What is the difference between coated and uncoated Tylenol?

The difference between coated and uncoated Tylenol is if the pill has a plastic coating or not. If the Tylenol had a smooth plastic coating on the outside of the pill it is said to be coated. If it just a pill and has no plastic cover on the pill it is said to be uncoated.

Other then the feel and look of the pill there is no different between the pill. However, most commonly coated pills take longer to dissolve in the stomach acid and take longer to "activate". Uncoated pills, once in the stomach, begin to dissolve and began to activate.