DORTIM-POS

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DORTIM-POS

Treatment option: Glaucoma

Medically reviewed

Marina Burgos

Last updated on 10/01/2026

This page provides general, reference-level information compiled from official medical sources. It is not a substitute for professional medical advice, diagnosis, or treatment. For decisions about your health, please consult a qualified healthcare professional.

Overview of DORTIM-POS

Property Description
Active ingredients Dorzolamide, Timolol
Form Ophthalmic solution (Eye drops)
Pharmacological class Carbonic Anhydrase Inhibitor and Beta-blocker (Fixed-dose combination)
General purpose Reduction of elevated intraocular pressure (IOP)
Origin Synthetic

1. DORTIM-POS: Definition and Pharmacological Classification

DORTIM-POS is defined as a synthetic, prescription-only, topical ocular preparation utilized for managing elevated fluid pressure within the eye. It is categorized as a fixed-dose combination (FDC) drug, incorporating two distinct active pharmaceutical ingredients into a single solution. This design for simultaneous administration is clinically recognized for promoting patient adherence compared to separate bottle regimens.

The preparation consists of two agents belonging to separate therapeutic classes: Dorzolamide, a Carbonic Anhydrase Inhibitor, and Timolol, a Beta-adrenergic Receptor Block or Beta-blocker. The selection of these two classes is characterized by their complementary mechanisms of action, a key differentiating factor from monotherapy options.

2. Composition and Drug Form: The Combination Approach

The active components in DORTIM-POS are Dorzolamide (as the hydrochloride salt) and Timolol (as the maleate salt). The product is manufactured as a sterile, buffered ophthalmic solution, often referred to as eye drops, intended strictly for topical ocular administration.

The advantage of this combination drug form is the unified application of both agents, which simplifies the treatment process. The specific formulation is utilized in scenarios requiring comprehensive intraocular pressure management, serving patients who require the sustained efficacy of a dual-mechanism approach.

3. General Purpose: Why the Dual Mechanism is Used

The overall and primary general purpose of DORTIM-POS is the significant and sustained reduction of elevated intraocular pressure (IOP). This objective is achieved through a dual mechanism of action where both Dorzolamide and Timolol work together to decrease the rate of production of aqueous humor, the internal fluid of the eye. This strategic combination functions to lower pressure. By consistently lowering pressure, the medication serves the essential function of mitigating the risk of structural damage within the eye.

Regulatory References

  1. Dorzolamide/Timolol DailyMed (NIH/NLM)

What side effects are possible with DORTIM-POS?

Possible Side Effects and Safety Information

The safety profile for DORTIM-POS, a fixed-dose combination of Dorzolamide and Timolol, is established through official regulatory documents and structured by the classification of adverse reactions. These effects are categorized by frequency and the organ system involved, reflecting both local ocular and systemic risks associated with the drug's components.

Frequency-Classified Adverse Reactions

Adverse reactions are classified based on the incidence reported in clinical trials, according to regulatory standards:

  • Very Common (affecting 1 in 10 or more people): Burning and stinging upon application, often most prominent at the start of treatment.
  • Common (affecting 1 to 10 in 100 people): Headache, conjunctival injection (redness), blurred vision, and a persistent bitter or unusual taste (dysgeusia).
  • Rare (affecting less than 1 in 1,000 people): Serious systemic reactions, including cardiac failure and bronchospasm, are documented, primarily linked to the Timolol (beta-blocker) component.

Key System-Organ Class Involvement

The most frequent adverse events occur in the Eye Disorders class. However, the regulatory safety profile also notes risks in Cardiac Disorders, Respiratory, Thoracic, and Mediastinal Disorders, and the Nervous System Disorders due to systemic absorption of the active ingredients.

Population-Specific Safety and Limitations

Official labeling outlines specific safety constraints. The drug is not recommended for use in patients with severe renal impairment due to the Dorzolamide component's excretion pathway. Furthermore, DORTIM-POS is contraindicated in individuals with pre-existing conditions such as bronchial asthma, severe chronic obstructive pulmonary disease (COPD), or specific severe heart conditions (e.g., sinus bradycardia, overt cardiac failure), owing to the risks posed by the Timolol component.

This structured information represents the officially documented safety profile, focusing solely on the possible side effects and regulatory limitations of the medicine.

