Oooo gosh, no I haven't, I hope someone here has used it. I do feel for you, I get very anxious if my pets (babies) need medication - as they aren't able to tell you if they are feeling odd or having side effects. Its only when it becomes really obvious that you know something isn't right. I have my own fear of medications and it transfers to the animals quite smoothly . I just did a quick search on this medication used in veterinary medicine, and yes, the three uses are blood pressure, congestive heart faliure and urethral spasms. Are you on any dog forums at all (sorry I'm not) where you could get a bit more information and some positive stories of its use?