Which of the following is NOT considered an adverse drug event?

Medication authentication is not considered an adverse drug event because it pertains to the processes and systems in place to ensure that the right patient receives the correct medication. It involves verifying the identity of the patient, the accuracy of the medication prescribed, and confirming that it is administered correctly. This is a preventive measure aimed at avoiding adverse drug events rather than being a result of them.

In contrast, medication errors, side effects, and allergic reactions are all types of adverse drug events. Medication errors refer to mistakes in prescribing, dispensing, or administering medications that can harm patients. Side effects are unintended effects of a drug that occur at normal therapeutic doses. Allergic reactions occur when the immune system responds abnormally to a medication, which can also cause harm. All of these involve negative outcomes related to drug therapy, highlighting the importance of recognizing and managing these events in healthcare settings.