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Enicil Duo

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Enicil Duo

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Treatment option:

Medically reviewed

Rosario Oropesa

Last updated on 22/12/2025

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.

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Overview of Enicil Duo

Quick Facts

Property Description
Active ingredients Latanoprost and Timolol
Form Ophthalmic Solution (Eye Drops)
Pharmacological class Antiglaucoma preparation; Prostaglandin analogue/Beta-blocker combination
Primary purpose Enhanced Reduction of Intraocular Pressure (IOP)
Origin Synthetic/Derived

What Type of Medicine is Enicil Duo?

Enicil Duo is defined as a prescription-only ophthalmic solution belonging to the pharmacological class of antiglaucoma preparations. It is structurally a fixed-dose combination product containing the International Nonproprietary Names (INN) Latanoprost and Timolol, delivered in a single aqueous solution for topical ocular administration. This dual-agent formulation is clinically recognized for providing improved patient adherence and efficacy compared to the separate use of its individual components, which is a key differentiating factor in glaucoma management.

Latanoprost and Timolol: The Dual Composition

The product's core identity is its combination of two active ingredients [INN]: Latanoprost, a synthetic Prostaglandin F2alpha analogue, and Timolol (typically as Timolol maleate), a synthetic, non-selective Beta-blocker. This specific pairing is supported by pharmacological studies demonstrating their complementary mechanisms of action in the eye. The strategic blend of these two distinct pharmacological classes provides comprehensive pressure control, often utilized when monotherapy options have not been sufficient to reach the required target pressure.

The Primary Purpose of Enicil Duo

The primary therapeutic purpose of Enicil Duo is the enhanced, synergistic reduction of intraocular pressure (IOP). The combination ensures that pressure management is addressed on two fronts: Latanoprost increases the eye's fluid drainage through uveoscleral outflow, while Timolol simultaneously works by decreasing the production rate of the fluid (aqueous humor). This multi-target approach is the unique general benefit of the product, providing a robust and reliable method for maintaining consistently lower pressure levels.

Regulatory References

  1. Latanoprost Ophthalmic: MedlinePlus Drug Information
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What side effects are possible with Enicil Duo?

Possible Side Effects and Safety Information

The safety profile of Enicil Duo, a fixed-dose combination of Latanoprost and Timolol, involves potential adverse reactions related to both local ocular administration and systemic absorption of the beta-blocker component. The regulatory safety information classifies effects by frequency and the organ system involved.

Frequency-Classified Ocular and Systemic Effects

Side effects are categorized by their incidence as established in official regulatory documents:

  • Very Common (ge 1/10): Conjunctival hyperaemia (eye redness).
  • Common (ge 1/100 to < 1/10): Increased pigmentation of the iris (may be permanent), eye pain, blurred vision, and a stinging or burning sensation in the eye.
  • Uncommon (ge 1/1,000 to < 1/100): Headache, keratitis, and systemic effects such as bradycardia (slow heart rate) and dyspnoea (shortness of breath).

Systemic Risks and Safety Restrictions

Adverse reactions involving systems outside the eye are primarily attributed to Timolol's systemic absorption. Documented serious adverse reactions include fatal bronchospasm in susceptible patients and severe systemic cardiac events like cardiac failure, which are risks associated with ophthalmic beta-blockers.

The official labeling includes specific contraindications for patients with pre-existing conditions, such as bronchial asthma, severe chronic obstructive pulmonary disease (COPD), sinus bradycardia, or overt cardiac failure. The medicine should not be used in these populations.

Exposure-related patterns specify that the increase in iris pigmentation is associated with long-term use and is considered likely to be permanent, while changes to eyelashes are generally reversible upon discontinuation.

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Overdose and Emergency Response

Overdose and When to Seek Help

Overdose with Enicil Duo is primarily a concern due to the potential for significant systemic absorption of the Timolol component (a beta-blocker). The officially documented manifestations resulting from systemic exposure include symptomatic bradycardia (a very slow pulse rate), hypotension, and dizziness. Severe effects such as bronchospasm and acute cardiac failure are listed in regulatory documents as potentially life-threatening outcomes.

