You should seek medical help for diarrhea if it lasts more than three days, is accompanied by high fever, severe abdominal pain, or signs of dehydration such as dizziness, dry mouth, or reduced urination. Bloody or black stools also require urgent attention, as they may indicate a serious infection or intestinal bleeding. Persistent diarrhea after antibiotic use, such as ceftriaxone injection treatment, should be reported to a doctor immediately. Always consult a healthcare provider before using antibiotics and obtain them only from verified ceftriaxone injection distributors to ensure safety, authenticity, and proper medical guidance for effective treatment.