Aspadol is a pain medication that contains opioids. A narcotic is another name for an opioid. Norepinephrine reuptake inhibitors like Aspadol 100mg Tablets are used to treat both mild and chronic pain. Aspadol decreases the perception of pain and the way that one responds to it. Tapentadol is one of the active ingredients of Aspadol pills. It is advised to use extended-release tapentadol to treat persistent pain that is resistant to over-the-counter analgesics. Common aspadol side effects include constipation, nausea, vomiting, stomach discomfort, headache, tiredness, sleepiness, and dizziness.