Well if shit really has hit the proverbial fan and you are fighting an infection, and that's all that's left.... your telling me that you wouldn't give it a shot????? Really. That's basically all I was say'n. I wasn't say'n that if tomorrow I pop a staph infection, I would run to Petco and pull this crap off the shelf. Besides in reality most adults know by now if they are allergic to Penicillin or not.