What does it indicate if a medication is 'on back order'?

When a medication is labeled as 'on back order,' it signifies that while the medication is not currently available, there is an expectation that it will be restocked and available for dispensing in the near future. This situation typically occurs when the supplier has encountered delays in production or distribution, meaning that the medication is temporarily unavailable but is not discontinued. It indicates that the pharmacy can anticipate receiving more of this medication based on the supplier's information. In contrast, options indicating permanent discontinuation, limited availability, or reformulation do not convey the same expectation of future availability.