What is the term for an unexpected reaction to a medication?

An unexpected reaction to a medication is referred to as an adverse drug reaction. This term encompasses a wide range of undesirable effects that may arise from the use of medication, which are not part of the medication's intended benefits. Adverse drug reactions can occur even when the medication is administered correctly and at the recommended dose.

This classification includes severe reactions, such as anaphylaxis, as well as milder ones that may still cause concern. It’s crucial for healthcare professionals to monitor patients for these reactions, as they can inform both the safety and efficacy of the medication being used.

Understanding the nuances of adverse drug reactions is essential in clinical settings, as they can impact treatment decisions and patient outcomes. In contrast to side effects, which are typically known and anticipated consequences of medication, adverse drug reactions highlight the unpredictable nature of how individuals may respond to pharmacological treatments.