['Inosine pranobex (Isoprinosine®) is an immunomodulatory drug approved in several countries for the treatment of viral infections. This study compared the efficacy and safety of inosine pranobex versus placebo in subjects with clinically diagnosed influenza-like illness, including subjects with laboratory-confirmed acute respiratory viral infections. Subgroup analyses evaluated the efficacy of inosine pranobex compared to placebo in otherwise healthy (without related ongoing disease) subjects that were less than 50\xa0years of age and healthy subjects that were at least 50\xa0years of age. The effect of body mass index (BMI) was evaluated in subjects less than 50\xa0years of age.', 'A total of 463 subjects were randomly assigned to receive inosine pranobex (n\u2009=\u2009231) or placebo (n\u2009=\u2009232) in this Phase 4, randomised, double-blind, multicentre study. The primary efficacy endpoint was time to resolution of all influenza-like symptoms present at baseline to none. Safety was evaluated through analysis of adverse events, vital signs, and physical examinations.', 'The difference in time to resolution of all influenza-like symptoms between treatment groups was not statistically significant but showed a faster improvement in subjects in the inosine pranobex group versus those in the placebo group - Hazard Ratio\u2009=\u20091.175; (95\xa0% CI: 0.806-1.714). P-value\u2009=\u20090.324. In the subgroup analysis for subjects less than 50\xa0years of age, statistically significant differences in time to resolution of influenza-like symptoms that favoured the inosine pranobex group over the placebo group were observed in those without related ongoing disease and those who were non-obese (BMI <30\xa0kg/m'] Is inosine pranobex safe and effective for the treatment of subjects with confirmed acute respiratory viral infections : analysis and subgroup analysis from a Phase 4 , randomised , placebo-controlled , double-blind study?