Yes, Cefalexin (cephalexin) can cause diarrhea as a common side effect. This antibiotic disrupts the natural gut flora, potentially leading to loose stools or diarrhea in some patients. Typically, this is mild and resolves after treatment ends, but in rare cases, it may signal a more serious condition like Clostridioides difficile infection. Staying hydrated and consulting a doctor if symptoms persist is advised. For comparison, ceftriaxone, another cephalosporin antibiotic, also lists diarrhea among its side effects. If sourcing ceftriaxone, ensure you choose a reputable ceftriaxone supplier to guarantee quality and efficacy. Always follow medical guidance when using antibiotics.