ACE Inhibitors are pretty safe for most people who take them.
However for some people the ACE Inhibitors can be dangerous to their health especially when taken long term.
Some serious health issues that can occur from taking ACE Inhibitors long term or even for a short while can be Kidney disease, kidney failure, Allergic Reactions as well as Pancreatitis.
Yes taking ACE Inhibitors can lead to Pancreatitis as well as the Kidney Failure, Kidney Disease and cause other Allergic Reactions.
So if you already suffer from Pancreatitis or have kidney disease or kidney failure then you should not take ACE Inhibitors unless your doctor says it's okay.
But as long as the person taking the ACE Inhibitors is pretty healthy overall other than needing the ACE Inhibitors then it's pretty safe to take ACE Inhibitors.