What term describes a harmful reaction experienced by a patient when receiving a medication at normal dosage?

The term that describes a harmful reaction experienced by a patient when receiving a medication at normal dosage is known as an adverse drug reaction (ADR). An ADR occurs when the drug produces unintended or undesired effects that are typically harmful and can vary in severity. These reactions can happen even when the patient takes the drug as prescribed and at the recommended dosage, making it a significant concern in pharmacology and patient safety.

Understanding ADRs is crucial as they highlight the complexity of drug interactions within the body, how certain individuals may react negatively despite following medical guidelines, and the importance of monitoring patients effectively when they are prescribed medications.