DORZOLAMIDE HYDROCHLORIDE AND TIMOLOL MALEATE 20 mg/mL; 5 mg/mL Solution/ Drops
🆔 Identity & classification
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🏷️ RxNorm drug class
This medicine belongs to the beta-Adrenergic Blocker class.
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🏭 Manufacturer & labeler
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🩺 Clinical
Dorzolamide and timolol is used to treat glaucoma and ocular hypertension (eye conditions that lead to increased intraocular pressure and can progress to vision loss). Dorzolamide is in a class of medications called topical carbonic anhydrase inhibitors. Timolol is in a class of medications called topical beta blockers. Dorzolamide and timolol lowers pressure in the eye by decreasing the production of natural fluids in the eye.
Read the full MedlinePlus article ↗- Your eye constantly produces a fluid called aqueous humor, and if too much builds up, the pressure inside your eye rises. That extra pressure can damage your optic nerve over time,...
- What exactly does this eye drop do — and why do I need two medications in one?
- Yes, and this is one of the most important things to know. Both ingredients are absorbed into your bloodstream through the tissues of your eye and tear duct. Timolol, in particular...
- I only put it in my eye — can it really affect my heart or lungs?
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Supplement & herbal interactions
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🧪 Inactive Ingredients / Excipients
Inactive ingredients, also called excipients, are components of the drug product other than the active ingredient. They may include fillers, dyes, coatings, preservatives, flavors, or other formulation ingredients.
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UNII ZYD53NBL45
Hydroxyethyl cellulose is a plant-based thickening agent derived from cellulose. It helps control the texture and consistency of liquid or semi-solid medicines, and may also help keep ingredients evenly mixed throughout the product.
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UNII 3OWL53L36A
A natural sugar alcohol derived from seaweed or synthesized in the lab. It's used as a filler to add bulk, a sweetener in sugar-free formulas, and a disintegrant to help tablets break apart in the stomach.
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UNII 55X04QC32I
A strong alkaline chemical used to adjust and maintain the pH balance of liquid medicines. It helps keep the medicine stable and ensures it stays effective during storage.
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UNII B22547B95K
A salt derived from citric acid that helps maintain the proper acid-base balance in the medicine. It's used as a buffer to keep the product stable and at the right pH level.
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UNII 059QF0KO0R
Water is a liquid solvent that dissolves and mixes ingredients together in liquid medicines, syrups, and injections. It helps distribute the active drug evenly throughout the product.
5 inactive ingredients listed in the exact product block matched to this NDC.
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ingredient classCode="IACT" elements from the exact product block matched by this NDC. Label-section narrative from DailyMed / the openFDA label index is shown separately when available.Inactive ingredient FAQ
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💲 Pricing
A drug doesn't have one price. Each row is a different public payment system, and none is what you'd pay at the counter — that depends on your insurance. The ⓘ on each row explains what it measures.
| Price system | Per mL | Per package |
|---|---|---|
| Retail pharmacies payNADAC · weekly | Not in the retail survey — common for institutional, discontinued, or low-volume packs. | |
| Medicaid paysCMS SDUD · 12 mo | No recent Medicaid claims on file for this NDC — rare and low-volume NDCs are suppressed in the public data. | |
| Medicare drug plans payPart D · Q2 2026 | $1.75 | $63.02 / 36 ml |
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🔁 Therapeutic equivalents
| Product | Labeler | Pack | NADAC/unit | TE | Status | Price vs. this |
|---|---|---|---|---|---|---|
| Dorzolamide hydrochloride and timolol maleate 20 mg/mL; 5 mg/mL 50742-0323-60 | Ingenus | 12 pouches | $1.132 | AT2 | Availability likely | — |
| Cosopt Pf 20 mg/mL; 5 mg/mL 82584-0604-30 | Thea | 4 pouches | $3.301 | AT2 | Availability likely | — |
| Dorzolamide Hydrochloride And Timolol Maleate 20 mg/mL; 5 mg/mLthis 42571-0382-27 | Micro | 12 pouches | — | AT2 | FDA listed | — |
| Dorzolamide Hydrochloride and Timolol Maleate Preservative Free 20 mg/mL; 5 mg/mL 65862-0947-18 | Aurobindo | 12 pouches | — | AT2 | FDA listed | — |
| Dorzolamide Hydrochloride And Timolol Maleate 20 mg/mL; 5 mg/mL 72162-2387-06 | Bryant | 4 pouches | — | AT2 | FDA listed | — |
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⏳ Availability & generic status
This product is an FDA-approved generic. Other versions of the same drug are listed under Therapeutic equivalents, least expensive first.
