acne medical cleanser

My son was prescribed Benzyol Peroxide 8.5% cleanser (Brand name Zodern Cleanser 8.5% ML BRA) The original prescription was filled, but now we are told we must us a OTC equivalent. I have searched the web and cannot find one. Is there an equivalent for Benzyol Peroxide 8.5% cleanser?

Thanks,

Pat Gudette