TYLENOL Proactive Support* Muscle & Joint TYLENOL Is Tylenol safe during pregnancy? , The answer isnt yes or noit depends on YOUR body. , Tylenol (acetaminophen) has been used since 1955 and became routine in pregnancy by the 1980sthe same era A quantum chemical study of the reactivity of acetaminophen (paracetamol) toxic metabolite N acetyl p benzoquinone imine with deoxyguanosine and glutathione ScienceDirect Frontiers MitochondrialLysosomal Axis in Acetaminophen Hepatotoxicity Here's how to make Tylenol work way better Dose it correctly: 1,000 mg at a time, spaced every 8 hours. Smaller doses don't control pain as well. Take it