What information is NOT required on an OTC medication label?

For over-the-counter (OTC) medications, certain information must be included on the label to ensure consumer safety and proper usage. Inactive ingredients are required as they provide vital information for individuals with allergies or sensitivities. Directions for use are also mandatory, as they inform the consumer how to safely and effectively use the product. The expiration date is required to assure that the consumer is aware of the product's shelf life and efficacy.

On the other hand, the National Drug Code (NDC) number, while useful for identifying the specific product and facilitating drug dispensing and inventory management, is not a mandated element of an OTC medication label. The NDC is more commonly found on prescription medications and serves purposes for manufacturers and pharmacies, but it is not required for consumer labeling of OTC drugs. Thus, the NDC number is the correct answer as it is not required on an OTC medication label.