Question: how long should you wait before taking tylenol again?
Answer: For example, the instructions could say: “Adults and teenagers—650 to 1000 milligrams (mg) every 4 to 6 hours as needed.” This DOES NOT mean that you can take 1000 mg every 4 hours! Because the maximum dose for an adult is 4 grams per day, you can take either 650 mg every 4 hours or 1000 mg every 6 hours.