Drugs Similar to TIMOLOL HEMIHYDRATE

Timolol ophthalmic solution 0.5%, is a non-selective beta-adrenergic antagonist for ophthalmic use. The chemical name of the active ingredient is (S)-1-[(1,1-dimethylethyl) amino]-3- [[4-(4-morpholinyl)-1,2,5-thiadiazol-3-yl]oxy]-2-propanol. Timolol hemihydrate is the levo isomer. Specific rotation is [α] 25 405nm=-16° (C=10% as the hemihydrate form in 1N HCl). The molecular formula of timolol is Formula C 13 H 24 N 4 O 3 S and its structural formula is: Timolol (as the hemihydrate) is a white, odorless, crystalline powder which is slightly soluble in water and freely soluble in ethanol. Timolol hemihydrate is stable at room temperature. Timolol ophthalmic solution is a clear, colorless, isotonic, sterile, microbiologically preserved phosphate buffered aqueous solution. It is supplied in dosage strength 0.5%. Each mL of timolol ophthalmic solution 0.5% contains 5.12 mg of timolol hemihydrate equivalent to 5.0 mg timolol. Inactive ingredients: monosodium and disodium phosphate dihydrate to adjust pH (6.5 - 7.5) and water for injection, benzalkonium chloride 0.01% added as preservative. The osmolality of timolol ophthalmic solution is 260 to 320 mosmol/kg. Image

Timolol ophthalmic solution 0.5%, is a non-selective beta-adrenergic antagonist for ophthalmic use. The chemical name of the active ingredient is (S)-1-[(1,1-dimethylethyl) amino]-3- [[4-(4-morpholinyl)-1,2,5-thiadiazol-3-yl]oxy]-2-propanol. Timolol hemihydrate is the levo isomer. Specific rotation is [α] 25 405nm=-16° (C=10% as the hemihydrate form in 1N HCl). The molecular formula of timolol is Formula C 13 H 24 N 4 O 3 S and its structural formula is: Timolol (as the hemihydrate) is a white, odorless, crystalline powder which is slightly soluble in water and freely soluble in ethanol. Timolol hemihydrate is stable at room temperature. Timolol ophthalmic solution is a clear, colorless, isotonic, sterile, microbiologically preserved phosphate buffered aqueous solution. It is supplied in dosage strength 0.5%. Each mL of timolol ophthalmic solution 0.5% contains 5.12 mg of timolol hemihydrate equivalent to 5.0 mg timolol. Inactive ingredients: monosodium and disodium phosphate dihydrate to adjust pH (6.5 - 7.5) and water for injection, benzalkonium chloride 0.01% added as preservative. The osmolality of timolol ophthalmic solution is 260 to 320 mosmol/kg. Image

Brimonidine tartrate and timolol maleate ophthalmic solution 0.2%/0.5%, sterile, is a relatively selective alpha-2 adrenergic receptor agonist with a non-selective beta-adrenergic receptor inhibitor (topical intraocular pressure lowering agent). The structural formulae are: Brimonidine tartrate: 5-bromo-6-(2-imidazolidinylideneamino) quinoxaline L-tartrate; MW= 442.24 Timolol maleate: (-)-1-( tert -butylamino)-3-[(4-morpholino-1,2,5-thiadiazol-3-yl)-oxy]-2-propanol maleate (1:1) (salt); MW= 432.50 as the maleate salt In solution, brimonidine tartrate and timolol maleate ophthalmic solution 0.2%/0.5% has a clear, greenish-yellow color. It has an osmolality of 260-330 mOsmol/kg and a pH during its shelf life of 6.5-7.3. Brimonidine tartrate appears as an off-white, or white to pale-yellow powder and is soluble in both water (1.5 mg/mL) and in the product vehicle (3 mg/mL) at pH 7.2. Timolol maleate appears as a white, odorless, crystalline powder and is soluble in water, methanol, and alcohol. Each mL of brimonidine tartrate and timolol maleate ophthalmic solution contains the active ingredients brimonidine tartrate 0.2% and timolol 0.5% with the inactive ingredients benzalkonium chloride 0.005%; sodium phosphate, monobasic; sodium phosphate, dibasic; purified water; and hydrochloric acid and/or sodium hydroxide to adjust pH. Brimonidine tartrate: Timolol maleate:

