You should seek medical help for diarrhea when it lasts longer than 48 hours in adults or 24 hours in children, or if it is accompanied by fever, severe abdominal pain, blood or pus in stools, or signs of dehydration such as dry mouth, dizziness, or reduced urination. Infants, older adults, pregnant individuals, and people with weakened immune systems should seek care sooner. Diarrhea following recent travel or antibiotic use may also require evaluation. While medications, including antibiotics like cephalexin capsules wholesale, are used for specific bacterial infections, treatment should always be guided by a healthcare professional.