Code of Federal Regulations Title 21. Food and Drugs § 21.290.10 Definition of emergency situation

(a) That immediate administration of the controlled substance is necessary, for proper treatment of the intended ultimate user;  and

(b) That no appropriate alternative treatment is available, including administration of a drug which is not a controlled substance under schedule II of the Act, and

(c) That it is not reasonably possible for the prescribing practitioner to provide a written prescription to be presented to the person dispensing the substance, prior to the dispensing.