Jonathan is 31 years old and presents with a 2 week history of fevers, myalgia, increased urinary frequency, dysuria and perineal pain. He denies any haematuria, urethral discharge, testicular pain or lumps.
On examination his temperature is 37.8 °C and rest of observations are unremarkable. Urine dipstick is positive for nitrites and leucocytes and abdominal examination is normal. Rectal examination reveals a tender, warm, swollen prostate and acute prostatitis is suspected.
What is the single most appropriate initial management option?