SPL Set ID: 72b0d0ec-832a-4c25-b845-2537ab506354

Timolol GFS (timolol maleate ophthalmic gel forming solution) is a non-selective beta-adrenergic receptor inhibitor. Its chemical name is (-)-1-( tert -butylamino)-3-[(4-morpholino-1,2,5-thia diazol-3-yl)oxy]-2-propanol maleate (1:1) (salt). Timolol maleate possesses an asymmetric carbon atom in its structure and is provided at the levo-isomer. The nominal optical rotation of timolol maleate is: [α] 25° in 0.1N HCl (C=5%) = -12.2° 405 nm Its molecular formula is C 13 H 24 N 4 O 3 S·C 4 H 4 O 4 and its structural formula is: Timolol maleate has a molecular weight of 432.50. It is a white, odorless, crystalline powder which is soluble in water, methanol, and alcohol. Timolol GFS is a colorless to nearly colorless, slightly opalescent, and slightly viscous, is supplied as a sterile, isotonic, buffered, aqueous topical ophthalmic solution of timolol maleate in two dosage strengths. Timolol GFS has a pH of approximately 6.9 and an osmolality of approximately 290 mOsmol/kg. Each mL of Timolol GFS 0.25% contains 2.5 mg of timolol (3.4 mg of timolol maleate). Each mL of Timolol GFS 0.5% contains 5 mg of timolol (6.8 mg of timolol maleate). Inactive ingredients: boric acid, mannitol, polysorbate-80, tromethamine, xanthan gum, and purified water. Preservative: benzododecinium bromide 0.012%. Xanthan gum is a purified high molecular weight polysaccharide gum produced from the fermentation by bacterium Xanthomonas campestris. An aqueous solution of xanthan gum, in the presence of tear protein (lysozyme), forms a gel. Upon contact with the precorneal tear film, Timolol GFS forms a gel that is subsequently removed by the flow of tears. chemical