What is an adverse drug reaction (ADR)?

An adverse drug reaction (ADR) specifically refers to any unwanted or harmful reaction that occurs after the administration of a medication. This definition highlights that these reactions are typically not the intended effects of the medication, distinguishing them from therapeutic effects. ADRs can range in severity and can affect individuals differently, depending on various factors such as genetics, age, and overall health.

Understanding that ADRs can vary in their manifestations—from mild discomfort to severe complications—is crucial for healthcare professionals managing patient care. Recognizing the potential for ADRs is an important part of ensuring patient safety, as these reactions can lead to significant health issues if not monitored and addressed promptly. As a result, this understanding aids pharmacy technicians in their role to counsel patients about their medications, identify potential ADRs, and report them to healthcare providers when necessary.