Timoptic XE
Generic name:timolol maleate
Dosage form: ophthalmic solution, gel forming
Drug class:Ophthalmic glaucoma agents
Medically reviewed by Drugs.com. Last updated on Mar 1, 2022.
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DESCRIPTION
TIMOPTIC-XE® (timolol maleate ophthalmic gel forming solution) 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:
- 25°
[α] in 1.0N HCl (C = 5%) = -12.2° (-11.7° to -12.5°).
- 405 nm
Its molecular formula is C13H24N4O3S•C4H4O4 and its structural formula is:
Timolol maleate has a molecular weight of 432.49. It is a white, odorless, crystalline powder which is soluble in water; sparingly soluble in ethanol; slightly soluble in chloroform; practically insoluble in ether.
TIMOPTIC-XE Sterile Ophthalmic Gel Forming Solution is supplied as a sterile, isotonic, buffered, aqueous solution of timolol maleate in two dosage strengths. The pH of the solution is approximately 7.0, and the osmolarity is 260-330 mOsm. Each mL of TIMOPTIC-XE 0.25% contains 2.5 mg of timolol (3.4 mg of timolol maleate). Each mL of TIMOPTIC-XE 0.5% contains 5 mg of timolol (6.8 mg of timolol maleate). Inactive ingredients: gellan gum, tromethamine, mannitol, and water for injection. Preservative: benzododecinium bromide 0.012%.
The gel forming solution contains a purified anionic heteropolysaccharide derived from gellan gum. An aqueous solution of gellan gum, in the presence of a cation, has the ability to gel. Upon contact with the precorneal tear film, TIMOPTIC-XE forms a gel that is subsequently removed by the flow of tears.
