Final answer:
A decreased respiratory rate indicates a therapeutic effect of ceftriaxone in a patient with bacterial pneumonia.
Step-by-step explanation:
A nurse is collecting data from a client who has bacterial pneumonia and is taking ceftriaxone. A therapeutic effect of the medication would be a decreased respiratory rate. Bacterial pneumonia is characterized by inflammation and infection of the lungs, leading to symptoms such as cough and difficulty breathing. Ceftriaxone is an antibiotic that targets the bacteria causing the pneumonia, reducing the infection and inflammation and improving respiratory function.