When a new drug is developed, the manufacturer assigns a code name to the drug. Once the drug is approved, it gets a USAN—a nonproprietary generic name. This becomes the official name once the drug gets listed in the United States Pharmacopeia. The drug is also assigned a proprietary name or trademark by the manufacturer, which becomes the manufacturer's brand name. The same manufacturer can market the same drug using different proprietary names in different countries. A single drug can have multiple proprietary names assigned by different manufacturing companies. In such cases, nonproprietary names of drugs are more helpful as they identify the drug with its pharmacological class. A nonproprietary name is preferred during prescription as it can save money and is easier to communicate. To maintain the quality of drugs and desired therapeutic effects, the FDA has set bioavailability standards and information about therapeutic equivalence evaluation is compiled in an official publication.