Which of the following does NOT require a doctor's order for administration?

Over-the-counter medications do not require a doctor's order for administration. These medications are available without a prescription and can be used safely by individuals based on label instructions for treating common ailments such as headaches, colds, or allergies.

In contrast, options related to pre-existing conditions, musculoskeletal disorders, and pain management treatments typically involve the consideration of a patient's health history and specific diagnoses, necessitating a doctor's order to ensure safe and appropriate treatment. This is especially important for pain management treatments where the risk of misuse or adverse effects can be higher, thereby requiring professional oversight.