Is Fentanyl An Opiate?

Yes it is an opiate, given for severe pain, shows up in urine tests.  I don't know how long it remains in your urine, however

Hello, fentanyls are synthetic opioids that are used in medicine as an anesthetic, as well as strong painkillers, for example, for cancer patients. Currently, fentanyl for sale can only be found in specialized pharmacies and only by prescription.

Yes Fentanyl is an opiate.