Fentanyl is a powerful synthetic opiate analgesic similar to morphine but is 50 to 100 times more potent. It is typically used to treat patients with severe pain or to manage pain after surgery and or to treat people with chronic pain who are physically tolerant to opiates. Synthetic opioids, including fentanyl, are now the most common drugs involved in drug overdose deaths in the United States. A person can test positive for fentanyl on a urine test for 24 - 72 hours after last use and 5 and 48 hours in blood, depending on the dose. Hair tests can detect the drug for up to 3 months. Screening assays are generally qualitative and based on competitive ELISAs using urine, saliva, blood, or breast milk samples.
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