Will bactrim (sulfamethoxazole and trimethoprim) clear up a ear infection?

Probably: Bacterium is effective against many bacteria that can cause infection of ear canal or middle ear.

Ear infection-Bactri: Yes- if the infection is caused by a bacteria, Bactrim (sulfamethoxazole and trimethoprim) should clear it up.

Sometimes: It is not a first line choice for that purpose but it may work. The susceptibility of germs to this antibiotic varies.