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💊 Medicaid utilization by pack size
📦 Packaging — all sizes for this product
| Package NDC | Description | Per unit | Per pack | Marketing start | Status |
|---|---|---|---|---|---|
| 42571-0382-27 You're viewing this | 12 POUCH in 1 CARTON (42571-382-27) / 15 VIAL, SINGLE-USE in 1 POUCH / .2 mL in 1 VIAL, SINGLE-USE | — | — | 2022-03-23 | Active |
| 42571-0382-73 | 4 POUCH in 1 CARTON (42571-382-73) / 15 VIAL, SINGLE-USE in 1 POUCH (42571-382-71) / .2 mL in 1 VIAL, SINGLE-USE | $1.13 / ea | $67.92 | 2022-03-23 | Active |
This pack shows little to no recent Medicaid volume — a different pack size carries most fills. See all packs ↓
Pack size FAQ
What quantity is in NDC 42571-0382-27?
What NDC number is used to bill for this package of DORZOLAMIDE HYDROCHLORIDE AND TIMOLOL MALEATE 20 mg/mL; 5 mg/mL Solution/ Drops?
Prices are the latest CMS NADAC pharmacy acquisition cost per NDC; per-pack figures are per-unit × pack quantity, shown only when the pack is denominated in the same measure NADAC prices.
🧭 About this NDC listing & data coverage
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| NDC identity (package / product / labeler codes) | ✓ Available |
| Labeler | ✓ Available |
| Product & package description | ✓ Available |
| Marketing category & status | ✓ Available |
| Active ingredient / dosage form / route | ✓ Available |
| FDA label (SPL via DailyMed) | ✓ Available |
| Package photos | ✓ Available |
| Inactive ingredients (structured) | ✓ Available |
| NADAC pharmacy acquisition price (CMS) | — Not published for this NDC CMS publishes NADAC only for NDCs reported in its retail-pharmacy survey. |
| Orange Book / therapeutic-equivalence data | ✓ Available |
| HCPCS J-code billing crosswalk | — Not published for this NDC Most self-administered / retail products have no J-code — that is normal. |
| Medicaid utilization (CMS SDUD) | — Not published for this NDC CMS reports utilization only for NDCs with Medicaid claims above its privacy threshold. |
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📄 Full prescribing information FDA SPL
🎯 Indications and Usage ▾
1 INDICATIONS AND USAGE Dorzolamide hydrochloride and timolol maleate ophthalmic solution preservative free is indicated for the reduction of elevated intraocular pressure (IOP) in patients with open-angle glaucoma or ocular hypertension who are insufficiently responsive to beta-blockers (failed to achieve target IOP determined after multiple measurements over time). The IOP-lowering of dorzolamide hydrochloride and timolol maleate ophthalmic solution administered twice a day was slightly less than that seen with the concomitant administration of 0.5% timolol administered twice a day and 2% dorzolamide administered three times a day [see Clinical Studies (14.1) ].
Dorzolamide hydrochloride and timolol maleate ophthalmic solution preservative free is a combination of dorzolamide hydrochloride, a carbonic anhydrase inhibitor, and timolol maleate, a beta-adrenergic receptor inhibitor, indicated for the reduction of elevated intraocular pressure (IOP) in patients with open-angle glaucoma or ocular hypertension who are insufficiently responsive to beta-blockers. The IOP-lowering of dorzolamide hydrochloride and timolol maleate ophthalmic solution twice daily was slightly less than that seen with the concomitant administration of 0.5% timolol twice daily, and 2% dorzolamide three times daily.
( 1 )
⏱️ Dosage and Administration ▾
2 DOSAGE AND ADMINISTRATION The dose is one drop of dorzolamide hydrochloride and timolol maleate ophthalmic solution preservative free in the affected eye(s) two times daily. If more than one topical ophthalmic drug is being used, the drugs should be administered at least five minutes apart [see Drug Interactions (7.3) ]. The solution from one individual unit is to be used immediately after opening for administration to one or both eyes.
