Background: Antimicrobial agents constitute a major proportion of inpatient drug utilization and healthcare expenditure in tertiary care hospitals. Inappropriate empirical prescribing contributes to increased costs and antimicrobial resistance. This study aimed to evaluate the cost-effectiveness of commonly prescribed antimicrobial agents in a tertiary care center.
Methods: A prospective observational pharmacoeconomic study was conducted among 138 inpatients receiving systemic antimicrobial therapy. Clinical outcomes, drug costs, length of stay (LOS), and total hospitalization costs were recorded. Cost-effectiveness was assessed using cost per successfully treated patient. Comparative analysis was performed using Chi-square test and one-way ANOVA.
Results: Empirical therapy was initiated in 66.7% of patients. Cure rates across commonly prescribed antimicrobials were comparable (p = 0.71). However, significant differences were observed in drug cost, LOS, and total hospital cost (p < 0.001). Meropenem had the highest cost per successfully treated patient (₹43,851 ± 12,006), whereas amoxicillin–clavulanate demonstrated the lowest (₹15,659 ± 4,637). Culture-guided therapy showed significantly lower drug cost (p = 0.003), reduced LOS (p = 0.01), higher cure rate (p = 0.048), and lower cost per successful treatment (p = 0.004) compared to empirical therapy.
Conclusion: Culture-guided antimicrobial therapy is more cost-effective than empirical treatment. Broad-spectrum antibiotics increase hospitalization costs without significant improvement in outcomes. Incorporation of pharmacoeconomic principles into antimicrobial stewardship programs can enhance both clinical effectiveness and economic efficiency.