Wow! What a great product! I am a migraine sufferer, but sometimes I just get what the doctor and I like to call "allergy migraines". This is when sinus pressure builds up inside your head and it can become extremely painful. One pill of this particular Benedryl stops the headache in its tracks by stopping the pressure. I am not sure how it works, but it is almost like it just disintegrates within about 30 minutes or less. It can make you slightly sleepy because of the Benedryl part, but most people with a headache are already lying down. The sleep is not a drug type of sleep, but...review »