A silent epidemic, the Fentanyl crisis in the US is claiming thousands of lives due to the overdose of a deadly drug. Fentanyl is a synthetic opioid that was introduced in 1959 only for medical purposes. Its chief use is to alleviate excessive pain due to surgery, working as an analgesic (pain relief) and anaesthetic drug only under clinical guidelines. The purpose of the drug was to stand the excessive pain due to surgeries and produce a sensation of relaxation, pain relief, and sedation....