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(dorzolamide hydrochloride-timolol maleate) Sterile Ophthalmic Solution
COSOPT (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: (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:
α 25° (C=1, water) = ~ -17°.
Its empirical formula is C10H16N2O4S3•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°).
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 (dorzolamide hydrochloride-timolol maleate ophthalmic solution) is supplied as a sterile, 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 (dorzolamide hydrochloride-timolol maleate ophthalmic solution) 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.
What are the possible side effects of dorzolamide and timolol ophthalmic (Cosopt)?
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.
Although the risk of serious side effects is low when dorzolamide and timolol is used in the eyes, you should be aware of side effects that can occur if the medication is absorbed into your bloodstream.
Stop using dorzolamide ophthalmic and call your doctor at once if you have a serious side effect such as:
- swelling or redness of your eyelids;
- eye redness, pain, discomfort,...
What are the precautions when taking dorzolamide hydrochloride-timolol maleate ophthalmic solution (Cosopt)?
Before using timolol/dorzolamide, tell your doctor or pharmacist if you are allergic to these drugs; 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).
Before using this medication, tell your...
Last reviewed on RxList: 7/20/2010
This monograph has been modified to include the generic and brand name in many instances.
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