Dave,
My daughter is also allergic to penicillin, and there was some other form that a doctor tried on her when she was sick. If I recall right, its not the penicillin itself, but the dye used. I hope I'm not talking out my ass here and I'll double check with my wife, she remembers this stuff a lot better. I'd still check with a lawyer as if you have a reaction to it, you want legal action immediately.

Glad you're feeling better from the tooth aches though.