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Fentanyl is abbreviated as FYL. Despite its popularity, fentanyl is becoming increasingly abused as it is used to treat severe pain. In order to increase its potency and to lower the cost for dealers, it is often mixed with Heroin. Fentanyl-related overdose deaths have risen dramatically as a result of this trend. Fentanyl is 100 times stronger than morphine. Morphine is 100 times less powerful than fentanyl. The effects of 13-panel drug test cup with FYL are rapid and short-lived. Fentanyl withdrawal is more severe than heroin withdrawal. The use of fentanyl can be hence detected for more than 3 days of drug test for the fentanyl. Transdermal Fentanyl patches are often prescribed to cancer patients for pain management due to the extended blood stream release of the drug. Fentanyl patches contain 25-100 micrograms of fentanyl per hour. Brand names include Duragesic, Abstral, and Subsys. Fentanyl: a dangerous drug There is a very small difference between a therapeutic level of