Since sterility cannot be maintained after the individual unit is opened, the remaining contents should be discarded immediately after administration. The dose is one drop of dorzolamide hydrochloride and timolol maleate ophthalmic solution preservative free in the affected eye(s) two times daily. ( 2 )
💊 Dosage Forms and Strengths ▾
3 DOSAGE FORMS AND STRENGTHS Ophthalmic solution containing 20 mg/mL dorzolamide (22.26 mg of dorzolamide hydrochloride) and 5 mg/mL timolol (6.83 mg timolol maleate). Ophthalmic solution containing 2% dorzolamide and 0.5% timolol. ( 3 )
⛔ Contraindications ▾
4 CONTRAINDICATIONS Dorzolamide hydrochloride and timolol maleate ophthalmic solution preservative free is contraindicated in patients with: Bronchial asthma or a history of bronchial asthma, severe chronic obstructive pulmonary disease. ( 4.1 ) Sinus bradycardia, second or third degree atrioventricular block, overt cardiac failure, cardiogenic shock. ( 4.2 ) Hypersensitivity to any component of this product. ( 4.3 , 5.3 )
4.1Asthma, COPD Dorzolamide hydrochloride and timolol maleate ophthalmic solution preservative free is contraindicated in patients with bronchial asthma, a history of bronchial asthma, or severe chronic obstructive pulmonary disease [see Warnings and Precautions (5.1) ].
4.2Sinus Bradycardia, AV Block, Cardiac Failure, Cardiogenic Shock Dorzolamide hydrochloride and timolol maleate ophthalmic solution preservative free is contraindicated in patients with sinus bradycardia, second or third degree atrioventricular block, overt cardiac failure, and cardiogenic shock [see Warnings and Precautions (5.2) ].
4.3Hypersensitivity Dorzolamide hydrochloride and timolol maleate ophthalmic solution preservative free is contraindicated in patients who are hypersensitive to any component of this product [see Warnings and Precautions (5.3) ] .
⚠️ Warnings and Cautions ▾
5 WARNINGS AND PRECAUTIONS Potentiation of Respiratory Reactions Including Asthma ( 5.1 ) Cardiac Failure ( 5.2 ) Sulfonamide Hypersensitivity ( 5.3 ) Obstructive Pulmonary Disease ( 5.4 ) Increased Reactivity to Allergens ( 5.5 ) Potentiation of Muscle Weakness ( 5.6 ) Masking of Hypoglycemic Symptoms in Patients with Diabetes Mellitus ( 5.7 ) Masking of Thyrotoxicosis ( 5.8 ) Renal and Hepatic Impairment ( 5.9 ) Impairment of Beta-Adrenergically Mediated Reflexes During Surgery ( 5.10 )
5.1Potentiation of Respiratory Reactions Including Asthma Dorzolamide hydrochloride and timolol maleate ophthalmic solution preservative free contains timolol maleate, a beta-adrenergic blocking agent; and although administered topically, is absorbed systemically. Therefore, the same types of adverse reactions that are attributable to systemic administration of beta-adrenergic blocking agents may occur with topical administration. For example, severe respiratory reactions, including death due to bronchospasm in patients with asthma, and rarely death in association with cardiac failure, have been reported following systemic or ophthalmic administration of timolol maleate [see Contraindications (4.1) and Patient Counseling Information (17) ].
5.2Cardiac Failure Sympathetic stimulation may be essential for support of the circulation in individuals with diminished myocardial contractility, and its inhibition by beta-adrenergic receptor blockade may precipitate more severe failure. In patients without a history of cardiac failure continued depression of the myocardium with beta- blocking agents over a period of time can, in some cases, lead to cardiac failure. At the first sign or symptom of cardiac failure, dorzolamide hydrochloride and timolol maleate ophthalmic solution preservative free should be discontinued [see Contraindications (4.2) and Patient Counseling Information (17) ].
5.3Sulfonamide Hypersensitivity Dorzolamide hydrochloride and timolol maleate ophthalmic solution preservative free contains dorzolamide, a sulfonamide; and although administered topically, it is absorbed systemically. Therefore, the same types of adverse reactions that are attributable to sulfonamides may occur with topical administration of dorzolamide hydrochloride and timolol maleate ophthalmic solution preservative free. Fatalities have occurred, although rarely, due to severe reactions to sulfonamides including Stevens-Johnson syndrome, toxic epidermal necrolysis, fulminant hepatic necrosis, agranulocytosis, aplastic anemia, and other blood dyscrasias.
Sensitization may recur when a sulfonamide is readministered irrespective of the route of administration. If signs of serious reactions or hypersensitivity occur, discontinue the use of this preparation [see Contraindications (4.3) and Patient Counseling Information (17)] .
5.4Obstructive Pulmonary Disease Patients with chronic obstructive pulmonary disease (e.g., chronic bronchitis, emphysema) of mild or moderate severity, bronchospastic disease, or a history of bronchospastic disease (other than bronchial asthma or a history of bronchial asthma, in which dorzolamide hydrochloride and timolol maleate ophthalmic solution preservative free is contraindicated) should, in general, not receive beta-blocking agents, including dorzolamide hydrochloride and timolol maleate ophthalmic solution preservative free [see Contraindications (4.1) and Patient Counseling Information (17)] .