Overdose and Emergency Response

The official regulatory documentation for DORTIM-POS details the potential for systemic overdose effects resulting from the absorption of the active components, Dorzolamide and Timolol. Manifestations of overdose may include central nervous system effects such as confusion, seizures, or trembling, alongside neuromuscular symptoms like paresthesia (numbness or tingling) and muscle cramps. Cardiovascular signs typically involve bradycardia (unusually slow heart rate) and hypotension (profound low blood pressure). Severe outcomes documented in official sources include overt cardiac failure, respiratory failure due to bronchospasm, and the development of a systemic acidotic state.

Regulatory guidance strictly mandates that individuals seek immediate medical attention by contacting a poison control center or emergency room at once in case of overdose or accidental oral ingestion of the solution. Urgent medical services must be contacted immediately if the affected person has collapsed, experienced a seizure, has severe trouble breathing, or cannot be awakened. Management of an overdose is primarily symptomatic and supportive, and regulatory labeling notes that monitoring of serum electrolyte and blood pH levels may be required. Caution is also noted for patients with severe renal or hepatic impairment due to the potential for increased systemic effects.

Therapeutic Uses of DORTIM-POS

Quick Facts

  • Therapeutic Domain: Ocular conditions
  • Primary Use: Management of elevated pressure within the eye (intraocular pressure)
  • Associated Conditions: Open-angle glaucoma and ocular hypertension
  • Benefit Profile: Helps to sustain normal intraocular pressure levels

DORTIM-POS is utilized for the management of elevated intraocular pressure (IOP) associated with certain eye conditions. These conditions include open-angle glaucoma and a related condition known as ocular hypertension.

Increased pressure within the eye may lead to gradual damage over time. The primary therapeutic objective of DORTIM-POS is to assist in lowering this pressure. By promoting the reduction of IOP, this medication offers a supportive role in maintaining the integrity of the ocular structure.

This combination medication is typically considered for individuals who require supplemental support to achieve target IOP levels, especially if they have not responded sufficiently to a beta-blocker treatment alone. The goal of this treatment is to help stabilize pressure and support long-term vision outcomes.

Eligibility and Restrictions for Use

Who Can and Cannot Use DORTIM-POS?

The eligibility for DORTIM-POS, a fixed-dose combination of Dorzolamide and Timolol, is strictly defined by regulatory authorities and based on specific systemic health criteria.

Absolute Contraindications

Use of this medicine is prohibited (contraindicated) for individuals with certain severe cardiac or respiratory conditions. These include bronchial asthma, history of asthma, severe COPD, overt cardiac failure, cardiogenic shock, and serious heart conduction disorders like second- or third-degree AV block or sinus bradycardia. It is also prohibited for those with known hypersensitivity to any component.

Age and Organ Function Restrictions

The safety and effectiveness of DORTIM-POS have not been established for children younger than 2 years of age. Use is not recommended in patients with severe renal impairment (Creatinine Clearance < 30 mL/min) due to the excretion of Dorzolamide. Conditional use (use with caution) applies to populations with hepatic impairment, diabetes mellitus (due to the potential masking of hypoglycemia signs), and Myasthenia Gravis.

Pregnancy and Lactation

Regulatory documents state that it is not known if or how the drug affects pregnancy. For breastfeeding women, the Timolol component passes into human breast milk, which restricts use during lactation.

What should I know about interactions with other medicines?

Interactions with other medicines and products

Official regulatory documentation identifies specific pharmacological and metabolic interactions that may alter the systemic effects of the Dorzolamide/Timolol combination.

Documented Interaction Patterns

Category Interaction Pattern (Official Label Description)
Pharmacodynamic Interactions The co-administration of oral Carbonic Anhydrase Inhibitors or systemic Beta-blockers (oral or topical) is not recommended due to the potential for additive systemic effects, including acid-base disturbances or marked bradycardia and hypotension.
Additive effects are documented when DORTIM-POS is co-administered with calcium antagonists, digitalis, or catecholamine-depleting drugs, potentially resulting in prolonged atrioventricular conduction or severe blood pressure lowering.
Metabolic Interactions Co-administration with known CYP450 2D6 inhibitors (e.g., Cimetidine, Quinidine, Fluoxetine) may diminish the clearance of the Timolol component, leading to increased systemic plasma concentrations and enhanced systemic beta-blockade.
Substance Interactions The co-administration of alcohol has a documented risk of additive effects in lowering blood pressure. High-dose salicylates may increase the risk of metabolic acidosis.

