What is a potential risk when a patient has an idiosyncratic reaction to a medication?

An idiosyncratic reaction to a medication refers to an unusual or unexpected response that occurs in an individual, which is not related to the known pharmacological effects of the drug. Such reactions can vary significantly from patient to patient. The correct choice highlights that individuals may either underreact or overreact to the medication, demonstrating the unpredictable nature of these responses.

This unpredictability poses a significant risk, as it may lead to either inadequate therapeutic effects if the patient underreacts or potentially harmful effects if they overreact. These varying responses underscore the necessity for careful monitoring and individualized treatment plans when administering medications, especially in cases where patients have previously shown idiosyncratic reactions.

Other options imply limitations or absolutes regarding the reactions, such as suggesting they are always mild, easily treatable, or not requiring medical attention, which misrepresents the unpredictable nature of idiosyncratic reactions. Such assumptions can lead to inadequate care or a failure to respond appropriately to a serious situation.