Which term refers to a harmful reaction that may necessitate stopping a medication?

The term that refers to a harmful reaction that may necessitate stopping a medication is "Adverse Effect." Adverse effects are unintended and harmful reactions resulting from the administration of a medication. When a patient experiences such reactions, they may pose risks that outweigh the benefits of the medication, prompting healthcare providers to reconsider the prescribed treatment.

In contrast, side effects are common and often mild reactions that occur alongside the therapeutic effects of a drug but do not typically require the cessation of therapy. Therapeutic effects are the intended outcomes of the medication and are sought after in treatment. The term "No Effect" pertains to situations where a medication does not produce any observable therapeutic or adverse effects, which does not apply when discussing harmful reactions.

Understanding the distinction between these terms is vital for safe medication administration and prompt patient assessment and care.