5.5Increased Reactivity to Allergens While taking beta-blockers, patients with a history of atopy or a history of severe anaphylactic reactions to a variety of allergens may be more reactive to repeated accidental, diagnostic, or therapeutic challenge with such allergens. Such patients may be unresponsive to the usual doses of epinephrine used to treat anaphylactic reactions.
5.6Potentiation of Muscle Weakness Beta-adrenergic blockade has been reported to potentiate muscle weakness consistent with certain myasthenic symptoms (e.g., diplop…
🤒 Adverse Reactions ▾
6 ADVERSE REACTIONS The most frequently reported adverse reactions were taste perversion (bitter, sour, or unusual taste) or ocular burning and/or stinging in up to 30% of patients. Conjunctival hyperemia, blurred vision, superficial punctate keratitis or eye itching were reported between 5 to 15% of patients. ( 6 ) To report SUSPECTED ADVERSE REACTIONS, contact Micro Labs USA Inc. at 1-855-839-8195 or FDA at 1-800-FDA-1088 or www.fda.gov/medwatch .
6.1Clinical Trials Experience Because clinical trials are conducted under widely varying conditions, adverse reaction rates observed in the clinical trials of a drug cannot be directly compared to rates in the clinical trials of another drug and may not reflect the rates observed in practice. Dorzolamide Hydrochloride and Timolol Maleate Ophthalmic Solution and Dorzolamide Hydrochloride and Timolol Maleate Ophthalmic Solution Preservative Free Dorzolamide hydrochloride and timolol maleate ophthalmic solution and dorzolamide hydrochloride and timolol maleate ophthalmic solution preservative free were evaluated in patients with elevated intraocular pressure treated for open-angle glaucoma or ocular hypertension for up to 15 months.
Approximately 5% of all patients discontinued therapy because of adverse reactions. The most frequently reported adverse reactions occurring in up to 30% of patients were taste perversion (bitter, sour, or unusual taste) or ocular burning and/or stinging. The following adverse reactions were reported in 5% to 15% of patients: conjunctival hyperemia, blurred vision, superficial punctate keratitis or eye itching.
The following adverse reactions were reported in 1% to 5% of patients: abdominal pain, back pain, blepharitis, bronchitis, cloudy vision, conjunctival discharge, conjunctival edema, conjunctival follicles, conjunctival injection, conjunctivitis, corneal erosion, corneal staining, cortical lens opacity, cough, dizziness, dryness of eyes, dyspepsia, eye debris, eye discharge, eye pain, eye tearing, eyelid edema, eyelid erythema, eyelid exudate/scales, eyelid pain or discomfort, foreign body sensation, glaucomatous cupping, headache, hypertension, influenza, lens nucleus coloration, lens opacity, nausea, nuclear lens opacity, pharyngitis, post-subcapsular cataract, sinusitis, upper respiratory infection, urinary tract infection, visual field defect, vitreous detachment.
Other adverse reactions that have been reported with the individual components are listed below: Dorzolamide 2% Angioedema, asthenia/fatigue, bronchospasm, contact dermatitis, epistaxis, eyelid crusting, ocular discomfort, photophobia, signs and symptoms of ocular allergic reaction, transient myopia. Timolol (ocular administration) Body as a Whole: Asthenia/fatigue; Cardiovascular: Arrhythmia, syncope, cerebral ischemia, worsening of angina pectoris, palpitation, cardiac arrest, pulmonary edema, edema, claudication, Raynaud’s phenomenon, and cold hands and feet; Digestive: Anorexia; Immunologic: Systemic lupus erythematosus; Nervous System/Psychiatric: Increase in signs and symptoms of myasthenia gravis, somnolence, insomnia, nightmares, behavioral changes and psychic disturbances including confusion, hallucinations, anxiety, disorientation, nervousness, and memory loss; Skin: Alopecia, psoriasiform rash or exacerbation of psoriasis; Hypersensitivity: Signs and symptoms of systemic allergic reactions, including anaphylaxis, angioedema, urticaria, and localized and generalized rash; Respiratory: Bronchospasm (predominantly in patients with pre-existing bronchospastic disease); Endocrine: Masked symptoms of hypoglycemia in diabetic patients; Special Senses: Ptosis, decreased corneal sensitivity, cystoid macular edema, visual disturbances including refractive changes and diplopia, pseudopemphigoid, and tinnitus; Urogenital: Retroperitoneal fibrosis, decreased libido, impotence, and Peyronie’s disease.
