Auroto Ear Drops Solution Uses Auroto Ear Drops are indicated for the treatment of Otitis externa associated with bacteria, fungi and ear mites in dogs and cats. Mode of action: Thiabendazole has acaricidal and fungicidal activity and is effective against Otodectes cynotis. Neomycin Sulphate is a broad spectrum antibiotic which is particularly effective against Pseudomonas aeruginosa, Staphylococcus aureus, Proteus vulgaris and some Streptococci. Tetracaine Hydrochloride is an effective topical local anaesthetic.