Hydrocodone is a man-made opioid that comes from codeine. It is often used with acetaminophen to help manage moderate to severe pain. For those looking for pain relief, buy hydrocodone online that can be a convenient choice. In the past, hydrocodone was also used as a cough medicine, but now it’s mostly replaced by dextromethorphan in cough and cold products. A stronger version of hydrocodone, called hydromorphone, is also commonly used for severe pain.