Final answer:
The nurse should instruct the female client to finish the medication in order to resolve the infection.
Step-by-step explanation:
The nurse should instruct the female client to "finish the medication in order to resolve the infection." Phenazopyridine, commonly prescribed for symptomatic relief in acute cystitis, does not treat the underlying infection. Completing the full course of antibiotics is crucial for eradicating the infection entirely. While phenazopyridine alleviates discomfort by providing relief from urinary symptoms, it is not a substitute for antibiotics. Emphasizing the importance of adherence to the prescribed antibiotic regimen ensures that the infection is effectively treated, minimizing the risk of recurrence and complications. Clear patient education on the necessity of completing the antibiotic course promotes optimal recovery and overall health.