On a regular basis, hydrogen peroxide is prescribed 5% in combination with Ciloxan ear drops. This means that it is an ear-perforation. After mutual consultation with a colleague Rees

A normal concentration is 3% (i.e. Perhydrol 10 X diluted) stabilized with 20mg phenacetine per 100ml. So 5% is higher but not dangerous anyway.

at Ciloxan, according to the text below, it can both be about otitis externa and media.

Ciloxan is also indicated in localized or diffuse otitis externa which is accompanied by a severe inflammatory reaction and whose germs are susceptible to ciprofloxacin, as well as to the acute surge of chronic otitis media. The perforated eardrum has a muco purulent secrete.

In The case of otitis externa, 5% hydrogen peroxide will certainly not pose a problem.

the scarce data available to me nevertheless raises the question whether the Quinolone is compatible with H2O2.