new poster here, lurking the past week. Was prescribed the nitro. I get headaches almost instantly. No light headedness. I try to take advil a half hour before to combat it. Headaches have lasted anywhere from 10 to 30 minutes or so. Sometimes they do pound, especially if I try to move around much. On day 4 of it here, twice a day. Can't say that I think it does much of anything for me, but who knows... supposed to be on it at least a week before noticing any results. For me the stool softeners seem to have been the best route. and I think the Lidocaine has helped as well.