Which of the following must be documented in a drug's prescribing information?

The documentation of symptoms and treatment of overdose in a drug's prescribing information is crucial because it directly pertains to the safety and management of adverse effects associated with the medication. In the prescribing information, healthcare professionals need clear guidance on how to identify an overdose and the appropriate measures to take in such an event. This knowledge is vital for clinicians when making treatment decisions and is integral to ensuring patient safety.

In contrast, dosage form changes may be relevant but are not universally required to be documented in prescribing information unless they significantly impact the drug's use or safety profile. Marketing strategies and the cost of production are unrelated to the clinical use or safety of the medication and therefore do not belong in the prescribing information, which is intended solely for providing critical clinical data to healthcare providers.