Regulatory Constraint

Use is not recommended in patients with severe renal impairment (creatinine clearance < 30 mL/min). This is a labeled constraint due to the accumulation of Dorzolamide and its metabolite, impacting overall drug clearance in this specific population. No mandatory timing-based separation rules are explicitly documented.

Mechanism of Action

How DORTIM-POS Works: Mechanism of Action


Dual Suppression of Aqueous Humor Formation

DORTIM-POS operates through two fundamentally distinct biological mechanisms: enzyme inhibition and receptor antagonism. This combination targets the fluid-producing tissue (ciliary body) by simultaneously suppressing two separate, rate-limiting steps in the active formation of aqueous humor.


Enzymatic Inhibition of Carbonic Anhydrase

The Dorzolamide component acts as an inhibitor of the enzyme Carbonic Anhydrase ( CA). This action disrupts the synthesis of bicarbonate ( HCO3^-) ions, which are essential for driving the osmotic movement of water and sodium into the eye chamber. The resulting physiological effect is a diminished volume of fluid secreted by the enzyme-dependent pathway.


Receptor Blockade of Sympathetic Fluid Drivers

The Timolol component works via non-selective antagonism of Beta-adrenergic Receptors (beta1 and beta2) on the ciliary epithelium. By blocking these receptors, the drug attenuates the signals from the sympathetic nervous system that mediate fluid formation. This mechanism results in an attenuated rate of active, receptor-driven fluid formation, which contributes mechanistically to the overall effect achieved by the enzymatic component.


Mechanistic Synergy and Physiological Outcome

The non-overlapping nature of these two independent mechanisms supports a combined effect on the overall rate of aqueous humor production. The core physiological consequence of this dual suppression is a diminished internal fluid pressure (IOP).

Dosage and Administration Information

DORTIM-POS is administered exclusively via the topical ocular route as an ophthalmic solution (eye drops) and is utilized for the sustained management of elevated pressure within the eye. The administration regimen is strictly defined to ensure consistent delivery of the fixed-dose combination.

Standard Administration Protocol

The official dosing for adults requires the instillation of one drop into the affected eye(s) two times daily (q12 h). This frequency pattern typically involves a morning and an evening application. If a dose is missed, it should be applied promptly; however, if the time for the next scheduled dose is near, the missed dose should be skipped to return to the regular q12 h schedule. The medication is intended for chronic, long-term use as part of an overall management plan.

Procedural and Population Requirements

To ensure proper administration, the user must follow specific procedural conditions. The dispenser tip should not contact the eye or any adjacent surfaces to maintain sterility and prevent contamination. A mandatory interval must be observed when using multiple topical eye medications; DORTIM-POS must be separated from any other solution by at least five to ten minutes. Furthermore, for pediatric patients, the same one-drop, twice-daily regimen is established for children 2 years of age and older. Single-unit containers, where applicable, are for immediate use only, and any leftover solution must be discarded after application.

Recent Clinical Evidence

Research evidence / Overview of studies for DORTIM-POS

Evidence for Use in Elevated Intraocular Pressure (IOP) in Glaucoma and Ocular Hypertension

DORTIM-POS was evaluated in research involving elevated intraocular pressure (IOP), which is associated with conditions like open-angle glaucoma and ocular hypertension. The core research includes large-scale, multi-center Randomized Controlled Trials (RCTs). These RCTs are a research design where groups of patients are randomly assigned to receive either DORTIM-POS, the individual components from separate bottles, or other types of medication. This research examined changes in IOP measurements following administration of DORTIM-POS across predetermined intervals, such as 6 weeks to 3 months.

Studies monitored and recorded IOP measurements at various time points, documenting the measured difference from baseline values. Additionally, research examined the measured IOP values for the fixed-dose combination versus the two active ingredients, Dorzolamide and Timolol, administered separately. Findings describe patterns observed in the studies regarding IOP measurements in the observed populations.

Studies contribute to understanding short-term changes in IOP measurements; however, data concerning long-term outcomes, such as visual field stability, often relies on smaller or observational settings with limited follow-up durations. Comparative evidence is lacking against some newer classes of glaucoma medications.


Studies Examining Use in Normal Tension Glaucoma (NTG)

DORTIM-POS was evaluated in a separate set of smaller clinical studies and observational settings for patients with Normal Tension Glaucoma (NTG). This condition was studied in research contexts involving fluctuating or unstable symptoms, where IOP is usually within the statistically normal range. Studies explored short-term symptom changes, focusing on episodes where symptoms become more noticeable.

