1934 a) |
| Egypt | (Mar 16th, 1926 a) |
| Estonia | (Aug 30th, 1930 a) |
| Finland | (Dec 5th, 1927 a) |
| Germany | (Aug 15th, 1929) |
| Greece | (Dec 10th, 1929) |
| Haiti | (Nov 30th, 1938 a) |
| Honduras | (Sep 21st, 1934 a) |
| Japan | (Oct 10th, 1928) |
| Latvia | (Oct 31st, 1928) |
| Luxembourg | (Mar 27th, 1928) |
| Netherlands | (Jun 4th, 1928) |
| (including Netherlands Indies, Surinam and Curaçao) | |
| Portugal | (Sep 13th, 1926) |
| Romania | (May 18th, 1928 a) |
| Salvador | (Dec 2nd, 1926 a) |
| Spain | (Apr 19th, 1930 a)Sudan (Feb 20th, 1926) |
| Thailand | (Oct 11th, 1929) |
| Turkey | (Apr 3rd, 1933 a) |
| Venezuela | (Jun 19th, 1929 a) |
| Yugoslavia (former)4 | (Sep 4th, 1929) |
Albania | Iran | Nicaragua | |
| Participant | Succession (d) |
| Bahamas | 13 Aug 1975 d |
| Czech Republic3 | 30 Dec 1993 d |
| Fiji | 1 Nov 1971 d |
| Papua New Guinea | 28 Oct 1980 d |
| Slovakia3 | 28 May 1993 d |
| Tonga | 5 Sep 1973 d |
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1. See League of Nations, Treaty Series, vol. 81, p. 317.
2. See note 1 under "Myanmar" in the "Historical Information" section in the front matter of this volume.
3. See note 1 under "Czech Republic" and note 1 under "Slovakia" in the "Historical Information" section in the front matter of this volume.
4. See note 1 under "Bosnia and Herzegovina", "Croatia", "former Yugoslavia", "Slovenia", "The Former Yugoslav Republic of Macedonia" and "Yugoslavia" in the "Historical Information" section in the front matter of this volume.