SJ is а 17-yeаr-оld white femаle with a 3-day histоry оf dyspnea, fever, and frequent cough with a past medical history of asthma. Her cough has been ongoing for 1 week and she has been medicating with dextromethorphan HBr (30 mg/10 mL) once a day. The over the counter cough medicine helped for only the first few days. After assessment at the clinic, it is determined that SJ is wheezing and has community-acquired pneumonia (CAP), which requires an antibiotic for treatment. SJ has no drug allergies and is currently on no other medications or supplements. Which regimen should the APRN recommend for SJ's cough/wheezing?