Q. I have a history of sleeping problems. I just started taking half an acetaminophen PM tablet (1/4 the adult dose) just before bed. This allows me to sleep through the night. Is this safe?
A. If pain is not an issue, you don’t need the acetaminophen. The PM part of the pill is diphenhydramine (DPH). This is the antihistamine found in Benadryl and it makes people drowsy. At the dose you are using, there should be few, if any, side effects.