A Patient Is Taking Dicloxacillin (Dynapen)500 Mg Every 6 Hours

A patient is taking dicloxacillin (Dynapen) 500 mg every 6 hours to treat a severe penicillinase-resistant infection.At a 1-week follow-up appointment,the patient reports nausea,vomiting,and epigastric discomfort.The primary care NP should:

A) change the medication to a cephalosporin.
B) decrease the dose to 250 mg every 6 hours.
C) reassure the patient that these are normal adverse effects of this drug.
D) order blood cultures, a white blood cell (WBC) count with differential, and liver function tests (LFTs) .