Tylenol PM Extra Strength. 24 Caplets - Experience relief from minor aches and pains while promoting restful sleep with TYLENOL PM Extra Strength. Formulated with 500mg of Acetaminophen and 25mg of Diphenhydramine HCl, this nighttime pain reliever and sleep aid is non-habit forming when used as directed. Enjoy the benefits of a restful night's sleep without worrying about dependency.