A nurse is caring for a client who is receiving penicillin G via intermittent IV piggyback. Which of the following actions should the nurse take?

A. Penicillin G is not related to sulfa drugs, so checking for a sulfa allergy is not necessary. The nurse should, however, assess for penicillin allergies. B. Diarrhea can indicate an adverse reaction such as antibiotic-associated colitis (e.g., Clostridium difficile infection), so the client should be instructed to report this symptom. C. Penicillin G is typically infused over 30 to 60 minutes, not 10 minutes. Infusing it too quickly could increase the risk of side effects. D. Penicillin G should be stored according to the manufacturer's instructions, but refrigeration is not always necessary. The nurse should check the specific instructions.