My neighbor's son overdosed on this drug intentionally. He was depressed for some time and had suicidal tendencies. We heard that he took several of his mom's lisinopril tablets when his parents were out of town.
Thankfully, he called a friend at that time who called the cops and told them his address. He stayed at the emergency room that night, my husband went with him in the ambulance.
I think they gave him another medication to raise his blood pressure and had to observe him throughout the night so that his blood pressure wouldn't fall to dangerous levels. It must have been very scary for him.
When I saw him the next day, he looked very pale and tired but thankfully, he's okay now. It's a bad idea to keep these drugs lying around.