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(brinzolamide/brimonidine tartrate) Ophthalmic Suspension


SIMBRINZA™ (brinzolamide/brimonidine tartrate ophthalmic suspension) 1%/0.2% is a fixed combination of a carbonic anhydrase inhibitor and an alpha 2 adrenergic receptor agonist.

Brinzolamide is described chemically as: (R)-(+)-4-Ethylamino-2-(3-methoxypropyl)-3,4dihydro-2H-thieno [3,2-e]-1,2-thiazine-6-sulfonamide-1,1- dioxide. Its empirical formula is C12H21N3O5S3, and its structural formula is:

Brinzolamide Structural Formula Illustration

Brinzolamide has a molecular weight of 383.5. It is a white powder, which is insoluble in water, very soluble in methanol and soluble in ethanol.

Brimonidine tartrate is described chemically as: 5-bromo-6-(2-imidazolidinylideneamino) quinoxaline L-tartrate. Its empirical formula of C11H10BrN5 – C4H6O6 and its structural formula is:

Brimonidine tartrate Structural Formula Illustration

Brimonidine tartrate has a molecular weight of 442.2. It is a white to yellow powder that is soluble in water (34 mg/mL) at pH 6.5.

SIMBRINZA™ (brinzolamide/brimonidine tartrate ophthalmic suspension) 1%/0.2% is supplied as a sterile, aqueous suspension which has been formulated to be readily suspended following shaking. It has a pH of approximately 6.5 and an osmolality of approximately 270 mOsm/kg.

Each mL of SIMBRINZA™ (brinzolamide/brimonidine tartrate ophthalmic suspension) 1%/0.2% contains: Active ingredients: brinzolamide 10 mg, brimonidine tartrate 2 mg (equivalent to 1.32 mg as brimonidine free base); Preservative: benzalkonium chloride 0.03 mg; Inactive ingredients: propylene glycol, carbomer 974P, boric acid, mannitol, sodium chloride, tyloxapol and purified water. Hydrochloric acid and/or sodium hydroxide may be added to adjust pH.

Last reviewed on RxList: 5/3/2013
This monograph has been modified to include the generic and brand name in many instances.

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