(generic for Norco). Norco is a powerful narcotic painkiller. It is similar to Vicodin but is stronger. Vicodin contains 5 milligrams of narcotic (hydrocodone) and 500 milligrams of Tylenol. Norco contains 10 milligrams of narcotic (hydrocodone) and 325 milligrams of Tylenol.You cannot drink or drive within six hours of using this drug. It is very addictive but is a very good pain pill.Use it in moderation. You can use it with non-steroidals and with muscle relaxants.t is similar to Vicodin but is stronger. Vicodin contains 5 milligrams of narcotic (hydrocodone) and 500 milligrams of Tylenol. Norco contains 10 milligrams of narcotic (hydrocodone) and 325 milligrams of Tylenol.