Background: Acute febrile illness has various etiologies. Different antimicrobials are used for different causes of fever to treat and there are interpersonal variations in prescription of antimicrobials. Therefore this study aims at to analyze the trends in the antimicrobial prescription in patients of acute febrile illness due to various etiologies in the medicine department of a tertiary care hospital.Methods: It is a record based observational study that was carried out at NKP salve institute of medical sciences and RC, Nagpur. 200 case record files of patients admitted with a diagnosis of acute febrile illness in the dept. of Medicine due to various etiologies were analyzed. Antibiotics prescribed for various causes of acute febrile illness like respiratory tract infections, urinary tract infection, gastrointestinal infection, malarial infections, septicemia, meningitis, pyrexia of unknown origin etc. were noted and data was analyzed for prescription pattern of antimicrobials.Results: Out of 200 patients of febrile illness the common clinical conditions for which antibiotics were prescribed were respiratory tract infections (upper respiratory tract infection 25.5% and lower respiratory tract infection 14%), acute gastroenteritis (20%), and urinary tract infection (13.5%) followed by, pyrexia of unknown origin (8.5%), viral fever (8%), malaria (7%), hepatitis A (1.5%), meningitis (1%) and rickettsial infection (1%). The commonly prescribed antibiotics were ceftriaxone in (19.37%) and cefixime (15.93%) followed by coamoxiclav (12.5%), azithromycin (11.87%), doxycycline (10.31%), ofloxacin and ornidazole (8.43%), levofloxacin (6.25%), ofloxacin (4.68%), ciprofloxacin (1.87%), artesunate (3.75%), artemether and lumefantrine (4.37%) and valacyclovir (0.625%).Conclusions: Our study concluded that most common disease for which antibiotics prescribed were respiratory tract infection and gasterointestinal infections. Most common antibiotic used were third generation cephalosporins especially ceftriaxone and cefixime.