Neomycin and Polymyxin B Sulfates
and Dexamethasone Ophthalmic
Suspension
Sterile
DESCRIPTION
Neomycin and polymyxin B sulfates and dexamethasone ophthalmic suspension is a multiple dose anti-infective steroid combination in sterile suspension form for topical application. The chemical structure for the active ingredient, dexamethasone, is:
Established Name:
dexamethasone
Chemical Name:
pregna-1, 4-diene-3, 20-dione, 9-fluoro-11,17, 21-trihydroxy-16-methyl-, (11β, 16α)-.
The other active ingredients are neomycin sulfate and polymyxin B sulfate.
Each mL contains: Actives: neomycin sulfate equivalent to neomycin 3.5 mg, polymyxin B sulfate 10,000 units, dexamethasone 0.1%. Preservative: benzalkonium chloride 0.004%. Vehicle: hypromellose 2910 0.5%. Inactives: sodium chloride, polysorbate 20, hydrochloric acid and/or sodium hydroxide (to adjust pH), purified water.
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CLINICAL PHARMACOLOGY
Corticosteroids suppress the inflammatory response to a variety of agents and they probably delay or slow healing. Since corticosteroids may inhibit the body’s defense mechanism against infection, a concomitant antimicrobial drug may be used when this inhibition is considered to be clinically significant in a particular case.
When a decision to administer both a corticosteroid and an antimicrobial is made, the administration of such drugs in combination has the advantage of greater patient compliance and convenience, with the added assurance that the appropriate dosage of both drugs is administered, plus assured compatibility of ingredients when both types of drugs are in the same formulation and, particularly, that the correct volume of drug is delivered and retained.
The relative potency of corticosteroids depends on the molecular structure, concentration and release from the vehicle.
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