Brimonidine tartrate and timolol maleate ophthalmic solution 0.2%/0.5%, sterile, is a relatively selective alpha-2 adrenergic receptor agonist with a non-selective beta-adrenergic receptor inhibitor (topical intraocular pressure lowering agent). The structural formulae are: Brimonidine tartrate: 5-bromo-6-(2-imidazolidinylideneamino) quinoxaline L-tartrate; MW= 442.24 Timolol maleate: (-)-1-( tert -butylamino)-3-[(4-morpholino-1,2,5-thiadiazol-3-yl)-oxy]-2-propanol maleate (1:1) (salt); MW= 432.50 as the maleate salt In solution, (Brimonidine tartrate and timolol maleate ophthalmic solution) 0.2% /0.5% has a clear, greenish-yellow color. It has an osmolality of 260 to 330 mOsmol/kg and a pH during its shelf life of 6.5 to 7.3. Brimonidine tartrate appears as an off-white, or white to pale-yellow powder and is soluble in both water (1.5 mg/mL) and in the product vehicle (3 mg/mL) at pH 7.2. Timolol maleate appears as a white, odorless, crystalline powder and is soluble in water, methanol, and alcohol. Each mL of Brimonidine tartrate and timolol maleate ophthalmic solution contains the active ingredients brimonidine tartrate 0.2% and timolol 0.5% with the inactive ingredients benzalkonium chloride 0.005%; sodium phosphate, monobasic; sodium phosphate, dibasic; purified water; and hydrochloric acid and/or sodium hydroxide to adjust pH. brimo-timo-structure-brimonidine brimo-timo-struc-timolol

Brimonidine tartrate and timolol maleate ophthalmic solution, 0.2%/0.5%, sterile, is a relatively selective alpha-2 adrenergic receptor agonist with a non-selective beta-adrenergic receptor inhibitor (topical intraocular pressure lowering agent). The structural formulae are: Brimonidine tartrate: 5-bromo-6-(2-imidazolidinylideneamino) quinoxaline L-tartrate; MW= 442.24 Timolol maleate: (-)-1-( tert -butylamino)-3-[(4-morpholino-1,2,5-thiadiazol-3-yl)-oxy]-2-propanol maleate (1:1) (salt); MW= 432.50 as the maleate salt In solution, brimonidine tartrate and timolol maleate ophthalmic solution, 0.2%/0.5% has a clear, greenish-yellow color. It has an osmolality of 260 to 330 mOsmol/kg and a pH during its shelf life of 6.5 to 7.3. Brimonidine tartrate appears as an off-white or white to pale-yellow powder and is soluble in both water (1.5 mg/mL) and in the product vehicle (3 mg/mL) at pH 7.2. Timolol maleate appears as a white, odorless, crystalline powder and is soluble in water, methanol, and alcohol. Each mL of brimonidine tartrate and timolol maleate ophthalmic solution, 0.2%/0.5% contains Actives: brimonidine tartrate 0.2% (2 mg), timolol maleate 6.8 mg equivalent to timolol 0.5% (5 mg). Preservative: benzalkonium chloride 0.005%. Inactives: purified water; sodium phosphate, monobasic; sodium phosphate, dibasic; hydrochloric acid and/or sodium hydroxide to adjust pH. brimonidinetarstructure timololmaleatestruct

Brimonidine tartrate and timolol maleate ophthalmic solution 0.2%/0.5%, sterile, is a relatively selective alpha-2 adrenergic receptor agonist with a non-selective beta-adrenergic receptor inhibitor (topical intraocular pressure lowering agent). The structural formulae are: Brimonidine tartrate: 5-bromo-6-(2-imidazolidinylideneamino) quinoxaline L-tartrate; MW= 442.24 Timolol maleate: (-)-1-( tert -butylamino)-3-[(4-morpholino-1,2,5-thiadiazol-3-yl)-oxy]-2-propanol maleate (1:1) (salt); MW= 432.50 as the maleate salt In solution, brimonidine tartrate and timolol maleate ophthalmic solution 0.2% /0.5% has a clear, greenish-yellow color. It has an osmolality of 260 to 330 mOsmol/kg and a pH during its shelf life of 6.5 to 7.3. Brimonidine tartrate appears as an off-white, or white to pale-yellow powder and is soluble in both water (1.5 mg/mL) and in the product vehicle (3 mg/mL) at pH 7.2. Timolol maleate appears as a white, odorless, crystalline powder and is soluble in water, methanol, and alcohol. Each mL of brimonidine tartrate and timolol maleate ophthalmic solution contains the active ingredients brimonidine tartrate 0.2% and timolol 0.5% with the inactive ingredients benzalkonium chloride 0.005%; sodium phosphate, monobasic; sodium phosphate, dibasic; purified water; and hydrochloric acid and/or sodium hydroxide to adjust pH. brimo-timo-structure-brimonidine brimo-timo-struc-timolol

