DRUG CLASS AND MECHANISM: Terazosin belongs to a class of medications called alpha 1 blockers which relaxes the smooth muscles of the arteries, the prostate, and the bladder neck. Other alpha blockers in the same class of drugs include doxazosin (Cardura), alfuzosin (Uroxatral), tamsulosin (Flomax), and prazosin (Minipress). Relaxing the smooth muscles of the arteries lowers blood pressure. Relaxing the smooth muscles around the bladder neck relieves urinary obstruction caused by an enlarged prostate (prostate hypertrophy)

this is what i know of hytrin's use ... for prostate enlargement. i never hear of it used for RSD! that is something i will have to google!!!
Joan

The involvement of other sympathetic midline connections and plexi such as celiac (abdominal pain, peptic ulcer, nausea, vomiting, and weight loss), superior and inferior mesenteric plexi (diarrhea, abdominal cramps, and weight loss), and cardiac plexus (chest pain, abnormal heart beat, tachycardia, and heart attack), and carotid and vertebral plexi (severe vascular headaches, dizziness, tinnitus, attacks of falling spells, and syncopal attacks), should be identified as such and should be treated with the help of Clonodine Patch, Hytrin, or Dibenzyline as well as proper treatment applied to the source of RSD (definitely avoiding ice, but encouraging exercise, moist heat, epsom salt and hot water, and newer antidepressants as the best analgesics of choice for RSD).

this is from Hooshman's RSD Puzzle #019 .... so there you go.