Etki süresi refers to the duration during which a particular effect or influence remains active or relevant. This term is often used in various fields, including medicine, psychology, and environmental science, to describe how long a treatment, behavior, or environmental change continues to have an impact. In the context of medications, for example, etki süresi indicates how long a drug remains effective in the body after administration. Understanding this duration is crucial for determining dosing schedules and ensuring optimal therapeutic outcomes for patients.