Mandated Emergency Actions

Immediate medical attention is required in the event of a suspected overdose, regardless of whether symptoms are immediately apparent. If accidental oral ingestion is suspected, patients must contact a healthcare practitioner, a regional poison control centre, or a hospital emergency department without delay.

Overdose Management and Risks

Management is symptomatic and supportive; for instance, gastric lavage may be considered for oral ingestion. It is documented that no specific antidote is known for systemic beta-blocker toxicity, and the Timolol component is not easily removed by hemodialysis. Regulatory documents advise caution regarding the risk of inadvertent overdosing in the elderly. Specific concerns exist for neonates and younger children due to the documented possibility of apnoea (cessation of breathing).

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Therapeutic Uses of Enicil Duo

What Enicil Duo Treats: Main Uses and Benefits

Enicil Duo is relevant in contexts marked by symptomatic discomfort, often used in areas where short-term symptom management is appropriate. The use of agents in this therapeutic category is considered relevant across domains where additional symptomatic support is needed, such as clinical settings that involve acute or unstable symptom patterns.


Management of Disruptive Symptom Clusters

It is commonly used to help with symptom clusters that may become intense or disruptive, especially in conditions characterized by periods of heightened symptoms. It is applied when groups of symptoms appear suddenly or fluctuate, leading to temporary functional strain. Enicil Duo provides support that helps ease the overall symptom burden.


Supporting Functional Comfort and Stability

Enicil Duo supports patients during episodes of heightened discomfort. It is relevant for easing symptoms related to physical discomfort and symptoms that create noticeable physiological strain, often used during phases when symptoms become more noticeable. This assistance supports the patient during difficult episodes by easing distress when symptomatic discomfort becomes overwhelming.


Quick Fact: Relief for Disruptive Symptom Clusters

Regulatory References

  1. NIH MedlinePlus overview on therapeutic agents of this class
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Eligibility and Restrictions for Use

Who can and cannot use Enicil Duo?

The population eligibility for Enicil Duo (Latanoprost and Timolol) is strictly determined by regulatory labeling, primarily due to the systemic effects of the Timolol component.


Absolute Contraindications (Must Not Use)

Population/Condition Regulatory Basis
Reactive Airway Disease Prohibited for patients with bronchial asthma, a history of asthma, or severe Chronic Obstructive Pulmonary Disease (COPD).
Severe Cardiac Conditions Prohibited for patients with sinus bradycardia, second or third degree AV block (uncontrolled by pacemaker), or overt cardiac failure.
Hypersensitivity Prohibited for patients with known allergy to Latanoprost, Timolol, or any other component.

Limitations and Conditional Use

Age Group/Status Official Eligibility Status
Children & Adolescents (< 18) Use is not established and not recommended.
Pregnancy Generally not recommended; use should be avoided.
Breastfeeding Should not be used.
Specific Eye Conditions Caution is required for patients with a history of Herpes Simplex Keratitis or those who are aphakic/pseudophakic with a torn lens capsule.

Enicil Duo is officially indicated for use in adults, including the elderly, provided they do not have any of the specific, absolute contraindications listed in the regulatory prescribing information.

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What should I know about interactions with other medicines?

Interactions with other medicines and products

The official interaction profile for Enicil Duo is primarily structured around the potential for additive pharmacodynamic effects resulting from the systemic absorption of its beta-blocker component, Timolol.

Interaction Scope and Restrictions

The regulatory labeling identifies several categories of medicines that may interact, leading to an exaggeration of effects on the heart rate and blood pressure:

  • Systemic Beta-Adrenergic Blocking Agents (Oral): Co-administration may result in additive effects on intraocular pressure reduction and known systemic beta-blockade effects, increasing the risk of hypotension or bradycardia.
  • Cardiovascular Agents: Substances such as Oral Calcium Channel Blockers, Antiarrhythmics (e.g., amiodarone), Digitalis Glycosides, and Rauwolfia Alkaloids carry the potential for additive effects resulting in marked bradycardia and/or hypotension.
  • Prostaglandin Restriction: The combination is not recommended for use concurrently with other Topical Prostaglandin Analogues as this combination is documented to risk a paradoxical elevation in intraocular pressure (IOP).
  • Other Topical Beta-Blockers: Concomitant use of two or more topical beta-adrenergic blocking agents is not recommended.

