Which sign indicates that Trazodone is achieving the desired effect in the patient?

The desired effect of Trazodone, which is commonly used as an antidepressant and sleep aid, is generally related to its ability to assist patients in achieving restful sleep. Therefore, when a client sleeps through the night, it indicates that the medication is likely having the intended effect of improving sleep quality. This is particularly important for patients with Alzheimer's disease, as sleep disturbances are common and can exacerbate cognitive decline and behavioral issues.

Other signs mentioned, such as bladder control, denial of pain, and wandering behaviors, do not directly correlate with the primary purpose of Trazodone. While maintaining bladder control and managing pain are important aspects of patient care, they are not specific indicators of the medication's effectiveness in promoting sleep. Similarly, wandering behavior may be a symptom of Alzheimer's disease itself and does not reflect the positive outcome expected from Trazodone treatment. Thus, the ability to sleep through the night is a clear and relevant sign of the medication achieving its desired effect.