Norco is a painkiller used for treating moderate to severe pain. It contains 2 chemicals hydrocodone (an opioid reliever) and acetaminophen (non opioid reliever). You can buy Norco online according to your pain, as it comes with different dosages like 5-325 mg, 7.5-325 mg, and 10-325 mg depending on the intensity of the pain. It acts on the central nervous system by changing the way of reaction to the pain. After consuming this tablet we can not feel the pain like before due to this mechanism.