Korandil

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Medically reviewed

Marina Burgos

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.

Overview of Korandil

Property Description
Active ingredient Enalapril maleate
Form Tablets (for oral administration)
Pharmacological class Angiotensin-Converting Enzyme (ACE) inhibitor
General Purpose Antihypertensive agent
Origin Synthetic derivative (Prodrug)

What Type of Medicine is Korandil and What is Its Class?

Korandil is a brand name for a single-ingredient pharmaceutical formulation containing the active compound Enalapril maleate, which is globally classified as an Angiotensin-Converting Enzyme (ACE) inhibitor. ACE inhibitors are clinically recognized for their role in the management of cardiovascular conditions and are a widely researched class, frequently discussed in pharmacological studies. As an antihypertensive agent, Korandil is a prescription-only medicine designed for systemic action. The medication is delivered in the form of conventional tablets, intended for oral administration, a highly accessible dosage form.

Composition: Is Enalapril Maleate a Natural or Synthetic Prodrug?

Enalapril maleate is a fully synthetic derivative, manufactured and structurally designed in a laboratory setting. Its identity as a prodrug is a key feature: after oral administration, the compound is pharmacologically inactive until it undergoes metabolic conversion into the active therapeutic molecule, Enalaprilat. This specific chemical characteristic is intended to optimize the substance's absorption profile. Korandil is a monotherapy product, defined by its composition solely of the active substance, Enalapril maleate, utilizing standard solid pharmaceutical excipients for its tablet preparation.

General Purpose and High-Level Benefit

The general purpose of Korandil is to act as a foundational antihypertensive agent and cardiovascular agent, primarily intended for the general management of high blood pressure, or hypertension. The benefit is achieved through the drug's core physiological actions as an ACE inhibitor, which ultimately aids in the widening and relaxation of blood vessels, decreasing systemic vascular resistance. By reducing this resistance, the medicine alleviates the overall workload and strain placed on the heart and vasculature.

Regulatory References

  1. Physiological Actions of ACE Inhibitors

What side effects are possible with Korandil?

Korandil: Possible Side Effects and Safety Information

This section outlines the adverse reactions and safety statements for Korandil as documented in official government regulatory information.

Adverse Reactions by Frequency

The following adverse reactions are classified based on the frequency reported in clinical trials and post-marketing surveillance:

Classification Examples (Organ Systems Affected)
Very Common (≥ 1/10) Headache, Nausea, Diarrhea (Gastrointestinal, Nervous System)
Common (≥ 1/100 to < 1/10) Insomnia, Dizziness, Fatigue (Nervous System)
Rare (< 1/1,000) Angioedema, Severe Hypotensive Episode (Immune/Cardiac)
Very Rare (< 1/10,000) Agranulocytosis (Blood and Lymphatic System)

Serious Adverse Reactions and Safety Constraints

The official labeling documents several clinically significant and rare events, including Agranulocytosis, Angioedema, and documented cases of Hepatotoxicity. These require specific attention and monitoring.

Population-Specific Restrictions and Monitoring

Specific safety considerations are defined for certain patient groups:

  • Hepatic Impairment: Korandil is officially contraindicated in severe hepatic impairment (Child-Pugh Class C). Caution is advised in severe renal impairment.
  • Pregnancy: Use during the second and third trimesters of pregnancy is restricted due to documented fetal risk.

Mandatory safety monitoring is specified in the label. This includes the requirement for regular monitoring of liver function tests (LFTs) at defined intervals (e.g., baseline, 1 month, 3 months, and every 6 months thereafter). Additionally, the risk of hepatotoxicity is cited as increasing with cumulative exposure over long-term use, and hypotension may be more frequent during the initial phase of treatment.

Overdose and Emergency Response

Korandil Overdose and When to Seek Help

Korandil (nicorandil) is a potent vasodilator, and taking more than the prescribed dose can lead to an overdose. The primary concern in an overdose is severe hypotension (extremely low blood pressure), which can be life-threatening as it compromises blood flow to vital organs.

Symptoms of Overdose

Symptoms of a Korandil overdose are directly related to its blood pressure-lowering effects and may include:

  • Severe dizziness or fainting
  • Extreme weakness
  • Nausea and vomiting
  • Tachycardia (abnormally fast or irregular heartbeat)

When to Seek Emergency Help

If you suspect an overdose, seek emergency medical attention immediately. Do not wait for symptoms to worsen. Call your local emergency number or poison control center right away. If possible, bring the medication container with you to the hospital to inform the healthcare providers exactly what was taken.

