There is a fast acting Tylenol out there. Check the label.
Keep in mind a fever is your body’s natural defense to intruders. Many viruses are killed off by an elevated temperature. If you take a fever reducer your fighting against your body’s natural reaction. A high temp. (102+)happens when you’re dehydrated. Water absorbs and transfers heat, keep hydrated and lay off the aspirin and other fever reducers.
People where I live have stripped off all the shelves of Tylenol and other flue medications.