The nasal cavity (or nasal fossa) is a large air filled space above and behind the nose in the middle of the face.Each cavity is the continuation of one of the two nostrils.he nasal cavity (or nasal fossa) is a large air filled space above and behind the nose in the middle of the face.
Polymyxin B sulfate and trimethoprim (Polytrim) is an antibacterial eye drop prescribed to treat bacterial conjunctiivitis and blepharoconjunctivitis of the eyes. Side effects, drug interactions, pregnancy safety, dosage, and storage information should be reivewed prior to using this medication.
1 To clear up your infection completely, use polymyxin b sulfate for the full course of treatment. Keep using it even if you feel better in a few days.  Keep this product, as well as syringes and needles, out of the reach of children and pets. Do not reuse needles, syringes, or other materials.