I think my main concern is the hospital only do a kidney function test 2 weeks after you start on ACE inhibitors. I asked my doctor how often it's checked and I think she said once a year. The concern is whether that is enough, because ACE inhibitors can have a slightly more serious side effects in that they can affect the kidneys.
The main side effect - I think the only side effect I've noticed - is that it gives me a ticklish throat particularly at night when I'm lying down, but to a certain extent, sometimes during the day as well.