Population-Specific Notes

Due to the systemic effects of the Timolol component, the product may mask the signs and symptoms of acute hypoglycemia in diabetic patients. It may also mask the clinical signs of hyperthyroidism. No specific pharmacokinetic interactions with food, alcohol, or major metabolic enzymes are formally documented in the combination product's official label.

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Mechanism of Action

The core action of Enicil Duo relies on two distinct and additive mechanisms that modulate the fluid dynamics of the eye, influencing both inflow and outflow regulation.


Enhancing Fluid Drainage via FP Receptor Agonism

This domain focuses on Latanoprost, which acts as an agonist on the Prostaglandin F2alpha (FP) receptors in the ciliary muscle. Activation of these receptors initiates a cascade that physically remodels the tissue's extracellular matrix (ECM). This structural change reduces the resistance of the uveoscleral outflow pathway, leading to an increase in the rate at which aqueous humor is drained from the eye.


Reducing Fluid Production via Beta-Receptor Blockade

This domain covers Timolol's action as a non-selective antagonist (blocker) of beta1 and beta2 adrenergic receptors located in the ciliary epithelium. By inhibiting the binding of sympathetic signaling molecules, Timolol suppresses the intracellular cAMP pathway, which is vital for the active transport mechanisms that generate fluid. This molecular interference results in a reduced overall rate of aqueous humor production by the ciliary body.

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Dosage and Administration Information

Administration Guidelines

Enicil Duo is administered exclusively as a topical ophthalmic solution directly into the conjunctival sac of the affected eye(s). It is a fixed-dose combination product used according to a standardized schedule. The dosage is strictly limited to one drop per affected eye once daily. Exceeding this once-daily frequency is restricted, as studies indicate that more frequent administration may diminish the desired therapeutic effect. The instruction for administration is to use the eye drop, ideally, in the evening to achieve the optimal reduction in intraocular pressure.


Specific Usage Constraints and Procedures

Usage Rule Procedural Requirement
Dose Limit The dose must not exceed one drop per day. If a dose is missed, treatment should continue with the next scheduled dose as planned.
Co-Administration If using other topical ophthalmic drugs, they must be administered at least five minutes apart from Enicil Duo.
Contact Lenses Soft contact lenses must be removed before applying the drops and may be reinserted 15 minutes after the administration.

Population Use

The standard adult dosing regimen is applicable for older patients. However, the use of Enicil Duo in children and adolescents (under 18 years) is not generally recommended because the safety and effectiveness have not been established in this age group. The product is also restricted from use alongside other topical prostaglandin analogues or topical beta-blockers.

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Recent Clinical Evidence

Evidence for use in Reducing Eye Pressure (IOP)

The fixed combination of Latanoprost and Timolol was evaluated in numerous Randomized Controlled Trials (RCTs). These short-to-intermediate term trials were designed to examine the measurement of Intraocular Pressure (IOP) in adults with open-angle glaucoma or ocular hypertension. Research explored the use of the combination drops against a predefined study goal focused on influencing IOP measurements.


Comparator Studies

Studies explored the difference in mean daily eye pressure measurements between the fixed combination and the use of its two individual ingredients alone. Further systematic reviews explored how these drops were studied against other types of fixed combination therapies for eye pressure.


Patient-Focused Evidence: Adherence and Ocular Health

Beyond pressure measurement, observational studies monitored factors related to the patient’s experience, such as treatment adherence and persistence. Research also examined clinical signs and measurements related to ocular surface health.


Long-term Follow-up and Durability of IOP Measurements

Because these are chronic conditions, long-term open-label studies tracked outcomes for up to five years. These studies monitored IOP measurements recorded over the entire period, as well as the stability of the patient's visual field status.


Evidence in Specific Patient Groups

Research specifically examined IOP measurements recorded when patients switched to the fixed-dose combination due to high eye pressure being insufficiently controlled by prior monotherapy. Evidence is limited regarding the use of this fixed combination in pediatric populations, and research on its use in certain complex comorbidity groups may be limited in scope.


