Association Between Antidiarrheal Drug Prescription and Return Visits Among Adult Patients With Acute Diarrhea.

Whether antidiarrheal medications have benefits or demerits when administered to adult patients with diarrhea remains controversial. We aimed to evaluate the association between antidiarrheal drug prescription and clinical outcomes in adult patients with acute diarrhea. This retrospective cohort study was conducted by collecting secondary data of patients' health records at St. Luke's International Hospital from April 1, 2004, to March 31, 2016. We included all participants aged 20-59 years who visited the division of general internal medicine or the emergency room in the hospital due to acute diarrheal symptoms. We excluded those who had chronic diarrhea or were immunocompromised (e.g., those with cancer or immunosuppressant usage). Our primary outcome was return visits within two weeks; the secondary outcome was admission to the hospital due to acute diarrhea within two weeks from the first visit. We compared the outcomes between patients with and without antidiarrheal drug prescriptions.  During the study period, a total of 10,246 patients were included, of which 204 (2.0%) were prescribed antidiarrheal drugs. The mean age of the patients was 35.0 (standard deviation: 10.7) years, and 4,130 (40.3%) were men. Patients who were prescribed antidiarrheal drugs were more likely to be prescribed antibiotics (p<0.01). The adjusted odds ratios for return visits among patients with and without antidiarrheal drug prescription were 1.24-1.59, which were not significant. We demonstrated that antidiarrheal drug prescription was not associated with return visits or hospital admission among adult patients with acute diarrhea. This finding suggests that antidiarrheal medications have more benefits than risks in adult patients with acute diarrhea.