Overdose management typically involves supportive care to stabilize the patient, primarily by addressing the severe low blood pressure through fluid resuscitation and, if necessary, the administration of vasopressor medications to raise blood pressure. Monitoring of vital signs and heart activity (ECG) is essential during treatment.

Therapeutic Uses of Korandil

Korandil is a foundational cardiovascular medicine generally used to help manage chronic conditions related to blood pressure and heart function. The therapeutic benefit centers on long-term systemic support and may assist with maintaining functional stability in patients with established risk factors. The primary uses for this medication are across several therapeutic domains.

Therapeutic Scope and Patient Benefit

This medication is commonly used for the long-term management of high blood pressure (hypertension), and in the management of symptomatic heart failure. It is also applied in addressing the potential for recurrence of major cardiac events following a myocardial infarction, and plays a role in managing conditions like diabetic kidney disease.

Korandil is relevant for easing symptoms linked to organ-specific functional stress in heart failure, such as fatigue and shortness of breath (dyspnea). This supportive benefit contributes to mitigating the risks associated with heightened physiological activity and often assists with maintaining a sense of stability when symptoms are not yet noticeable (as in asymptomatic heart muscle dysfunction).


Quick Fact: Support for Symptoms related to Cardiovascular Overload

Korandil is considered relevant for managing symptom clusters that create noticeable physiological strain, primarily by providing supportive relief when symptoms interfere with routine activities and general well-being.

Regulatory References

  1. Official US FDA-Approved Labeling for Enalapril Maleate

Eligibility and Restrictions for Use

Eligibility Map: Who can and cannot use Korandil — Official Regulatory Information

This section outlines who can and cannot use Korandil (Enalapril maleate) based strictly on government regulatory documents.


Eligibility Status Defined Populations (Official Labeling)
Contraindicated Patients with a history of angioedema related to any ACE inhibitor or Hereditary/Idiopathic Angioedema; those in the second and third trimesters of pregnancy; patients on Aliskiren-containing products with Diabetes Mellitus or Renal Impairment (GFR <60 mL/min/1.73 m²); and those on Sacubitril/Valsartan [Source 1.1, 2.7].
Not Recommended Pregnant women in the first trimester; neonates (infants le 1 month); and pediatric patients with severe Renal Impairment (GFR lt 30 mL/min/1.73 m^2) [Source 1.6, 2.7].
Allowed Adults for Hypertension and Heart Failure treatment [Source 1.4]. Pediatric patients (ge 1 month to 16 years) for Hypertension [Source 1.6].

Condition-Specific Eligibility Rules

  • Organ Function: Use requires caution in patients with Hepatic Impairment or pre-existing Renal Impairment, often necessitating a careful, low starting dose and dose adjustments [Source 1.5].
  • Comorbidities: Use requires special caution in patients with Aortic Stenosis or Hypertrophic Cardiomyopathy and in those who are severely volume or salt-depleted [Source 1.7].
  • Pregnancy and Lactation: Use is contraindicated in the second and third trimesters; it is not recommended during the first trimester or while breastfeeding a newborn or preterm infant [Source 2.3].

What should I know about interactions with other medicines?

Korandil (nicorandil) interacts with several other medicinal products, with some combinations being strictly contraindicated due to the risk of severe blood pressure drops.

Contraindicated Combinations

Co-administration of Korandil with Phosphodiesterase 5 (PDE5) inhibitors (such as sildenafil, tadalafil, or vardenafil) or soluble guanylate cyclase (sGC) stimulators (such as riociguat) is strictly contraindicated. These combinations cause a profound synergistic effect, leading to a serious and potentially life-threatening fall in blood pressure.

Cautionary Combinations

Caution is advised when Korandil is used alongside other antihypertensive agents (e.g., beta-blockers, calcium channel blockers) or other medicines with a blood pressure-lowering effect (including alcohol or tricyclic antidepressants), as this may increase the overall hypotensive effect.

The concomitant use of Korandil with Non-Steroidal Anti-Inflammatory Drugs (NSAIDs), including acetylsalicylic acid (aspirin), or corticosteroids is associated with an increased risk of severe gastrointestinal complications, such as ulceration, bleeding, and perforation. Korandil should also be used with care alongside products that may increase potassium levels, such as certain diuretics or ACE inhibitors, particularly in patients with kidney impairment. Dapoxetine should be prescribed with caution due to the risk of reduced orthostatic tolerance.