6.2 Postmarketing Experience The following adverse reactions have been identified during…
🔄 Drug Interactions ▾
7 DRUG INTERACTIONS Potential additive effect of oral carbonic anhydrase inhibitor with dorzolamide hydrochloride and timolol maleate ophthalmic solution preservative free. ( 7.1 ) Potential acid-base and electrolyte disturbances. ( 7.2 ) Concomitant use with systemic beta-blockers may potentiate systemic beta-blockade.
( 7.3 ) Oral or intravenous calcium antagonists may cause atrioventricular conduction disturbances, left ventricular failure, and hypotension. ( 7.4 ) Catecholamine-depleting drugs may have additive effects and produce hypotension and/or marked bradycardia. ( 7.5 ) Digitalis and calcium antagonists may have additive effects in prolonging atrioventricular conduction time.
( 7.6 ) CYP2D6 inhibitors may potentiate systemic beta-blockade. ( 7.7 )
7.1Oral Carbonic Anhydrase Inhibitors There is a potential for an additive effect on the known systemic effects of carbonic anhydrase inhibition in patients receiving an oral carbonic anhydrase inhibitor and dorzolamide hydrochloride and timolol maleate ophthalmic solution preservative free. The concomitant administration of dorzolamide hydrochloride and timolol maleate ophthalmic solution preservative free and oral carbonic anhydrase inhibitors is not recommended.
7.2High-Dose Salicylate Therapy Although acid-base and electrolyte disturbances were not reported in the clinical trials with dorzolamide hydrochloride ophthalmic solution, these disturbances have been reported with oral carbonic anhydrase inhibitors and have, in some instances, resulted in drug interactions (e.g., toxicity associated with high-dose salicylate therapy). Therefore, the potential for such drug interactions should be considered in patients receiving dorzolamide hydrochloride and timolol maleate ophthalmic solution preservative free.
7.3Beta-Adrenergic Blocking Agents Patients who are receiving a beta-adrenergic blocking agent orally and dorzolamide hydrochloride and timolol maleate ophthalmic solution preservative free should be observed for potential additive effects of beta-blockade, both systemic and on intraocular pressure. The concomitant use of two topical beta-adrenergic blocking agents is not recommended.
7.4Calcium Antagonists Caution should be used in the coadministration of beta-adrenergic blocking agents, such as dorzolamide hydrochloride and timolol maleate ophthalmic solution preservative free, and oral or intravenous calcium antagonists because of possible atrioventricular conduction disturbances, left ventricular failure, and hypotension. In patients with impaired cardiac function, coadministration should be avoided.
7.5Catecholamine-Depleting Drugs Close observation of the patient is recommended when a beta-blocker is administered to patients receiving catecholamine-depleting drugs such as reserpine, because of possible additive effects and the production of hypotension and/or marked bradycardia, which may result in vertigo, syncope, or postural hypotension.
7.6Digitalis and Calcium Antagonists The concomitant use of beta-adrenergic blocking agents with digitalis and calcium antagonists may have additive effects in prolonging atrioventricular conduction time.
7.7CYP2D6 Inhibitors Potentiated systemic beta-blockade (e.g., decreased heart rate, depression) has been reported during combined treatment with CYP2D6 inhibitors (e.g., quinidine, SSRIs) and timolol.
7.8Clonidine Oral beta-adrenergic blocking agents may exacerbate the rebound hypertension which can follow the withdrawal of clonidine. There have been no reports of exacerbation of rebound hypertension with ophthalmic timolol maleate.
👥 Use in Specific Populations ▾
8 USE IN SPECIFIC POPULATIONS
8.1Pregnancy Risk Summary There are no adequate and well-controlled studies of dorzolamide hydrochloride and timolol maleate ophthalmic solution in pregnant women to inform a drug-associated risk. No evidence of teratogenicity has been observed in mice, rat, and rabbits with dorzolamide hydrochloride or timolol at clinically relevant doses [see Data]. Data Animal Data Oral administration of dorzolamide hydrochloride in pregnant rabbits at oral doses of ≥2.5 mg/kg/day (31 times the recommended human ophthalmic dose) revealed malformations of the vertebral bodies.
