Drug Information for Bacitracin Zinc and Polymyxin B Sulfate Ophthalmic Ointment USP (Sterile) (Bausch & Lomb Incorporated): DESCRIPTION:

Bacitracin Zinc and Polymyxin B Sulfate Ophthalmic Ointment USP is a sterile antimicrobial ointment formulated for ophthalmic use.

Bacitracin zinc is the zinc salt of bacitracin, a mixture of related cyclic polypeptides (mainly bacitracin A) produced by the growth of an organism of the licheniformis group of Bacillus subtilis var Tracy. It has a potency of not less than 40 bacitracin units per mg. The structural formula for bacitracin A is:

Polymyxin B sulfate is the sulfate salt of polymyxin B₁ and B₂ which are produced by the growth of Bacillus polymyxa (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 formulae are:

Each Gram Contains: ACTIVES: Bacitracin Zinc equal to 500 bacitracin units and Polymyxin B Sulfate equal to 10,000 polymyxin B units; INACTIVES: White Petrolatum and Mineral Oil.