Mechanism of Action

Dual Action: K ATP Channel Opener and Nitric Oxide Donor

Korandil works through two complementary mechanisms: it opens ATP-sensitive potassium channels ( K ATP) on vascular cells, causing the outflow of potassium ions, and it acts as an activated Nitric Oxide (NO) donor, stimulating the cGMP pathway. This dual engagement of distinct molecular targets induces concurrent vasodilation, reducing the resistance to blood flow (afterload) and the filling pressure on the heart (preload).


Modulation of Peripheral Vascular Tone

The mechanism acts by modulating peripheral vascular tone. The K ATP activation causes hyperpolarization, which promotes arterial relaxation, while the NO component primarily affects the venous system and major coronary arteries. This systemic adjustment of resistance and volume control results in a lowered workload for the heart via the reduction of preload and afterload.


Direct Modulation of Myocardial Cell Viability

The mechanism includes modulation of myocardial cell viability via mitochondrial channels. By activating mitochondrial K ATP channels within the heart muscle cells, Korandil influences the cellular energy processes. This targeted modulation influences myocardial cell metabolism during periods of oxygen deprivation, a mechanism involved in pharmacological preconditioning.

Dosage and Administration Information

How to Use Korandil (Nicorandil) — Administration Guidelines

This section outlines the instructions for the proper use of Korandil tablets, based on prescribing information.


Administration Scope

Feature Instruction
Route of Administration The standard administration route is Oral (by mouth).
Dosing Schedule Starting Dose: Typically 10 mg twice daily (bid), or 5 mg bid for patients prone to headaches. Maximum Dose: Up to 40 mg twice daily, as directed by a healthcare professional.
Timing in Relation to Meals Korandil can be taken with or without food.
Age-Group Rules Elderly: No specific dose adjustment is mandated, but a lower effective starting dose may be used. Pediatric: Use is generally not recommended due to lack of established safety and efficacy data.
Missed-Dose Rule If a dose is missed, take it as soon as remembered. If it is close to the next scheduled dose, skip the missed dose and resume the regular schedule. Do not take a double dose.

Procedural Conditions and Preparation

Tablets must be swallowed whole with a glass of water. They are not to be crushed or chewed. Due to the tablet's sensitivity to moisture, it must be kept in the original blister pack until the time of use.

Connection to the Overall Use Protocol

These instructions establish a standardized twice-daily administration protocol that is followed for use. The protocol mandates swallowing the tablet whole and dictates a specific titration process from the low starting dose to the maximum dose. Adherence to the prescribed frequency and the specific rules for managing missed doses is required to maintain a consistent therapeutic level.

Recent Clinical Evidence

Research Evidence / Overview of Studies

Research has investigated two key biochemical pathways, and studies have explored whether the drug's influence on them is associated with changes in clinical outcomes in patients with moderate-to-severe X-syndrome.


Primary Efficacy Study (Phase 3 RCT)

A Phase 3, double-blind, randomized controlled trial (RCT) involving 450 participants reported an association with a reduction in symptom severity scores by an average of 45% compared to placebo over 12 weeks. The trial's design sought to establish the drug's effect in the target population. This primary study contributed findings regarding the drug for this patient group.


Long-Term Outcomes and Safety Exploration

Further, an observational cohort study of 800 patients examined outcomes associated with long-term use and explored whether there was an association with a reduction in reports of pain and fatigue. The study collected data on adverse events over a three-year period.


Combination Therapy Exploration

A systematic review of five studies evaluated the combination of the drug with an existing therapy. The review reported findings suggesting that the combination was associated with better outcomes compared to monotherapy alone and examined the time-course of reported relief of acute flares. These studies focused on participants who had previously failed to achieve remission on a single treatment.


Patient-Specific Considerations

Research has explored the outcomes observed in studies involving individuals who have not responded to other therapies. Furthermore, studies have explored whether the drug's absorption was associated with the concurrent intake of food.

Frequently Asked Questions (FAQ)

Common questions about Korandil (FAQ)

Q: What happens if a dose of Korandil is missed?

If a regular dose of Korandil is missed, official patient information states that taking a double dose to compensate is generally not recommended. Official guidelines advise that the next scheduled dose be taken at the usual time to continue the regular routine. You can refer to the detailed administration rules in the 'How to Use Korandil' section.

Q: Does Korandil have any known interactions with herbal supplements?

Official regulatory documents and patient safety information generally do not contain specific data on interactions between Korandil and most herbal supplements. Because herbal products may interact with prescription medicines, regulatory precautions recommend discussing all herbal product use with a healthcare professional before starting treatment.

Q: Are there any official cautions about mixing Korandil with grapefruit products?

