What is contraindicated when administering medications to a patient?

When administering medications to a patient, giving a medication that the patient is allergic to is contraindicated because it can lead to serious allergic reactions, which may include symptoms like hives, difficulty breathing, or anaphylactic shock. Understanding a patient's allergy history is crucial in preventing harm. Allergies can vary in severity, and administering a drug that a patient is known to be allergic to violates safety protocols and clinical standards. This principle ensures not just compliance with best practices in medication administration but also prioritizes patient safety and well-being.

On the other hand, administering medications prescribed by a doctor, using over-the-counter medications as advised, and administering multiple medications that are deemed safe are all standard practices when following proper guidelines regarding medication administration.