Which of the following is NOT one of the three essential things to know about medication you are administering?

Understanding the normal dosage is crucial for ensuring that patients receive the correct amount of medication, which minimizes the risk of overdose or underdose. Knowing the expected results helps in assessing the effectiveness of the medication and determining whether any adjustments need to be made in the treatment plan. Being aware of common side effects is important for monitoring the patient's response to the medication and for taking appropriate action if adverse effects occur.

The ideal time for administration is indeed important in medication management, but it can be dependent on various factors such as the specific medication, the condition being treated, and the individual patient's needs. While timely administration can enhance the medication’s effectiveness and adherence to the treatment regimen, it is not classified as one of the three essential foundational things to know about the medication itself in the same way that normal dosage, expected effects, and side effects are. Therefore, it stands out as the correct choice here, as it does not fit the same foundational criteria as the other aspects.