Fentanyl is a synthetic opioid 50 to 100 times more potent than morphine. This 50mcg transdermal patch releases fentanyl steadily over several days for long-term pain relief. It is typically used for patients with cancer or severe chronic pain. Fentanyl works by binding to the opioid receptors in the brain, altering the body’s pain perception. Due to its potency, it carries a high risk of overdose, especially if misused or used in combination with other substances. Side effects may include drowsiness, nausea, and breathing difficulties. It must be used under strict medical supervision.