The first two ingredients aren't too much of a problem; however, we don't typically recommend Gentamin Sulfate if there's a perforated eardrum.
It would be highly unlikely that a puppy this age would have an eardrum that wasn't intact, but I just wanted to mention it to be thorough.
If this were my own personal dog or my case, I'd use this product if an ear infection were present. 1-2 drops twice a day for 5-7 days (or a little longer, if necessary).
If the ear becomes red or more irritated or if a head tilt develops, then the drops should be discontinued immediately.
I should point out that it's illegal for me to suggest the use of a product for a patient for whom it wasn't prescribed (even those involving canine patients), but I can provide information about the product which is what I have done.
I would also gently clean the ear(s) out once a day with a 50/50 white vinegar/water solution if you don't have a specific ear cleaner designed for the job.
I hope this helps and that Bo's ear issue resolves quickly. Deb