I'm trying to recall the name of a medication?

It was a prescription allergy medication first appearing I think in the 80s. Though it was only recommended for adults, some doctor prescribed it to a kid, and he ended up with heart problems and died very quickly. After that, it was on TV, I want to say I recall it on 60 minutes and they said a group of people got heart problems or couldn't sleep after using it. I think it started with a P (could be way off) and it was one of the very earliest non-drowsy antihistamines. Someone once told me they thought allegra was this medication re-engineered to remove the side effects, but I can't seem to confirm this. Before they modified google, I was able to find the name by searching for antihistamine that caused heart problems that killed a kid, but it doesn't work now. This came up in conversation with a friend, and now it is driving us nuts we can't either one of us recall the name.

Thanks!