A transdermal analgesic or pain relief patch is a medicated adhesive patch used to relieve minor to severe pain. There are many types of analgesic patches based on the main ingredients in the patches. These include patches containing counterirritants, which are used to treat mild to moderate pain, and patches containing opioids such as buprenorphine and fentanyl, used to relieve moderate to severe pain. Fentanyl is often used for opioid-tolerant patients. Nitroglycerin, also known as glyceryl trinitrate (GTN), a medication used for heart failure, high blood pressure, anal fissures, painful periods, and to treat and prevent chest pain, can also be found in patches. Beyond these are patches that contain drugs such as diclofenac and lidocaine and various other drugs. The main purpose of transdermal analgesic patches are to administer drugs in a more viable way to patients, as opposed to oral consumption or intravenous administration such as an injection.[1]