Timoptic-XE

Drug Description
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TIMOPTIC-XE®
0.25% AND 0.5%
(timolol maleate) Ophthalmic Gel Forming Solution

DRUG 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:

TIMOPTIC-XE® (Timolol Maleate) Structural Formula Illustration

Timolol maleate has a molecular weight of 432.50. It is a white, odorless, crystalline powder which is soluble in water, methanol, and alcohol.

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.

Last updated on RxList: 2/26/2009


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