Hey Nullific, diphenhydramine is a antihistamine plain and simple. It causes a tired and sleepy feeling. I take 2 before going to bed. It is used in MANY sleeping aids and is what is in the PM OVER THE COUNTER DRUGS! Before you try to sound like you know something check the facts.Your trying to compare them to Angels Trumpet or Datura is about the most ignorant thing I have read on these boards.
nutranater Reviewed by nutranater on . Diphenhydramine Pseudophedrine and DXM My mom just went to the pharmacy and got dextromethorphan, Diphenhydramine, and pseudophedrine for my cough. I was wondering what a good first time dose of Diphenhydramine is. What is a pseudophedrine dose for first timers(not ephedrine)? And also is grapefruit juice effective with DXM like people say because I only have 400mg and I feel like a high 3rd plateu dose. Rating: 5