Hello Thank you for trusting HCM Dear elderly patients take more time to recover from diarrhea compared to young. Why because elderly people multivitamin deficiency is there low acid production, Decresed enzymes, atrophic gastritis etc... Decresed immunity delayed anti body production, delay mucosa recovery time. Use tab. Oflox Ornidazole 200 mg twice a day for 5days, cap. Gut OK twice in a day, use tab loperamide if severe diarrhea. Replace the fluid loss through ors. Check for electrolyte imbalances, renal function. If symptoms not improved consult your doctor. I think I answered to your question if you have more questions please feel free to ask.