I've taken it for a few years, not had any real problems, I occasionally feel a little dizzy if I stand up too quickly, but as RAF says, a niggly cough can be a side effect, if you have this, don't suffer in silence but ask GP to change it. GP will probably want to see you after a month on it to see if your BP has gone down sufficiently, if not they may raise the dosage, and will probably want to do a blood test after a month as well to check kidney function is OK. If your dose goes up then GP will probably want to do a blood test again re:kidney function.