Brimonidine tartrate/timolol maleate ophthalmic solution 0.2%/0.5%, sterile, is a relatively selective alpha-2 adrenergic receptor agonist with a non-selective beta-adrenergic receptor inhibitor (topical intraocular pressure lowering agent). The structural formulae are: Brimonidine tartrate: 5-bromo-6-(2-imidazolidinylideneamino) quinoxaline L-tartrate; MW= 442.24 Timolol maleate: (-)-1-( tert -butylamino)-3-[(4-morpholino-1,2,5-thiadiazol-3-yl)-oxy]-2-propanol maleate (1:1) (salt); MW= 432.50 as the maleate salt In solution, brimonidine tartrate/timolol maleate ophthalmic solution 0.2%/0.5% has a clear, greenish-yellow color. It has an osmolality of 260 to 330 mOsmol/kg and a pH during its shelf life of 6.5 to 7.3. Brimonidine tartrate appears as an off-white, or white to pale-yellow powder and is soluble in both water (1.5 mg/mL) and in the product vehicle (3 mg/mL) at pH 7.2. Timolol maleate appears as a white, odorless, crystalline powder and is soluble in water, methanol, and alcohol. Each mL of brimonidine tartrate/timolol maleate ophthalmic solution contains the active ingredients brimonidine tartrate 0.2% and timolol 0.5% with the inactive ingredients benzalkonium chloride 0.005%; sodium phosphate, dibasic heptahydrate; sodium phosphate, monobasic monohydrate; water for injection; and hydrochloric acid and/or sodium hydroxide to adjust pH. brimonidine-tartrate-stru-jpg timolol-maleate-stru-jpg

Brimonidine tartrate/timolol maleate ophthalmic solution 0.2%/0.5%, sterile, is a relatively selective alpha-2 adrenergic receptor agonist with a non-selective beta-adrenergic receptor inhibitor (topical intraocular pressure lowering agent). The structural formulae are: Brimonidine tartrate: 5-bromo-6-(2-imidazolidinylideneamino) quinoxaline L-tartrate; MW= 442.24 Timolol maleate: (-)-1-( tert -butylamino)-3-[(4-morpholino-1,2,5-thiadiazol-3-yl)-oxy]-2-propanol maleate (1:1) (salt); MW= 432.50 as the maleate salt Brimonidine tartrate/timolol maleate ophthalmic solution 0.2%/0.5% has a clear, greenish-yellow color. It has an osmolality of 260 to 330 mOsmol/kg and a pH during its shelf life of 6.5 to 7.3. Brimonidine tartrate appears as an off-white, or white to pale-yellow powder and is soluble in both water (1.5 mg/mL) and in the product vehicle (3 mg/mL) at pH 7.2. Timolol maleate appears as a white, odorless, crystalline powder and is soluble in water, methanol, and alcohol. Each mL of brimonidine tartrate/timolol maleate ophthalmic solution contains the active ingredients brimonidine tartrate 0.2% and timolol 0.5% with the inactive ingredients benzalkonium chloride 0.005%; sodium phosphate, monobasic; sodium phosphate, dibasic; purified water; and hydrochloric acid and/or sodium hydroxide to adjust pH. Chemical Structure Chemical Structure

Brimonidine tartrate/timolol maleate ophthalmic solution 0.2%/0.5%, sterile, is a relatively selective alpha-2 adrenergic receptor agonist with a non-selective beta-adrenergic receptor inhibitor (topical intraocular pressure lowering agent). The structural formulae are: Brimonidine tartrate: 5-bromo-6-(2-imidazolidinylideneamino) quinoxaline L-tartrate; MW= 442.24 Timolol maleate: (-)-1-( tert -butylamino)-3-[(4-morpholino-1,2,5-thiadiazol-3-yl)-oxy]-2-propanol maleate (1:1) (salt); MW= 432.50 as the maleate salt In solution, brimonidine tartrate/timolol maleate ophthalmic solution 0.2%/0.5% has a clear, greenish-yellow color. It has an osmolality of 260-330 mOsmol/kg and a pH during its shelf life of 6.5-7.3. Brimonidine tartrate appears as pale yellow colored powder to wheatish colored powder and is soluble in both water (1.5 mg/mL) and in the product vehicle (3 mg/mL) at pH 7.2. Timolol maleate appears as a white to almost white, crystalline powder and is soluble in water, methanol, and alcohol. Each mL of brimonidine tartrate/timolol maleate ophthalmic solution contains the active ingredients brimonidine tartrate 0.2% and timolol 0.5% with the inactive ingredients benzalkonium chloride 0.005%; sodium phosphate, monobasic; sodium phosphate, dibasic; water for injection; and hydrochloric acid and/or sodium hydroxide to adjust pH. Image Image

