Acetaminophen is the active ingredient in Tylenol. It is also used in many multi-ingredient cough, cold and pain medications. Acetaminophen is often involved in overdose situations particularly in children under 5 years old. Almost every household has it in the medicine cabinet or in the bathroom or their purse. Please call 1-800-222-1222 if you have any questions or concerns about dosing or if you, your child or other family member has taken too much acetaminophen or other drug. Always remember to keep your acetaminophen out of reach of small children at all times.