timolol maleate ophthalmic - Generic Medications

Timolol maleate ophthalmic solution, USP is a non-selective beta-adrenergic receptor blocking agent. Its chemical name is (-)-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: 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; sparingly soluble in ethanol; slightly soluble in chloroform; practically insoluble in ether. Timolol maleate ophthalmic solution is stable at room temperature. Timolol Maleate Ophthalmic Solution, USP is supplied as a sterile, isotonic, buffered, aqueous solution of timolol maleate in two dosage strengths. Each mL of timolol maleate ophthalmic solution USP, 0.25% contains 2.5 mg of timolol (3.4 mg of timolol maleate). The pH of the solution is between 6.5 and 7.5, and the osmolality is 260 to 340 mOsm/kg. Each mL of timolol maleate ophthalmic solution USP, 0.5% contains 5 mg of timolol (6.8 mg of timolol maleate). Inactive ingredients: monobasic and dibasic sodium phosphate, sodium hydroxide to adjust pH, and water for injection. Benzalkonium chloride 0.01% is added as preservative. timololmaleate-fig.jpg timololmaleate-stru.jpg