Brimonidine Tartrate/Timolol Maleate Ophthalmic Solution 0.2%/0.5%, sterile, is a relatively selective alpha-2 adrenergic receptor agonist with a non-selective beta-adrenergic receptor inhibitor (topical intraocular pressure lowering agent). The structural formulae are: Brimonidine tartrate: 5-bromo-6-(2-imidazolidinylideneamino) quinoxaline L-tartrate; MW= 442.22 Timolol maleate: (-)-1-( tert -butylamino)-3-[(4-morpholino-1,2,5-thiadiazol-3-yl)-oxy]-2-propanol maleate (1:1) (salt); MW= 432.49 as the maleate salt In solution, Brimonidine Tartrate/Timolol Maleate Ophthalmic Solution 0.2%/0.5% has a clear, greenish-yellow color. It has an osmolality of 260-330 mOsmol/kg and a pH during its shelf life of 6.5-7.3. Brimonidine tartrate appears as a white, or slightly yellowish, or slightly brownish powder and is soluble in water and practically insoluble in anhydrous ethanol and toluene. Timolol maleate appears as a white to practically white powder and is soluble in water, methanol, and alcohol, sparingly soluble in chloroform and propylene glycol and insoluble in ether and cyclohexane. Each mL of Brimonidine Tartrate/Timolol Maleate Ophthalmic Solutioncontains the active ingredients brimonidine tartrate 0.2% and timolol 0.5% with the inactive ingredients benzalkonium chloride 0.005%; sodium phosphate, monobasic; sodium phosphate, dibasic; water for injection; and hydrochloric acid and/or sodium hydroxide to adjust pH. structure structure1

Brimonidine tartrate/timolol maleate ophthalmic solution 0.2%/0.5%, sterile, is a relatively selective alpha-2 adrenergic receptor agonist with a non-selective beta-adrenergic receptor inhibitor (topical intraocular pressure lowering agent). The structural formulae are: Brimonidine tartrate: 5-bromo-6-(2-imidazolidinylideneamino) quinoxaline L-tartrate; MW= 442.24 Timolol maleate: (-)-1-( tert -butylamino)-3-[(4-morpholino-1,2,5-thiadiazol-3-yl)-oxy]-2-propanol maleate (1:1) (salt); MW= 432.50 as the maleate salt In solution, brimonidine tartrate/timolol maleate ophthalmic solution 0.2%/0.5% has a clear, greenish-yellow color. It has an osmolality of 260 to 330 mOsmol/kg and a pH during its shelf life of 6.5 to 7.3. Brimonidine tartrate appears as an off-white, or white to pale-yellow powder and is soluble in both water (1.5 mg/mL) and in the product vehicle (3 mg/mL) at pH 7.2. Timolol maleate appears as a white, odorless, crystalline powder and is soluble in water, methanol, and alcohol. Each mL of brimonidine tartrate/timolol maleate ophthalmic solution contains the active ingredients brimonidine tartrate 0.2% and timolol 0.5% with the inactive ingredients benzalkonium chloride 0.005%; dibasic sodium phosphate USP, monobasic sodium phosphate USP, water for injection. Hydrochloric acid and/or sodium hydroxide to adjust pH. Brimonidine tartrate chemical structure Timolol maleate chemical structure

Brimonidine tartrate/timolol maleate ophthalmic solution 0.2%/0.5%, sterile, is a relatively selective alpha-2 adrenergic receptor agonist with a non-selective beta-adrenergic receptor inhibitor (topical intraocular pressure lowering agent). The structural formulae are: Brimonidine tartrate: 5-bromo-6-(2-imidazolidinylideneamino) quinoxaline L-tartrate; MW= 442.24 Timolol maleate: (-)-1-( tert -butylamino)-3-[(4-morpholino-1,2,5-thiadiazol-3-yl)-oxy]-2-propanol maleate (1:1) (salt); MW= 432.50 as the maleate salt In solution, Brimonidine tartrate/timolol maleate ophthalmic solution 0.2%/0.5% has a clear, greenish-yellow color. It has an osmolality of 260-330 mOsmol/kg and a pH during its shelf life of 6.5-7.3. Brimonidine tartrate appears as an off-white, or white to pale-yellow powder and is soluble in both water (1.5 mg/mL) and in the product vehicle (3 mg/mL) at pH 7.2. Timolol maleate appears as a white, odorless, crystalline powder and is soluble in water, methanol, and alcohol. Each mL of Brimonidine tartrate/timolol maleate ophthalmic solution contains the active ingredients brimonidine tartrate 0.2% and timolol 0.5% with the inactive ingredients benzalkonium chloride 0.005%; sodium phosphate, monobasic; sodium phosphate, dibasic; water for injection; and hydrochloric acid and/or sodium hydroxide to adjust pH. brimonidine-timolol-brimo-structure brimonidine-timolol-timo-structure