These malformations occurred at doses that caused metabolic acidosis with decreased body weight gain in dams and decreased fetal weights. No treatment-related malformations were seen at 1 mg/kg/day (13 times the recommended human ophthalmic dose). Oral administration of timolol in pregnant mice, rats and rabbits at does up to 50 mg/kg/day (7,000 times the systemic exposure following the maximum recommended human ophthalmic dose) demonstrated no evidence of fetal malformations.
Although delayed fetal ossification was observed at this dose in rats, there were no adverse effects on postnatal development of offspring. Doses of 1,000 mg/kg/day (142,000 times the systemic exposure following the maximum recommended human ophthalmic dose) were maternotoxic in mice and resulted in an increased number of fetal resorptions. Increased fetal resorptions were also seen in rabbits at doses of 14,000 times the systemic exposure following the maximum recommended human ophthalmic dose, in this case without apparent maternotoxicity.
8.2Lactation Risk Summary It is not known whether dorzolamide hydrochloride and timolol are excreted in human milk. Because many drugs are excreted in human milk, caution should be exercised when dorzolamide hydrochloride and timolol maleate ophthalmic solution is administered to a nursing woman. The developmental and health benefits of breastfeeding should be considered along with the mother’s clinical need for dorzolamide hydrochloride and timolol maleate ophthalmic solution and any potential adverse effects on the breastfed child from dorzolamide hydrochloride and timolol maleate ophthalmic solution.
8.4Pediatric Use The safety and effectiveness of dorzolamide hydrochloride ophthalmic solution and timolol maleate ophthalmic solution have been established when administered individually in pediatric patients aged 2 years and older. Use of these drug products in these children is supported by evidence from adequate and well-controlled studies in children and adults. Safety and efficacy in pediatric patients below the age of 2 years have not been established.
8.5Geriatric Use No overall differences in safety or effectiveness have been observed between elderly and younger patients.
🤰 Pregnancy ▾
8.1Pregnancy Risk Summary There are no adequate and well-controlled studies of dorzolamide hydrochloride and timolol maleate ophthalmic solution in pregnant women to inform a drug-associated risk. No evidence of teratogenicity has been observed in mice, rat, and rabbits with dorzolamide hydrochloride or timolol at clinically relevant doses [see Data]. Data Animal Data Oral administration of dorzolamide hydrochloride in pregnant rabbits at oral doses of ≥2.5 mg/kg/day (31 times the recommended human ophthalmic dose) revealed malformations of the vertebral bodies.
These malformations occurred at doses that caused metabolic acidosis with decreased body weight gain in dams and decreased fetal weights. No treatment-related malformations were seen at 1 mg/kg/day (13 times the recommended human ophthalmic dose). Oral administration of timolol in pregnant mice, rats and rabbits at does up to 50 mg/kg/day (7,000 times the systemic exposure following the maximum recommended human ophthalmic dose) demonstrated no evidence of fetal malformations.
Although delayed fetal ossification was observed at this dose in rats, there were no adverse effects on postnatal development of offspring. Doses of 1,000 mg/kg/day (142,000 times the systemic exposure following the maximum recommended human ophthalmic dose) were maternotoxic in mice and resulted in an increased number of fetal resorptions. Increased fetal resorptions were also seen in rabbits at doses of 14,000 times the systemic exposure following the maximum recommended human ophthalmic dose, in this case without apparent maternotoxicity.
🧒 Pediatric Use ▾
8.4Pediatric Use The safety and effectiveness of dorzolamide hydrochloride ophthalmic solution and timolol maleate ophthalmic solution have been established when administered individually in pediatric patients aged 2 years and older. Use of these drug products in these children is supported by evidence from adequate and well-controlled studies in children and adults. Safety and efficacy in pediatric patients below the age of 2 years have not been established.
🧓 Geriatric Use ▾
8.5Geriatric Use No overall differences in safety or effectiveness have been observed between elderly and younger patients.
🆘 Overdosage ▾
10 OVERDOSAGE Symptoms consistent with systemic administration of beta-blockers or carbonic anhydrase inhibitors may occur, including electrolyte imbalance, development of an acidotic state, dizziness, headache, shortness of breath, bradycardia, bronchospasm, cardiac arrest and possible central nervous system effects. Serum electrolyte levels (particularly potassium) and blood pH levels should be monitored. [See Adverse Reactions (6) .] A study of patients with renal failure showed that timolol did not dialyze readily.
🧬 Clinical Pharmacology ▾
12 CLINICAL PHARMACOLOGY
12.1Mechanism of Action Dorzolamide hydrochloride and timolol maleate ophthalmic solution preservative free is comprised of two components: dorzolamide hydrochloride and timolol maleate. Each of these two components decreases elevated intraocular pressure, whether or not associated with glaucoma, by reducing aqueous humor secretion. Elevated intraocular pressure is a major risk factor in the pathogenesis of optic nerve damage and glaucomatous visual field loss.
