Timoptic (Timolol Maleate Ophthalmic Solution) Drug Information: Description, User Reviews, Drug Side Effects, Interactions

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May 26, 2012

Timoptic

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Timoptic

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TIMOPTIC® 0.25% AND 0.5%
(timolol maleate) Ophthalmic Solution 0.25% AND 0.5%

STERILE OPHTHALMIC SOLUTION

DRUG DESCRIPTION

TIMOPTIC* (timolol maleate ophthalmic solution) is a non-selective beta-adrenergic receptor blocking agent. Its chemical name is (-)-l-(tert-butylamino)-3- [(4-morpholino-l, 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 l.0N HC1 (C = 5%) = -12.2° (-11.7° to -12.5°).
	405 nm

Its molecular formula is C₁₃H₂₄N₄O₃S•C₄H₄O₄ and its structural formula is:

TIMOPTIC® (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 is stable at room temperature.

TIMOPTIC Ophthalmic Solution is supplied as a sterile, isotonic, buffered, aqueous solution of timolol maleate in two dosage strengths: Each mL of TIMOPTIC 0.25% contains 2.5 mg of timolol (3.4 mg of timolol maleate). The pH of the solution is approximately 7.0, and the osmolarity is 274-328 mOsm. Each mL of TIMOPTIC 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.

What are the possible side effects of timolol ophthalmic?

Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.

Stop using this medication and call your doctor at once if you have any of these serious side effects:

swelling or redness of your eyelids;
eye redness, discomfort, or sensitivity to light;
drainage, crusting, or oozing of your eyes or eyelids;
depressed mood, confusion, hallucinations, unusual thoughts or behavior;
wheezing,...

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What are the precautions when taking timolol maleate ophthalmic solution (Timoptic)?

Before using timolol, tell your doctor or pharmacist if you are allergic to it; or if you have any other allergies. This product may contain inactive ingredients (such as preservatives like benzalkonium chloride), which can cause allergic reactions or other problems. Talk to your pharmacist for more details.

This medication should not be used if you have certain medical conditions. Before using this medicine, consult your doctor or pharmacist if you have: lung disease (e.g., current or past history of asthma, severe chronic obstructive pulmonary disease), certain types of irregular heartbeats (e.g., sinus bradycardia, second or third degree AV block), certain types of heart disease (e.g., severe heart failure, cardiogenic shock).

Before using this medication, tell your...

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Last reviewed on RxList: 10/11/2011
This monograph has been modified to include the generic and brand name in many instances.