Controlled Substance Ordering System (CSOS)
News & Updates
Please be advised that a scheduled system maintenance will take place on Friday, March 21, 2025, from 8:00 PM to 12:00 AM (ET). During this time, systems may be temporarily unavailable or experience intermittent disruptions.Virtual Training Sessions
CSOS Enhancements—Letter to Registrants (December 9, 2024)
CSOS Enhancements—Letter to Registrants (November 12, 2024)
CSOS Enhancements—Letter to Practitioners (October 16, 2024)
CSOS Enhancements—Letter to all other registrants (October 15, 2024)
DEA's Controlled Substance Ordering System (CSOS) is designed to provide services to DEA-registered pharmaceutical drug manufacturers, distributors, pharmacies, hospitals, and others to transmit customers’ orders electronically.
View the virtual training.
FAQ: Secure Hashing Algorithm (SHA) Transition
CSOS Questions & Answers
[1] Microsoft Knowledgebase Article: http://support.microsoft.com/kb/968730
[2] Hotfix for Windows Server 2003 and Windows XP: http://support.microsoft.com/hotfix/KBHotfix.aspx?kbnum=968730&kbln=en-us