“…other pharmacological agents have been used with varying degrees of suc cess as alternatives. These agents include labetolol [33], bretylium tosylate [34], clonidine [35], and prazocin [36], In the author's prac tice, intravenous regional sympathetic block of the upper extremity is performed with labetolol 10 mg, 0.125% bupivacaine, 25 ml, hep arin 500 IU, and hydrocortisone 100 mg. All doses are doubled for Bier blocks of the lower extremity. These blocks are also effective in patients with sympathetically medicated pain and "post-surgical sympathectomy escape' in whom stellate ganglion blocks have been inef fective.…”