Research Gaps and Areas of Uncertainty

Most pivotal studies monitored IOP, which is a surrogate biomarker, rather than direct measurements of the preservation of functional vision. Certainty remains low when comparing this fixed combination against all newer therapies. Research does not determine whether an individual will respond similarly to the group patterns described in the studies.

Key Studies & References

  1. Fixed combination of latanoprost and timolol vs the individual components for primary open angle glaucoma and ocular hypertension: a systematic review and meta-analysis
  2. Public Assessment Report Scientific discussion Latanoprost and Timolol 50 microgram/5 mg/ml Eye Drops Solution (Example Regulatory Document for Established Efficacy)
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Frequently Asked Questions (FAQ)

Common questions about Enicil Duo (FAQ)


Q: How quickly can I expect to notice changes with Enicil Duo?

Studies and official information indicate that the pressure-lowering effect in the eye typically begins approximately 3 to 4 hours after you administer the drops. The maximum reduction in intraocular pressure (IOP) is generally observed within 8 to 12 hours of application. This characteristic of the medicine's onset is considered supportive in maintaining stable pressure throughout the 24-hour cycle.


Q: If I stop taking Enicil Duo, will I have withdrawal symptoms?

Regulatory documents suggest that if treatment is discontinued, the Timolol component may cause a rebound effect, resulting in a potential increase in intraocular pressure. The full therapeutic effect of the medicine may take about two weeks to entirely dissipate from the body. Regulatory information advises against making changes to the use of the medicine without consulting a healthcare professional.


Q: Does Enicil Duo affect blood pressure?

The beta-blocker component (Timolol) is absorbed into the bloodstream and can have systemic effects. Official warnings list the potential for effects on the heart and circulation, which may include a slow heart rate (bradycardia) or low blood pressure (hypotension). These effects are primarily noted in the official safety profile due to the nature of the drug components.


Q: Does Enicil Duo affect sleep patterns?

While the medicine's label does not specifically list 'sleep patterns' as an adverse reaction, the regulatory labeling for the Timolol component does include central nervous system (CNS) effects. These can include headache and somnolence (drowsiness) as possible uncommon reactions. These central nervous system effects are listed in the official safety documentation.


Q: Are there any common vitamins or supplements to avoid while taking Enicil Duo?

Official regulatory sources generally indicate that complementary medicines, herbal remedies, and nutritional supplements have not been adequately studied for interactions with Enicil Duo. For comprehensive safety monitoring, official guidance includes informing the prescribing doctor or pharmacist about all other products being used.


Q: Is there a listed interaction between Enicil Duo and grapefruit juice?

The official regulatory label for the combination product contains no formal documentation of a specific pharmacokinetic interaction between Enicil Duo and grapefruit juice. Information on drug interactions primarily focuses on other systemic and topical medications.


Q: Can people with kidney problems safely use Enicil Duo?

Official information advises caution and monitoring in patients who have pre-existing hepatic (liver) or renal (kidney) impairment. This is because the medication has not been adequately studied in these populations to determine necessary adjustments or specific risks. The need for close monitoring would be determined by a healthcare provider.


Q: Is the active ingredient in Enicil Duo addictive or habit-forming?

Regulatory documents for the combination product contain no mention of the drug being classified as a controlled substance. Additionally, the official labeling does not identify a specific risk of addiction or habit formation associated with the active ingredients.


Q: What is the difference between the brand name and the generic version of Enicil Duo?

Regulatory agencies require that generic versions contain the exact same active ingredients in the same strength as the brand name product. However, differences may exist in the inactive ingredients (known as excipients) or in the packaging, such as the design of the dropper tip.


Q: Is Enicil Duo meant to be taken at the same time every day?

The regulatory instruction is to use the drops once daily, ideally in the evening. This consistent, once-daily schedule is designed to support the maintenance of stable intraocular pressure control over a 24-hour period.


Q: Is a rash considered a normal reaction to Enicil Duo?

Official regulatory documents list localized rash as a rare side effect of the medicine. This means that a rash has been reported to occur in a very small percentage of patients who have used the drops.


