Which indication would show that buspirone (BuSpar) is effective for a client?

Buspirone (BuSpar) is primarily indicated for the treatment of anxiety disorders. Its efficacy can be gauged by the reduction of anxiety symptoms. In this case, the indication that suggests its effectiveness is the absence of rapid heartbeats or anxiety in the client.

Anxiety can manifest in various physical and psychological symptoms, including increased heart rate, restlessness, and excessive worry. When buspirone is effective, it should help alleviate these symptoms, leading to a more stable heart rate and a decrease in anxiety levels. Therefore, observing that the client does not experience rapid heartbeats or anxiety implies that the medication is achieving its intended effect of managing anxiety.

Regarding the other indications, while improvements in thought processes and lack of withdrawal symptoms are important in certain contexts, they are not direct measures of buspirone's effectiveness, which specifically targets anxiety management. Thus, a client’s absence of anxiety symptoms and stabilization of heart rate is a clear indication of the medication working as intended.