Brimonidine tartrate/timolol maleate ophthalmic solution 0.2%/0.5%, sterile, is a relatively selective alpha-2 adrenergic receptor agonist with a non-selective beta-adrenergic receptor inhibitor (topical intraocular pressure lowering agent). The structural formulae are: Brimonidine tartrate: 5-bromo-6-(2-imidazolidinylideneamino) quinoxaline L-tartrate; MW= 442.24 Timolol maleate: (-)-1-( tert -butylamino)-3-[(4-morpholino-1,2,5-thiadiazol-3-yl)-oxy]-2-propanol maleate (1:1) (salt); MW= 432.50 as the maleate salt In solution, Brimonidine tartrate/timolol maleate ophthalmic solution 0.2%/0.5% has a clear, greenish-yellow color. It has an osmolality of 260-330 mOsmol/kg and a pH during its shelf life of 6.5-7.3. Brimonidine tartrate appears as a pale yellow colored powder to wheatish colored powder and is soluble in water and practically insoluble in anhydrous ethanol and in toluene. Timolol maleate appears as a white or almost white, crystalline powder and is soluble in water; sparingly soluble in ethanol; slightly soluble in chloroform; practically insoluble in ether. Each mL of brimonidine tartrate/timolol maleate ophthalmic solution contains the active ingredients brimonidine tartrate 0.2% and timolol 0.5% with the inactive ingredients benzalkonium chloride 0.005%; sodium phosphate, monobasic; sodium phosphate, dibasic; water for injection; and hydrochloric acid and/or sodium hydroxide to adjust pH. brimonidine-timolol-brimo-structure brimonidine-timolol-timo-structure

Brimonidine Tartrate/Timolol Maleate Ophthalmic Solution 0.2%/0.5%, sterile, is a relatively selective alpha-2 adrenergic receptor agonist with a non-selective beta-adrenergic receptor inhibitor (topical intraocular pressure lowering agent). The structural formulae are: Brimonidine tartrate: 5-bromo-6-(-2-imidazolin-2-ylamino) quinoxaline D-tartrate (1:1); MW= 442.22 Timolol maleate: (-)-1-( tert -butylamino)-3-[(4-morpholino-1,2,5-thiadiazol-3-yl)-oxy]-2-propanol maleate (1:1) (salt); MW= 432.50 as the maleate salt In solution, Brimonidine Tartrate/Timolol Maleate Ophthalmic Solution 0.2%/0.5% has a clear, greenish-yellow color. It has an osmolality of 260-330 mOsmol/kg and a pH during its shelf life of 6.5-7.3. Brimonidine tartrate appears as a white to slightly yellowish powder and is soluble in both water (1.5 mg/mL) and in the product vehicle (3 mg/mL) at pH 7.2. Timolol maleate appears as a white or practically white, odorless, crystalline powder and is soluble in water, methanol, and alcohol. Each mL of Brimonidine Tartrate/Timolol Maleate Ophthalmic Solution contains the active ingredients brimonidine tartrate 0.2% and timolol 0.5% with the inactive ingredients benzalkonium chloride 0.005%; sodium phosphate dibasic heptahydrate; sodium phosphate monobasic monohydrate; water for injection; and hydrochloric acid and/or sodium hydroxide to adjust pH.

Brimonidine Tartrate/Timolol Maleate Ophthalmic Solution 0.2%/0.5%, sterile, is a relatively selective alpha-2 adrenergic receptor agonist with a non-selective beta-adrenergic receptor inhibitor (topical intraocular pressure lowering agent). The structural formulae are: Brimonidine tartrate: 5-bromo-6-(-2-imidazolin-2-ylamino) quinoxaline D-tartrate (1:1); MW= 442.22 Timolol maleate: (-)-1-( tert -butylamino)-3-[(4-morpholino-1,2,5-thiadiazol-3-yl)-oxy]-2-propanol maleate (1:1) (salt); MW= 432.50 as the maleate salt In solution, Brimonidine Tartrate/Timolol Maleate Ophthalmic Solution 0.2%/0.5% has a clear, greenish-yellow color. It has an osmolality of 260-330 mOsmol/kg and a pH during its shelf life of 6.5-7.3. Brimonidine tartrate appears as a white to slightly yellowish powder and is soluble in both water (1.5 mg/mL) and in the product vehicle (3 mg/mL) at pH 7.2. Timolol maleate appears as a white or practically white, odorless, crystalline powder and is soluble in water, methanol, and alcohol. Each mL of Brimonidine Tartrate/Timolol Maleate Ophthalmic Solution contains the active ingredients brimonidine tartrate 0.2% and timolol 0.5% with the inactive ingredients benzalkonium chloride 0.005%; sodium phosphate dibasic heptahydrate; sodium phosphate monobasic monohydrate; water for injection; and hydrochloric acid and/or sodium hydroxide to adjust pH. brimonidine timolol