These research scenarios primarily tracked IOP change from baseline and also monitored ancillary outcomes, such as the rate of visual field progression and certain ocular blood flow markers. The research exploring this specific patient population is derived from studies with modest sample sizes compared to the large trials for elevated IOP, meaning the results apply only to the populations studied.


The Research Landscape: Gaps and Uncertainties

The evidence base for DORTIM-POS includes multiple RCTs for research focused on elevated IOP. However, several research limitations are consistently noted. Long-term effects are not fully established; the follow-up durations were limited in the primary controlled trials, providing limited insight into multi-year outcomes. Data for certain groups remain insufficient, particularly those who were not well-represented in the pivotal trials.

Frequently Asked Questions (FAQ)

Common questions about DORTIM-POS (FAQ)


Q: How quickly should I expect DORTIM-POS to start working?

Clinical studies describe a sustained reduction in the eye pressure this medication is used to manage. The official product information indicates that the maximum pressure-lowering effect is typically observed a few hours after the first administration of the eye drop solution.


Q: Do the side effects of DORTIM-POS usually go away after a few weeks?

Official documents classify adverse reactions based on how often they occur in studies. The product labeling does not specifically state whether common initial effects, such as stinging or burning, will resolve within a fixed number of weeks.


Q: Is it safe to drink alcohol while taking DORTIM-POS?

Regulatory documents describe a documented risk of additive effects in lowering blood pressure when alcohol is co-administered with DORTIM-POS. This risk is noted in the medication's official interaction profile.


Q: Does DORTIM-POS interact with common pain relievers like ibuprofen?

Official regulatory documents specify a potential for interaction with high-dose salicylates (a type of pain reliever). The product labeling does not list non-salicylate pain relievers, such as ibuprofen or acetaminophen, as having documented interactions in the official medication profile.


Q: What if I start taking DORTIM-POS and then need to stop?

Regulatory warnings mention that, for patients undergoing elective surgery, caution is used, and some authorities describe a gradual withdrawal process for the beta-blocker component (Timolol) prior to the procedure.


Q: Do I need to take DORTIM-POS with food or on an empty stomach?

DORTIM-POS is administered only as a topical ophthalmic solution, meaning it is applied directly to the eye as drops. The official administration protocol is defined by frequency (twice daily) and does not contain any instructions related to food or meals.


Q: Is the effectiveness of DORTIM-POS supported by clinical trials?

Yes, regulatory approval is based on clinical trials. The core research includes large-scale Randomized Controlled Trials (RCTs) that were conducted to evaluate DORTIM-POS for the reduction of elevated intraocular pressure (IOP).


Q: What is the typical duration of treatment with DORTIM-POS?

DORTIM-POS is officially intended for chronic, long-term use as part of an overall plan for managing elevated intraocular pressure.


Q: Is DORTIM-POS a brand name or a generic medicine?

The active ingredients in DORTIM-POS are dorzolamide and timolol. This combination of ingredients is widely available both as a brand-name product and in a generic form, depending on the specific product distributed in your region.


Q: Can DORTIM-POS be used for conditions other than its approved uses?

DORTIM-POS is approved and indicated for the reduction of elevated intraocular pressure (IOP) in patients with open-angle glaucoma or ocular hypertension. The official regulatory label does not describe use for other medical conditions.


Q: What happens if I miss a dose of DORTIM-POS?

If a dose is missed, official regulatory information states it should be applied promptly. If the time for the next scheduled dose is close, the missed dose should be skipped to return to the regular twice-daily schedule.


Q: How long does DORTIM-POS stay in your system after taking it?

Regulatory documents note that DORTIM-POS is absorbed systemically after topical application. The Dorzolamide component and its metabolite are known to accumulate in red blood cells (RBCs) over time due to binding to the carbonic anhydrase enzyme.


Q: Is it common to feel tired or dizzy when taking DORTIM-POS?

Official documents classify dizziness as an uncommon side effect (affecting 1 to 10 in 1,000 people). However, the product label does not specifically list the general feeling of being 'tired' or 'fatigue' as a common or very common side effect.


Q: Are there any long-term side effects associated with DORTIM-POS use?

The official research summary notes that the primary controlled trials for DORTIM-POS had limited follow-up durations. Long-term outcomes and multi-year effects are not fully established by the initial controlled research, due to the limited follow-up duration of those pivotal trials.


Q: Can DORTIM-POS affect my mood or sleep patterns?

Official documents include depression as a rare adverse reaction associated with use. The label also contains warnings about the potential for mental or mood changes. Sleep patterns are not typically listed among the common adverse reactions.