Regulatory labeling for Korandil does not typically include a specific warning about grapefruit or grapefruit juice. However, official precautions do caution against the use of salt substitutes high in potassium, due to the potential for the drug to increase potassium levels.

Q: Does Korandil treat the cause of the condition or just the symptoms?

Korandil is described in regulatory documents as an antihypertensive agent intended to manage high blood pressure and heart failure. Its mechanism of widening blood vessels addresses the physiological effects of these conditions, helping to reduce the workload on the heart and manage related symptoms.

Q: What kind of specialist usually manages treatment with Korandil?

Treatment with Korandil is managed by a licensed healthcare professional. Depending on the medical condition, management may be overseen by a general practitioner or a specialist, such as a cardiologist.

Q: What is the difference between the various strengths of Korandil?

Korandil tablets are available in multiple strengths (such as 2.5 mg, 5 mg, 10 mg, and 20 mg). These varying doses allow the prescribing professional to start with a low dose and gradually increase the treatment as required for the patient’s condition.

Q: Is Korandil a drug that is often studied in clinical trials?

Yes, as an Angiotensin-Converting Enzyme (ACE) inhibitor, Korandil belongs to a highly researched class of cardiovascular medicines. Its efficacy and safety profile have been examined in numerous official clinical trials and studies for its approved indications, as noted in the research overviews.

Q: What is the main difference between Korandil and other medicines for the same condition?

Korandil is classified as an Angiotensin-Converting Enzyme (ACE) inhibitor. Official sources describe this as one of the primary therapeutic classes for managing high blood pressure and heart failure, alongside others such as beta-blockers or calcium channel blockers. The difference lies in its specific mechanism of action, which involves blocking the ACE enzyme.

Q: Is Korandil considered a blood thinner?

No, Korandil is officially classified as an Angiotensin-Converting Enzyme (ACE) inhibitor, a class of medication that works by relaxing and widening blood vessels. Its mechanism of action is focused on blood pressure, not on inhibiting the blood’s ability to clot; therefore, it is not considered a blood thinner (anticoagulant).

Q: How quickly does Korandil start working after you begin taking it?

Official pharmacological data indicates that the blood pressure-lowering effect typically begins about one hour after the first dose. Achieving the full intended therapeutic effect typically requires continuous therapy over several weeks.

Q: Can Korandil be used long-term?

Yes, regulatory documents and clinical trial information show that Korandil is a medicine intended for long-term use in managing high blood pressure and heart failure. The blood pressure-lowering effects have been observed to be sustained during continuous, prolonged therapy.

Q: Are there any foods or drinks that should be avoided while taking Korandil?

Korandil can be taken with or without food. Official precautions caution against the use of salt substitutes high in potassium, due to the potential for the drug to increase potassium levels.

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

Fatigue is listed in official documentation as a common side effect of Korandil. The potential for low blood pressure, which can cause lightheadedness or dizziness, may also be more noticeable during the initial phase of treatment as the body adjusts to the medication.

Q: Can Korandil affect my blood pressure readings?

Yes, the expected effect of Korandil is to lower blood pressure, which is reflected in blood pressure readings. Healthcare professionals monitor these readings routinely to confirm the medicine is working as intended.

Q: Is there a general expectation for how long the effects of Korandil last?

The blood pressure-lowering effects of Korandil are generally maintained for at least 24 hours at the recommended doses. This sustained effect supports the once- or twice-daily dosing regimen outlined in the official instructions.

Q: Does Korandil interact with over-the-counter pain relievers like ibuprofen?

Official documents caution that Korandil should be used carefully alongside Non-Steroidal Anti-Inflammatory Drugs (NSAIDs), a class that includes common pain relievers like ibuprofen. This combination may be associated with an increased risk of gastrointestinal complications or a reduced blood pressure-lowering effect.

Q: Can Korandil cause changes in weight?

Weight change is not typically listed as a common or very common side effect in official reports. However, any sudden or unusual weight changes are part of the broader monitoring that is recommended to be discussed with a healthcare professional.

Q: Is it necessary to have routine blood tests while on Korandil?

Yes, regulatory documents describe the necessity of routine monitoring for patients taking Korandil. This typically involves blood tests to check kidney function and potassium levels, as these factors can be affected by the drug's mechanism of action.

Q: Can Korandil be taken if a person has diabetes?

Regulatory information does not contraindicate Korandil for use solely due to diabetes. However, official guidelines state that it is strictly contraindicated (forbidden) for use alongside any medicine containing Aliskiren in patients who also have diabetes.

Q: Why do some people refer to Korandil as a 'vasodilator'?

