A patient who has been taking the antibiotic, penicillin to treat a strep infection for five days. This patient presents to the clinic reporting abdominal cramping and multiple episodes of watery diarrhea for the last 2 days. The patient also reports a single episode of diarrhea with small amounts of blood. What is the nurse's best response?

A. “I will speak to the doctor about a prescription for loperamide to help ease the diarrhea while you complete your antibiotics.": Using antidiarrheal medications like loperamide can worsen antibiotic-associated colitis if the diarrhea is due to Clostridioides difficile infection. Symptom management without addressing the underlying cause is unsafe. B. "You need to stop taking the medication immediately. The doctor will prescribe a different antibiotic to treat your new symptoms.": Watery diarrhea with abdominal cramping and blood after several days of antibiotic use suggests possible C. difficile infection, a serious complication. Immediate discontinuation of the offending antibiotic and notifying the healthcare provider is essential for patient safety and treatment of the infection. C. "GI symptoms are expected side effects when taking antibiotics. Start taking the medication with food to minimize this and follow up in two days.": While mild GI upset can occur with antibiotics, the presence of blood in the stool, prolonged diarrhea, and cramping indicates a potentially serious complication rather than a routine side effect. D. "This sounds like an allergic reaction. Take some diphenhydramine and follow up in two days.": Allergic reactions to penicillin typically present with rash, hives, or anaphylaxis, not bloody diarrhea. Treating with diphenhydramine would not address the gastrointestinal complication and could delay appropriate care.