Which side effect would indicate the client is experiencing an adverse effect from carbidopa-levodopa?

Impaired voluntary movements would indeed indicate that a client is experiencing an adverse effect from carbidopa-levodopa. This medication is primarily used in the treatment of Parkinson's disease, where the goal is to replenish dopamine levels in the brain. One of the side effects of carbidopa-levodopa can be dyskinesias, which are abnormal, uncontrolled movements that can impair voluntary movement and affect the quality of life.

While carbidopa-levodopa can improve a patient's motor function and overall quality of life, it's important to monitor for any unexpected changes in movement patterns. The development of impaired voluntary movements can be a signal of either an excessive dopamine effect or fluctuating levels of the drug in the system, leading to motor complications.

In contrast, increased appetite, improved mood, and clearer thinking are generally considered positive responses to the medication, indicating its effectiveness in managing the symptoms of Parkinson's disease. These effects would not typically be viewed as adverse reactions to the treatment.