D ESCRIPTION COMBIGAN ® (brimonidine tartrate/timolol maleate ophthalmic solution) 0.2%/0.5%, sterile, is a relatively selective alpha-2 adrenergic receptor agonist with a non-selective beta-adrenergic receptor inhibitor (topical intraocular pressure lowering agent). The structural formulae are: Brimonidine tartrate: 5-bromo-6-(2-imidazolidinylideneamino) quinoxaline L-tartrate; MW= 442.24 Timolol maleate: (-)-1-( tert -butylamino)-3-[(4-morpholino-1,2,5-thiadiazol-3-yl)-oxy]-2-propanol maleate (1:1) (salt); MW= 432.50 as the maleate salt In solution, COMBIGAN ® (brimonidine tartrate/timolol maleate ophthalmic solution) 0.2%/0.5% has a clear, greenish-yellow color. It has an osmolality of 260-330 mOsmol/kg and a pH during its shelf life of 6.5-7.3. Brimonidine tartrate appears as an off-white, or white to pale-yellow powder and is soluble in both water (1.5 mg/mL) and in the product vehicle (3 mg/mL) at pH 7.2. Timolol maleate appears as a white, odorless, crystalline powder and is soluble in water, methanol, and alcohol. Each mL of COMBIGAN ® contains the active ingredients brimonidine tartrate 0.2% and timolol 0.5% with the inactive ingredients benzalkonium chloride 0.005%; sodium phosphate, monobasic; sodium phosphate, dibasic; purified water; and hydrochloric acid and/or sodium hydroxide to adjust pH. The structural formulae are: Brimonidine tartrate: Timolol maleate:

COSOPT (dorzolamide hydrochloride and timolol maleate ophthalmic solution) is the combination of a topical carbonic anhydrase inhibitor and a topical beta-adrenergic receptor blocking agent. Dorzolamide hydrochloride is described chemically as: (4 S-trans )-4-(ethylamino)-5,6-dihydro-6-methyl-4 H -thieno[2,3- b ]thiopyran-2-sulfonamide 7,7-dioxide monohydrochloride. Dorzolamide hydrochloride is optically active. The specific rotation is: [α] 25°C (C=1, water) = ~-17°. 405 nm Its empirical formula is C 10 H 16 N 2 O 4 S 3 ∙ HCl and its structural formula is: Dorzolamide hydrochloride has a molecular weight of 360.91. It is a white to off-white, crystalline powder, which is soluble in water and slightly soluble in methanol and ethanol. Timolol maleate is described chemically as: (-)-1-( tert -butylamino)-3-[(4-morpholino-1,2,5-thiadiazol-3-yl)oxy]-2-propanol maleate (1:1) (salt). Timolol maleate possesses an asymmetric carbon atom in its structure and is provided as the levo-isomer. The optical rotation of timolol maleate is: [α] 25°C in 1N HCl (C = 5) = -12.2° (-11.7° to -12.5°). 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 maleate is stable at room temperature. COSOPT is supplied as a sterile, clear, colorless to nearly colorless, isotonic, buffered, slightly viscous, aqueous solution. The pH of the solution is approximately 5.65, and the osmolarity is 242 to 323 mOsM. Each mL of COSOPT contains 20 mg dorzolamide (equivalent to 22.26 mg of dorzolamide hydrochloride) and 5 mg timolol (equivalent to 6.83 mg timolol maleate). Inactive ingredients are sodium citrate, hydroxyethyl cellulose, sodium hydroxide, mannitol, and water for injection. Benzalkonium chloride 0.0075% is added as a preservative. Chemical Structure Chemical Structure

COSOPT PF (dorzolamide hydrochloride-timolol maleate ophthalmic solution) is the combination of a topical carbonic anhydrase inhibitor and a topical beta-adrenergic receptor blocking agent. Dorzolamide hydrochloride is described chemically as: (4 S-trans )-4-(ethylamino)-5,6-dihydro-6-methyl-4 H -thieno[2,3- b ]thiopyran-2-sulfonamide 7,7-dioxide monohydrochloride. Dorzolamide hydrochloride is optically active. The specific rotation is: [α] 25°C 405 nm (C=1, water) = ~ -17°. Its empirical formula is C 10 H 16 N 2 O 4 S 3 ∙HCl and its structural formula is: Dorzolamide hydrochloride has a molecular weight of 360.91. It is a white to off-white, crystalline powder, which is soluble in water and slightly soluble in methanol and ethanol. Timolol maleate is described chemically as: (-)-1-( tert -butylamino)-3-[(4-morpholino-1,2,5-thiadiazol-3-yl)oxy]-2-propanol maleate (1:1) (salt). Timolol maleate possesses an asymmetric carbon atom in its structure and is provided as the levo-isomer. The optical rotation of timolol maleate is: [α] 25°C 405 nm in 1N HCl (C = 5) = -12.2° (-11.7° to -12.5°). Its molecular formula is C13H24N4O3S∙C4H4O4 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 maleate is stable at room temperature. COSOPT PF is supplied as a sterile, clear, colorless to nearly colorless, isotonic, buffered, slightly viscous, aqueous solution. The pH of the solution is approximately 5.65, and the osmolarity is 242-323 mOsM. Each mL of COSOPT PF contains 20 mg dorzolamide (22.26 mg of dorzolamide hydrochloride) and 5 mg timolol (6.83 mg timolol maleate). Inactive ingredients are sodium citrate, hydroxyethyl cellulose, sodium hydroxide, mannitol, and water for injection. COSOPT PF does not contain a preservative. Chemical Structure Chemical Structure

