That's the drug company line. That's what they always say: they save a lot of lives. They can't prove it, but they say it, so I've heard it a lot.
I knew Sara Carlin, who in 2007 started taking Paxil, reacted to it, and started taking drugs, which is part of the abnormal behaviour listed right on the label of the drug. She quit her hockey team, quit university, and got into cocaine. One night she came home at two o'clock after a drinking bout and hanged herself in her parents' house. There was no doubt that Paxil was the contributing factor. In fact, right on the label it says that Paxil might cause suicidal ideation.