The higher the level of intraocular pressure, the greater the likelihood of glaucomatous field loss and optic nerve damage. Dorzolamide hydrochloride is an inhibitor of human carbonic anhydrase II. Inhibition of carbonic anhydrase in the ciliary processes of the eye decreases aqueous humor secretion, presumably by slowing the formation of bicarbonate ions with subsequent reduction in sodium and fluid transport.
Timolol maleate is a beta 1 and beta 2 (non-selective) adrenergic receptor blocking agent that does not have significant intrinsic sympathomimetic, direct myocardial depressant, or local anesthetic (membrane- stabilizing) activity. The combined effect of these two agents administered as dorzolamide hydrochloride and timolol maleate ophthalmic solution preservative free administered twice daily results in additional intraocular pressure reduction compared to either component administered alone, but the reduction is not as much as when dorzolamide administered three times daily and timolol twice daily are administered concomitantly. [See Clinical Studies (14) .]
12.3Pharmacokinetics Dorzolamide Hydrochloride When topically applied, dorzolamide reaches the systemic circulation. To assess the potential for systemic carbonic anhydrase inhibition following topical administration, drug and metabolite concentrations in RBCs and plasma and carbonic anhydrase inhibition in RBCs were measured. Dorzolamide accumulates in RBCs during chronic dosing as a result of binding to CA-II.
The parent drug forms a single N-desethyl metabolite, which inhibits CA-II less potently than the parent drug but also inhibits CA-I. The metabolite also accumulates in RBCs where it binds primarily to CA-I. Plasma concentrations of dorzolamide and metabolite are generally below the assay limit of quantitation (15nM).
Dorzolamide binds moderately to plasma proteins (approximately 33%). Dorzolamide is primarily excreted unchanged in the urine; the metabolite also is excreted in urine. After dosing is stopped, dorzolamide washes out of RBCs nonlinearly, resulting in a rapid decline of drug concentration initially, followed by a slower elimination phase with a half-life of about four months.
To simulate the systemic exposure after long-term topical ocular administration, dorzolamide was given orally to eight healthy subjects for up to 20 weeks. The oral dose of 2 mg twice daily closely approximates the amount of drug delivered by topical ocular administration of dorzolamide 2% three times daily. Steady state was reached within 8 weeks.
The inhibition of CA-II and total carbonic anhydrase activities was below the degree of inhibition anticipated to be necessary for a pharmacological effect on renal function and respiration in healthy individuals. Timolol Maleate In a study of plasma drug concentrations in six subjects, the systemic exposure to timolol was determined following twice daily topical administration of timolol maleate ophthalmic solution 0.5%. The mean peak plasma concentration following morning dosing was 0.46 ng/mL.
🧬 Mechanism of Action ▾
12.1Mechanism of Action Dorzolamide hydrochloride and timolol maleate ophthalmic solution preservative free is comprised of two components: dorzolamide hydrochloride and timolol maleate. Each of these two components decreases elevated intraocular pressure, whether or not associated with glaucoma, by reducing aqueous humor secretion. Elevated intraocular pressure is a major risk factor in the pathogenesis of optic nerve damage and glaucomatous visual field loss.
The higher the level of intraocular pressure, the greater the likelihood of glaucomatous field loss and optic nerve damage. Dorzolamide hydrochloride is an inhibitor of human carbonic anhydrase II. Inhibition of carbonic anhydrase in the ciliary processes of the eye decreases aqueous humor secretion, presumably by slowing the formation of bicarbonate ions with subsequent reduction in sodium and fluid transport.
Timolol maleate is a beta 1 and beta 2 (non-selective) adrenergic receptor blocking agent that does not have significant intrinsic sympathomimetic, direct myocardial depressant, or local anesthetic (membrane- stabilizing) activity. The combined effect of these two agents administered as dorzolamide hydrochloride and timolol maleate ophthalmic solution preservative free administered twice daily results in additional intraocular pressure reduction compared to either component administered alone, but the reduction is not as much as when dorzolamide administered three times daily and timolol twice daily are administered concomitantly. [See Clinical Studies (14) .]
