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 Long-term or repeated use of polymyxin b sulfate may cause a second infection. Tell your doctor if signs of a second infection occur. Your medicine may need to be changed to treat this.  Lab tests, including kidney function, may be performed to monitor your progress or to check for side effects.