But if the treatment appears to cause severe mood swings in some cases, would that not suggest there's a good chance that it was a factor in the two suicide attempts (one successful)? Or is it counterintuitive?
For example, Isotretinoin https://en.wikipedia.org/wiki/Isotretinoin (known as Accutane/Roaccutane and by other names) is also associated with depression and suicidal behavior. It's still a popular drug used to treat acne, even though that is not a particulary dangerous disease.
I don't know anything about how the pharma industry works, but I'd guess they'll restart the trial, taking depression into account and watching for signs among the participants. And maybe with a lower dosage?