Hi, My Father 54 Years Old Approx . Last 15

Hi, my father 54 years old approx . last 15 day he has suffered from fever . According to blood test TLC is count 17 to 20 thousand and doctor gives monocef 2 mg Inj. and other medicina clarinova 500 etc. but in 24 hrs. fever come back aging. plz advice me what we do.