Dorzolamide hydrochloride and timolol maleate ophthalmic solution, USP is the combination of a topical carbonic anhydrase inhibitor and a topical beta-adrenergic receptor blocking agent. Dorzolamide hydrochloride is described chemically as: ( 4S-trans )-4- (ethylamino)- 5,6-dihydro-6-methyl- 4H -thieno[2,3- b ]thiopyran-2-sulfonamide 7,7-dioxide monohydrochloride. Dorzolamide hydrochloride is optically active. The specific rotation is: Image Image Its empirical formula is C 10 H 16 N 2 O 4 S 3 •HCl and its structural formula is: Image Image Dorzolamide hydrochloride has a molecular weight of 360.91. It is a white to off-white, crystalline powder, which is soluble in water and slightly soluble in methanol and ethanol. Timolol maleate is described chemically as: (-)-1-(tert-butylamino)-3-[(4- morpholino-1,2,5-thiadiazol-3-yl)oxy]-2-propanol maleate (1:1) (salt). Timolol maleate possesses an asymmetric carbon atom in its structure and is provided as the levo-isomer. The optical rotation of timolol maleate is: Image Image Its molecular formula is C 13 H 24 N 4 O 3 S•C 4 H 4 O 4 and its structural formula is: Image Image 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 maleate is stable at room temperature. Dorzolamide hydrochloride and timolol maleate ophthalmic solution, USP is supplied as a sterile, clear, colorless to nearly colorless, isotonic, buffered, slightly viscous, aqueous solution. The pH of the solution is approximately 5.65, and the osmolarity is 242-323 mOsM. Each mL of Dorzolamide hydrochloride and timolol maleate ophthalmic solution, USP contains 20 mg dorzolamide (22.26 mg of dorzolamide hydrochloride) and 5 mg timolol (6.83 mg timolol maleate). Inactive ingredients are sodium citrate, hydroxyethyl cellulose, sodium hydroxide, mannitol, and water for injection. Benzalkonium chloride 0.0075% is added as a preservative. a c b f

Dorzolamide hydrochloride and timolol maleate ophthalmic solution, USP is the combination of a topical carbonic anhydrase inhibitor and a topical beta-adrenergic receptor blocking agent. Dorzolamide hydrochloride USP is described chemically as: (4 S-trans )-4-(ethylamino)-5,6-dihydro-6-methyl-4 H -thieno[2,3- b ]thiopyran-2-sulfonamide 7,7-dioxide monohydrochloride. Dorzolamide hydrochloride is optically active. The specific rotation is: [α] 25°C (C=1, water) = ~ -17°. 405 nm Its molecular formula is C 10 H 16 N 2 O 4 S 3 •HCl and its structural formula is: Dorzolamide hydrochloride USP has a molecular weight of 360.91. It is a white to off-white, crystalline powder, which is soluble in water and slightly soluble in methanol and ethanol. Timolol maleate USP is described chemically as: (-)-1-( tert -butylamino)-3- [(4-morpholino-1,2,5-thiadiazol-3-yl)oxy]-2-propanol maleate (1:1) (salt). Timolol maleate possesses an asymmetric carbon atom in its structure and is provided as the levo-isomer. The optical rotation of timolol maleate is: [α] 25°C in 1N HCl (C=5) = -12.2° (-11.7° to -12.5°). 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 USP has a molecular weight of 432.50. It is a white to practically white powder which is soluble in water, methanol, and alcohol. Timolol maleate is stable at room temperature. Dorzolamide hydrochloride and timolol maleate ophthalmic solution, USP is supplied as a sterile, clear, colorless to nearly colorless, isotonic, buffered, slightly viscous, aqueous solution. The pH of the solution is approximately 5.65, and the osmolarity is 242 to 323 mOsM. Each mL of Dorzolamide hydrochloride and timolol maleate ophthalmic solution, USP contains 20 mg dorzolamide (equivalent to 22.26 mg of dorzolamide hydrochloride USP) and 5 mg timolol (equivalent to 6.83 mg timolol maleate USP). Inactive ingredients are sodium citrate, hydroxyethyl cellulose, sodium hydroxide, mannitol, and water for injection. Benzalkonium chloride 0.0075% is added as a preservative. Chemical Structure of Dorzolamide Chemical Structure of Timolol maleate