📦 How Supplied / Storage and Handling ▾
16 HOW SUPPLIED/STORAGE AND HANDLING Dorzolamide Hydrochloride and Timolol Maleate Ophthalmic Solution, USP (Preservative Free) is supplied in a 0.2 mL low density polyethylene single-dose containers in a foil pouch containing 15 low density polyethylene 0.2 mL single-dose containers. Pouch label NDC 42571-382-71 Carton of 60 single-use containers NDC 42571-382-73 Carton of 180 single-use containers NDC 42571-382-27 Store dorzolamide hydrochloride and timolol maleate ophthalmic solution preservative free at 20 to 25°C (68 to 77°F).
Do not freeze. Store in the original pouch. After the pouch is opened, store the remaining single-dose containers in the foil pouch to protect from light.
Write down the date you open the foil pouch in the space provided on the pouch. Discard any unused containers 15 days after first opening the pouch.
📋 Description ▾
11 DESCRIPTION Dorzolamide hydrochloride and timolol maleate ophthalmic solution, USP (preservative free) is the combination of a topical carbonic anhydrase inhibitor and a topical beta-adrenergic receptor blocking agent. Dorzolamide hydrochloride, USP is described chemically as: (4 S-trans )-4-(ethylamino)-5,6-dihydro-6-methyl-4 H -thieno[2,3- b ]thiopyran-2-sulfonamide 7,7-dioxide monohydrochloride. Dorzolamide hydrochloride is optically active.
The specific rotation is: [α] 25°C (C=1, water) = ~ -17°. 405 nm Its empirical formula is C 10 H 16 N 2 O 4 S 3 •HCl and its structural formula is: Dorzolamide hydrochloride USP 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 USP 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°).
405 nm 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 USP 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.
Dorzolamide hydrochloride and timolol maleate ophthalmic solution, USP (preservative free) is supplied as a sterile, clear, colorless to nearly colorless, isotonic, buffered, slightly viscous, aqueous solution. The pH of the solution is approximately 5.65, and the osmolarity is 242 to 323 mOsM. Each mL of dorzolamide hydrochloride and timolol maleate ophthalmic solution, USP (preservative free) contains 20 mg dorzolamide (22.26 mg of dorzolamide hydrochloride) and 5 mg timolol (6.83 mg timolol maleate).
Inactive ingredients are mannitol, hydroxyethyl cellulose, sodium hydroxide, trisodium citrate dihydrate and water for injection. Dorzolamide hydrochloride and timolol maleate ophthalmic solution, USP (preservative free) does not contain a preservative. dorzolamidetimolol-stra.jpg structure2
💬 Information for Patients ▾
17 PATIENT COUNSELING INFORMATION Advise the patient to read the FDA-approved patient labeling (Patient Information and Instructions for Use). Potential for Exacerbation of Asthma and COPD Dorzolamide hydrochloride and timolol maleate ophthalmic solution preservative free may cause severe worsening of asthma and COPD symptoms including death due to bronchospasm. Patients with bronchial asthma, a history of bronchial asthma, severe chronic obstructive pulmonary disease should be advised not to take this product. [See Contraindications (4.1) .] Potential of Cardiovascular Effects Dorzolamide hydrochloride and timolol maleate ophthalmic solution preservative free may cause worsening of cardiac symptoms.
Patients with sinus bradycardia, second or third degree atrioventricular block, or cardiac failure should be advised not to take this product. [See Contraindications (4.2) .] Sulfonamide Reactions Dorzolamide hydrochloride and timolol maleate ophthalmic solution preservative free contains dorzolamide (which is a sulfonamide) and, although administered topically, is absorbed systemically. Therefore, the same types of adverse reactions that are attributable to sulfonamides may occur with topical administration, including severe skin reactions.
Patients should be advised that if serious or unusual reactions or signs of hypersensitivity occur, they should discontinue the use of the product and seek their physician's advice. [See Warnings and Precautions (5.3) .] Handling the Single-Dose Container Dorzolamide hydrochloride and timolol maleate ophthalmic solution preservative free is a sterile solution that does not contain a preservative. The solution from one individual unit is to be used immediately after opening for administration to one or both eyes. Since sterility cannot be maintained after the individual unit is opened, the remaining contents should be discarded immediately after administration.
Intercurrent Ocular Conditions Patients also should be advised that if they have ocular surgery or develop an intercurrent ocular condition (e.g., trauma or infection), they should immediately seek their physician's advice concerning the continued use of this product. Concomitant Topical Ocular Therapy If more than one topical ophthalmic drug is being used, the drugs should be administered at least five minutes apart. Manufactured by: Micro Labs Limited Bangalore- 560099, INDIA.
Manufactured for: Micro Labs USA, Inc. Somerset, NJ 08873 Rev. 04/2026