You would probably have more side effects from whatever you’re being treated for than the antibiotics. What are they for? They cover a broad spectrum. Another risk, in addition to what was posted above, is C. Diff colitis, a condition which occurs when the antibiotics kill the good bugs in your gut as well as the stuff they are meant to kill.
Yes, that’s true. The combo can still give you C diff colitis - I actually don’t think that any antibiotic is completely free of the complication. Cecil’s says that there are Flagyl resistant C diff around. Don’t tell anyone I’m looking in an internal medicine text, though.