My husband was about 25 and got a rocephin injection for an abscess. He now refuses to take anything with "in" at the end of it. I am far from an antibiotic guru, but how could he have went all his life and through his childhood and not had a reaction to oral penicillin? I know they aren't exactly the same, but they're close right? Is it possible to be allergic to rocephin only, and penicillin is okay? Sorry if this is silly, but very curious.