Hi. It's an alpha blocker used to lower bp and improve renal function. Were you started on this? I know when I started blood pressure medication that admittedly was a different class but this is common, I initially had side effects of a burning chest and chest pain. My doctor said that lasts about a week or so. It did get better and my bp lowered by almost 30 points. I think with this medication you are on, you can get stomach aches and they say to drink a glass of milk with it. ?? And light headeadedness. I found I did get dizzy and light headed while adjusting to my medication but it got better. I've noticed though that I need to stay very well hydrated when taking bp medication. Anyway, tell us what is going on and what you have a question about and we'll see if we can help. https://www.webmd.com/drugs/2/drug-8695/prazosin-oral/details