Polymyxin B Sulfate and Trimethoprim Ophthalmic Solution, USP Sterile

Polymyxin B Sulfate and Trimethoprim Ophthalmic Solution, USP is a sterile antimicrobial solution for topical ophthalmic use. It has pH of 4.0 to 6.2 and osmolality of 270 to 310 mOsm/kg.

Chemical Names:

Trimethoprim, 5-(3,4,5-Trimethoxybenzyl)pyrimidine-2,4-,diamine, is a white, odorless, crystalline powder with a molecular weight of 290.3 and the following structural formula:

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:

Contains: Actives: polymyxin B sulfate 10,000 units/mL; trimethoprim sulfate equivalent to trimethoprim 1 mg/mL. Preservative: benzalkonium chloride 0.04 mg/mL. Inactives: water for injection; sodium chloride; and sulfuric acid. May also contain sodium hydroxide to adjust the pH.

Trimethoprim is a synthetic antibacterial drug active against a wide variety of aerobic gram-positive and gram-negative ophthalmic pathogens. Trimethoprim blocks the production of tetrahydrofolic acid from dihydrofolic acid by binding to and reversibly inhibiting the enzyme dihydrofolate reductase. This binding is stronger for the bacterial enzyme than for the corresponding mammalian enzyme and therefore selectively interferes with bacterial biosynthesis of nucleic acids and proteins.

Polymyxin B, a cyclic lipopeptide antibiotic, is bactericidal for a variety of gram-negative organisms, especially Pseudomonas aeruginosa. It increases the permeability of the bacterial cell membrane by interacting with the phospholipid components of the membrane.

Blood samples were obtained from 11 human volunteers at 20 minutes, 1 hour and 3 hours following instillation in the eye of 2 drops of ophthalmic solution containing 1 mg trimethoprim and 10,000 units polymyxin B per mL. Peak serum concentrations were approximately 0.03 mcg/mL trimethoprim and 1 unit/mL polymyxin B.

Microbiology: In vitro studies have demonstrated that the anti-infective components of polymyxin B sulfate and trimethoprim are active against the following bacterial pathogens that are capable of causing external infections of the eye:

Trimethoprim: Staphylococcus aureus and Staphylococcus epidermidis, Streptococcus pyogenes, Streptococcus faecalis, Streptococcus pneumoniae, Haemophilus influenzae, Haemophilus aegyptius, Escherichia coli, Klebsiella pneumoniae, Proteus mirabilis (indole-negative), Proteus vulgaris (indole-positive), Enterobacter aerogenes and Serratia marcescens.

Polymyxin B: Pseudomonas aeruginosa, Escherichia coli, Klebsiella pneumoniae, Enterobacter aerogenes and Haemophilus influenzae.

Polymyxin B Sulfate and Trimethoprim Ophthalmic Solution, USP 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 Pseudomonas aeruginosa. ^*

^*Efficacy for this organism in this organ system was studied in fewer than 10 infections.

Polymyxin B Sulfate and Trimethoprim Ophthalmic Solution is contraindicated in patients with known hypersensitivity to any of its components.

NOT FOR INJECTION INTO THE EYE. If a sensitivity reaction to polymyxin B sulfate and trimethoprim ophthalmic solution occurs, discontinue use. Polymyxin B Sulfate and Trimethoprim Ophthalmic Solution is not indicated for the prophylaxis or treatment of ophthalmia neonatorum.

The most frequent adverse reaction to polymyxin B sulfate and trimethoprim ophthalmic solution is local irritation consisting of increased redness, burning, stinging, and/or itching. This may occur on instillation, within 48 hours, or at any time with extended use. There are also multiple reports of hypersensitivity reactions consisting of lid edema, itching, increased redness, tearing, and/or circumocular rash. Photosensitivity has been reported in patients taking oral trimethoprim.

To report SUSPECTED ADVERSE REACTIONS, contact Somerset Therapeutics, LLC at 1-800-417-9175 or FDA at 1-800-FDA-1088 or www.fda.gov/medwatch

In mild to moderate infections, instill one drop in the affected eye(s) every three hours (maximum of 6 doses per day) for a period of 7 to 10 days.

Polymyxin B Sulfate and Trimethoprim Ophthalmic Solution, USP is supplied sterile in natural low density polyethylene (LDPE) ophthalmic bottles and natural low density polyethylene (LDPE) nozzle with white high density polyethylene (HDPE) caps as follows:

10 mL in 10 mL bottle - NDC 70069-311-01

Note: Store at 15° to 25°C (59° to 77°F) and protect from light.

Rx only

For Product Inquiry call +1-800-417-9175

Revised: May, 2024

Manufactured for:

Somerset Therapeutics, LLC.

Somerset, NJ 08873

Made in India

Code No.: KR/DRUGS/KTK/28/289/97

ST-PST11/P/01

1200824

Container Label (10 mL)

Carton Label