Q: What are the most serious, but rare, side effects of DORTIM-POS?

Official regulatory documents describe rare but serious systemic reactions. These include examples such as cardiac failure and bronchospasm, which are primarily associated with the beta-blocker component (Timolol) of the drug.


Q: Does DORTIM-POS require any special monitoring or blood tests?

The official label advises that laboratory and medical tests should be performed periodically during the use of this medication. Official labeling advises that tests, such as eye examinations, may be performed during the period of use.


Q: Can I take DORTIM-POS if I am also taking supplements or vitamins?

Official patient counseling materials describe the importance of reporting all prescription and nonprescription medicines, as well as vitamins, nutritional supplements, and herbal products, to the prescribing healthcare provider.


Q: Are there any foods or drinks I should avoid while on DORTIM-POS?

The only substance interaction with DORTIM-POS listed in the official regulatory documents is with alcohol, due to a documented risk of additive effects in lowering blood pressure. No specific foods or non-alcoholic drinks are listed as required to avoid.


Q: Can DORTIM-POS cause problems with driving or operating machinery?

Official warnings advise that DORTIM-POS may cause temporary blurred vision immediately following application. Regulatory warnings describe that until vision is clear, activities such as driving or operating machinery should be avoided.


Q: Is DORTIM-POS addictive or habit-forming?

DORTIM-POS is not classified as a controlled substance by the Drug Enforcement Administration (DEA). Consequently, it is not formally labeled in regulatory documents as addictive or habit-forming.


Q: Are there any studies about DORTIM-POS use in older adults (seniors)?

Official regulatory information states that appropriate studies have been performed to date. These studies have not demonstrated geriatric-specific problems that would limit the usefulness of the medicine in older adults.


Q: Is it normal to feel a dry mouth or change in appetite on DORTIM-POS?

Official documents classify dry mouth as a rare adverse reaction associated with use. Changes in appetite, however, are not listed among the commonly reported side effects in the safety profile.


Q: Does DORTIM-POS contain any common allergens?

The active component Dorzolamide is a sulfonamide, a class of drugs that can cause allergic reactions in some individuals. Additionally, the product may contain the preservative benzalkonium chloride; the full list of inactive ingredients is provided in the regulatory labeling.


Q: What is the shelf life of DORTIM-POS?

The official regulatory information states that after first opening the bottle, the solution must be discarded after a specific period, often one month or as directed by the manufacturer, due to the risk of contamination. The overall shelf life of the unopened product is defined by the expiration date printed on the packaging.


Q: Are there any ongoing studies or new uses being researched for DORTIM-POS?

Government resources, such as the NIH’s clinical trial database, indicate that research has examined various aspects of the drug. This research has included investigating different methods of administration, such as the use of drug-loaded contact lenses.


Q: Is DORTIM-POS the first-line treatment option for the condition it treats?

Official regulatory information indicates that DORTIM-POS is indicated for the reduction of elevated intraocular pressure in patients who are insufficiently responsive to beta-blockers when used alone.


Q: Why is DORTIM-POS only available by prescription?

DORTIM-POS is classified as a prescription-only medicine because it is used to manage a serious medical condition (elevated IOP/glaucoma) and contains active ingredients. These ingredients require professional diagnosis and ongoing clinical oversight due to potential systemic adverse reactions and contraindications.


Q: What is the risk of overdose with DORTIM-POS?

Regulatory documents describe potential signs of overdose, which may include symptoms such as confusion, muscle cramps, numbness or weakness, seizures, and trembling. These are tied to the systemic absorption of the active ingredients.

How should DORTIM-POS be stored and disposed of?

DORTIM-POS ophthalmic solution should be stored at room temperature, typically between 15 C and 30 C (59 F and 86 F). It is essential to protect the medicine from light and to avoid freezing. Keep the bottle tightly closed in its original carton when not in use.

After first opening the bottle, the eye drop solution must be discarded after a specific period, often one month or as directed by the manufacturer, due to the risk of bacterial contamination which could lead to severe eye infections. Do not use the solution if it changes color or becomes cloudy.

For disposal, do not pour DORTIM-POS down the drain or flush it down the toilet unless specifically instructed. Unused or expired medication should be disposed of properly according to local guidelines or by returning it to a pharmacist or a drug take-back program. This practice prevents the medicine from harming the environment or people/pets.

Attention! Always consult to a doctor or pharmacist before using pills or medicines.

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