Actually Lortab is a Brand name tablet that generally comes with 500mg of Tylenol...They are availiable in 5/500, 7.5/500, and 10/500....the active ingredients are the same....Hydrocodone is a narcotic analgesic that binds to opiate receptors in the brain and spinal cord, Acetaminophen is a non-narcotic analgesic that blocks the production of prostaglandins which helps to relieve pain. So Norco is only different in the fact that it has a lower concentration of Tylenol which is better for the liver as oral medications are processed in the liver and go into the bloodstream through that method, they say that APAP is terrible for the liver and the max dose is 4000mg per day or 4g per day.... Baswan was correct in his information just thought I would surmise it with a definate answer to the difference between Norco and Lortab.....it is just that...they are different names with the same ingredients and availiable in different concentrations of Tylenol...the concentration of Hydrocodone is exactly the same in both...5, 7.5, and 10...Hope this helps...

Just wanted to add....I am a RPh and I have not seen Lortab available in a 10/650...that is usually called Lorcet...All of these names are really useless as far as I am concerned...The only benefit of the extra Tylenol is that it potentiates the effect of the Narcotic, making it work better in effect....