Dorzolamide hydrochloride and timolol maleate ophthalmic solution, USP is the combination of a topical carbonic anhydrase inhibitor and a topical beta-adrenergic receptor blocking agent. Dorzolamide hydrochloride, USP is described chemically as: (4S-trans) -4-(ethylamino)-5,6-dihydro-6-methyl- 4H -thieno[2,3- b ]thiopyran-2-sulfonamide 7,7-dioxide monohydrochloride. Dorzolamide hydrochloride, USP is optically active. The specific rotation is: Its empirical formula is C 10 H 16 N 2 O 4 S 3 •HCl and its structural formula is: Dorzolamide hydrochloride, USP has a molecular weight of 360.90. It is a white to off-white, crystalline powder, which is soluble in water and slightly soluble in methanol and ethanol. Timolol maleate, USP is described chemically as: (-)-1-( tert -butylamino)-3-[(4-morpholino-1,2,5-thiadiazol-3-yl)oxy]-2-propanol maleate (1:1) (salt). Timolol maleate, USP possesses an asymmetric carbon atom in its structure and is provided as the levo-isomer. The optical rotation of timolol maleate, USP is: 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, USP has a molecular weight of 432.49. It is a white, odorless, crystalline powder which is soluble in water, methanol, and alcohol. Timolol maleate is stable at room temperature. Dorzolamide hydrochloride and timolol maleate ophthalmic solution is supplied as a sterile, clear, colorless to nearly colorless, isotonic, buffered, slightly viscous, aqueous solution. The pH of the solution is approximately 5.65, and the osmolarity is 242 to 323 mOsM. Each mL of dorzolamide hydrochloride and timolol maleate ophthalmic solution contains 20 mg dorzolamide (equivalent to 22.26 mg of dorzolamide hydrochloride) and 5 mg timolol (equivalent to 6.83 mg timolol maleate). Inactive ingredients are hydroxyethyl cellulose, mannitol, sodium citrate dihydrate, sodium hydroxide, and water for injection. Benzalkonium chloride 0.0075% is added as a preservative. SpecificRotation ChemStructure1 ChemStructure2 ChemStructure3

Dorzolamide hydrochloride and timolol maleate ophthalmic solution, USP is the combination of a topical carbonic anhydrase inhibitor and a topical beta-adrenergic receptor blocking agent. Dorzolamide hydrochloride, USP is described chemically as: (4S-trans) -4-(ethylamino)-5,6-dihydro-6-methyl- 4H -thieno[2,3- b ]thiopyran-2-sulfonamide 7,7-dioxide monohydrochloride. Dorzolamide hydrochloride, USP is optically active. The specific rotation is: Its empirical formula is C 10 H 16 N 2 O 4 S 3 •HCl and its structural formula is: Dorzolamide hydrochloride, USP has a molecular weight of 360.90. It is a white to off-white, crystalline powder, which is soluble in water and slightly soluble in methanol and ethanol. Timolol maleate, USP is described chemically as: (-)-1-( tert -butylamino)-3-[(4-morpholino-1,2,5-thiadiazol-3-yl)oxy]-2-propanol maleate (1:1) (salt). Timolol maleate, USP possesses an asymmetric carbon atom in its structure and is provided as the levo-isomer. The optical rotation of timolol maleate, USP is: 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, USP has a molecular weight of 432.49. It is a white, odorless, crystalline powder which is soluble in water, methanol, and alcohol. Timolol maleate is stable at room temperature. Dorzolamide hydrochloride and timolol maleate ophthalmic solution is supplied as a sterile, clear, colorless to nearly colorless, isotonic, buffered, slightly viscous, aqueous solution. The pH of the solution is approximately 5.65, and the osmolarity is 242 to 323 mOsM. Each mL of dorzolamide hydrochloride and timolol maleate ophthalmic solution contains 20 mg dorzolamide (equivalent to 22.26 mg of dorzolamide hydrochloride) and 5 mg timolol (equivalent to 6.83 mg timolol maleate). Inactive ingredients are hydroxyethyl cellulose, mannitol, sodium citrate dihydrate, sodium hydroxide, and water for injection. Benzalkonium chloride 0.0075% is added as a preservative. SpecificRotation ChemStructure1 ChemStructure2 ChemStructure3