Experienced distorted vision, extreme drowsyness, dizziness. Seemed to work on tension headaches, but I was sleeping it off most of the time. Works well if you don't have anything to do with your day but lay down. I have stopped taking my morning dosage in order to be able to drive and function at work. Having a severe headache is still more functional than sleeping half the day off. The dosage was one pill three times a day as needed. This was in combination with Vioxx (anti-inflamatory/ pain reliever) once a day.