Q: What is the usual treatment length for Enicil Duo?

The medicine is officially indicated for the management of chronic (long-term) conditions, such as elevated eye pressure or glaucoma. For this reason, treatment is typically considered to be long-term and may be continued for many years to maintain stable pressure levels.


Q: Can I take Enicil Duo with common over-the-counter pain relievers?

Official regulatory labeling does not formally document a direct interaction with common over-the-counter (OTC) pain relievers. Official guidance includes informing the prescribing doctor or pharmacist of all non-prescription medicines being used for comprehensive safety monitoring.


Q: Does Enicil Duo cause dry mouth?

Dry mouth has been reported as a common systemic side effect of the Timolol component of the medication. According to regulatory data, this side effect is typically observed in approximately 1% to 10% of patients using the drops.


Q: What is the full list of ingredients in Enicil Duo besides the active component?

In addition to the two active ingredients, the medicine contains inactive ingredients, which are known as excipients. These include the preservative benzalkonium chloride, sodium chloride, sodium phosphate buffers, and water for injections, used to stabilize the solution.


Q: Is Enicil Duo a pill that can be crushed or split?

Official documents clarify that Enicil Duo is only available as a topical ophthalmic solution (eye drops), and is not manufactured as an oral tablet or capsule. It must only be administered by dropping the solution directly into the eye.


Q: Is Enicil Duo available as a generic yet?

Regulatory bodies have approved generic forms of the individual active components (Latanoprost and Timolol). The market availability of the fixed-dose combination product itself is determined by patent status and manufacturer licensing agreements in specific regions.


Q: What were the main findings of the clinical trials for Enicil Duo?

Clinical trials and systematic reviews demonstrated that the fixed combination achieved a statistically significant reduction in mean diurnal intraocular pressure (IOP). Relative reductions in pressure were commonly reported in the range of 33% to 34% compared to baseline measurements.


Q: What types of liver issues are mentioned in the safety warnings for Enicil Duo?

The official regulatory safety profile does not list liver issues as a frequent or common adverse reaction. However, official information advises caution and close monitoring if a patient has pre-existing hepatic (liver) impairment before starting or continuing the medicine.


Q: What are the signs of a serious side effect from Enicil Duo?

Serious systemic risks are primarily associated with the Timolol component. These may include symptoms such as new or worsening chest pain, a very slow or irregular heartbeat, significant trouble breathing, or swelling of the limbs. These symptoms are listed in official documents as potential signs of a serious adverse reaction.


Q: Can I drive or operate machinery while adjusting to Enicil Duo?

Official documents state that visual disturbances, such as blurred vision, may affect the ability to drive or operate machinery. Patients should assess their vision before performing these tasks.


Q: Is it common to feel tired when first starting Enicil Duo?

The systemic effects associated with the Timolol component list fatigue as an uncommon side effect. This means the symptom is reported to occur in a small percentage of patients, specifically approximately 0.1% to 1%.


Q: Why is Enicil Duo sometimes prescribed alongside other medications?

The medicine is indicated for enhanced intraocular pressure (IOP) reduction in patients who were not sufficiently responsive to a single-ingredient drug (monotherapy). It may be used concomitantly (at the same time) with other topical ophthalmic drugs that are not specifically restricted by the official label.

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How should Enicil Duo be stored and disposed of?

Storage and Disposal Requirements for Enicil Duo

The storage of Enicil Duo (Latanoprost and Timolol Ophthalmic Solution) is subject to specific regulatory requirements based on whether the bottle is open or unopened.


Storage Conditions

  • Unopened: Store the bottle under refrigeration at 2 C to 8 C (36 F to 46 F). The product must not be frozen and should be protected from light.
  • In-Use: The opened bottle may be stored at a controlled room temperature up to 25 C (77 F) or may continue to be refrigerated.

Stability and Disposal

The medicine must be discarded six weeks (42 days) after first opening, regardless of how much solution remains. It must always be kept out of the sight and reach of children.

For disposal, the unused solution must not be thrown away via wastewater or household waste. Consult a pharmacist for instructions on proper pharmaceutical waste disposal.

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

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