 [ Symptoms ] i accidently overdosed on tylenol by taking 21 in a 12 hour period it is a few days later and i have no symptoms i do not know what is should do this was regular strength 325 mg tylenol it is 4 days later the only symptom i have is upper right abdominal pain any thoughts thanks [ Disease ] rose did you ever go to the doctor all i can think of for you to do days later since the tylenol has already been adsorbed would be to have lab work drawn to see if there was any damage to the kidneys or liver otherwise i am not really sure i hope you are ok at this point