Polymyxin B sulfate and trimethoprim ophthalmic solution is indicated in the treatment of surface ocular bacterial infections, including acute bacterial conjunctivitis, and blepharoconjunctivitis, caused by susceptible strains of the following microorganisms: Staphylococcus aureus, Staphylococcus epidermidis,Streptococcus pneumoniae, Streptococcus viridans, Haemophilus influenzae and Pseudomonasaeruginosa.**
**Efficacy for this organism in this organ system was studied in fewer than 10 infections.
Polymyxin B Sulfate and Trimethoprim Ophthalmic Solution USP* is a sterile antimicrobial solution for topical ophthalmic use. It has a pH of 4.0 to 6.2 and osmolality of 270 to 310 mOsm/kg. Trimethoprim sulfate, a white, odorless, crystalline powder, is represented by the following structural formula:
C28H38N8O10S Mol. Wt. 678.72
Chemical Name: Trimethoprim sulfate, 2,4-diamino-5-(3,4 5-trimethoxybenzyl)pyrimidine sulfate (2:1)
Polymyxin B sulfate is the sulfate salt of polymyxin B1 and B2 which are produced by the growth of Bacilluspolymyxa (Prazmowski) Migula (Fam. Bacillaceae) . It has a potency of not less than 6,000 polymyxin B units per mg, calculated on an anhydrous basis. The structural formula is:
Each mL Contains: ACTIVES: Polymyxin B Sulfate equal to 10,000 polymyxin B units, Trimethoprim Sulfate (equivalent to trimethoprim 1 mg); INACTIVES: Sodium Chloride, Purified Water. Sulfuric acid and, if necessary, sodium hydroxide may be added to adjust pH (4.0 – 6.2). PRESERVATIVE ADDED: Benzalkonium Chloride 0.004%.