### Human:\ni was given fentanyl to treat my flu symptoms in the e. r. is this common or reasonable flu treatment?\n\n### Assistant: very odd. fentanyl is not used to treat influenza. it is a pain medication. can't say that i ever heard of a medical professional recommending this level of pain control for plain 'ol influenza. no fentanyl is not a common treatment advised for flu. it is a pain relieving medication. please check with your doctor.