Is Tylenol 3 addictive

No Tylenol PM is not addictive. I assume you are taking it to help you sleep instead of for pain? If so, consider just taking an over the counter sleep aid instead. Diphenhydramine is the sleep ingredient in Tylenol PM, so if Tylenol PM works well for you, look for a sleep aid with the same ingredient (Nytol, etc)