Which piece of information is NOT required on a manufacturer's container of an OTC medication?

The information that is not required on a manufacturer's container of an over-the-counter (OTC) medication is the Poison Control Center phone number. While including a Poison Control Center number may be beneficial for consumers, federal regulations do not mandate its presence on OTC medication packaging.

The active ingredients, directions for use, and warnings are all critical components that must be included on OTC medication labels as per the Drug Approval process. The active ingredients provide essential information about what is in the medication and its therapeutic effects. Directions for use guide consumers on how to properly take the medication, ensuring safety and effectiveness. Warnings offer necessary precautions that inform users about potential side effects or risks associated with the use of the medication.

In summary, while the inclusion of a Poison Control Center phone number is a good practice for safety purposes, it is not a requirement, unlike the other pieces of information that are essential for the safe use of OTC medications.