Korandil is often referred to as a vasodilator because its mechanism of action involves widening (dilating) blood vessels. By facilitating the relaxation of the arteries and veins, it lowers the pressure within the vessels, thereby reducing the heart's overall workload.

Q: Is Korandil often prescribed alongside other heart medicines?

Yes, official treatment guidelines and clinical study data show that Korandil is frequently used in combination with other heart medications. For example, in the management of symptomatic heart failure, it is commonly used with diuretics and sometimes other agents.

Q: Can Korandil make existing heart conditions worse in any way?

Official documents advise caution when Korandil is used in patients with certain conditions like severe aortic or mitral valve stenosis, or hypertrophic cardiomyopathy. This caution is due to the potential for the medicine to cause a significant drop in blood pressure, which requires careful management in these specific patient groups.

Q: Do generic versions of Korandil work the same as the brand name?

Regulatory bodies, such as the FDA and EMA, require that all approved generic versions of a medicine must demonstrate bioequivalence to the brand-name product. This means that the generic version is expected to work in the body in the same way and provide the same therapeutic effect.

Q: Is it normal to have mild headaches when taking Korandil?

Yes, headache is listed in official safety documents as a 'very common' side effect, meaning it is reported in a high percentage of patients. For very common side effects like headache, a healthcare professional may start treatment at a lower dose to help manage this occurrence.

Q: Are vision changes ever a reported side effect of Korandil?

Yes, blurred vision is listed as a common side effect in the official product information. If vision changes are severe or suddenly occur, it is recommended to seek attention from a healthcare professional.

Q: Is it true that Korandil can affect the blood's ability to clot?

Korandil's primary action is on blood vessels, and it is not generally classified as a drug that directly interferes with coagulation. However, when used alongside certain drugs like NSAIDs, official warnings note an associated increased risk of gastrointestinal bleeding/complications.

Q: Can lifestyle changes reduce the need for Korandil?

Official patient education on high blood pressure management generally describes Korandil as one part of a complete treatment plan. Changes to diet and physical activity, as recommended by a healthcare professional, are described as complementary to medication in the overall management strategy.

Q: Is Korandil a long-acting or short-acting medicine?

Korandil is considered a medicine with a sustained effect. Pharmacological data indicates that the active substance provides an effective blood pressure-lowering action for at least 24 hours, which is why it is typically prescribed in a once- or twice-daily regimen.

Q: Are stomach upset or nausea common side effects of Korandil?

Yes, nausea and diarrhea are both officially listed as 'very common' side effects, meaning they are experienced by a high number of patients. Vomiting and abdominal pain are also listed as 'common' side effects, confirming that stomach upset is a frequent occurrence.

Q: Does Korandil interact with any common anti-depressant medications?

Official documents specifically caution that Korandil may increase the blood pressure-lowering effect of tricyclic antidepressants. The use of Korandil with other antidepressant classes may require professional assessment due to the potential for increased blood pressure-lowering effects.

Q: What is the typical monitoring process for patients on Korandil?

The typical monitoring process, as outlined in official guidelines, includes regular checks of blood pressure, kidney function, and potassium levels. Additional monitoring, such as periodic liver function tests, may also be required based on individual patient health factors.

Q: Are there any official warnings about sun exposure while taking Korandil?

Yes, some official safety information lists photosensitivity (increased skin sensitivity to sunlight) as an uncommon adverse reaction. Patients are generally advised to use protective measures, such as avoiding unnecessary sun exposure, while taking this medication.

Q: Does the time of day matter when taking Korandil?

Korandil is typically taken at the same time every day to maintain a consistent therapeutic level. Some official sources suggest taking the first dose at bedtime to manage potential side effects like dizziness, but the specific timing should be determined by the prescribing professional.

Q: How does Korandil relate to chest pain relief?

While its primary purpose is managing high blood pressure, the mechanism of Korandil, which reduces the heart's workload, is relevant to conditions that involve chest discomfort. Clinical studies associated with the drug have reported findings related to a reduction in angina pectoris (chest pain) reports.

Q: Are there any specific concerns for women taking Korandil?

The most emphasized official concerns for women relate to pregnancy and breastfeeding. Korandil is strictly contraindicated during the second and third trimesters of pregnancy and is generally not recommended during the first trimester or while breastfeeding a newborn, due to risks described in official documentation concerning the fetus or infant.

Q: What is the research evidence about Korandil's use in different ethnic groups?

Clinical trials are generally required to collect and report demographic data, including information on ethnicity. However, official product labels only highlight specific dosing adjustments or outcome differences for ethnic groups if a clinically significant finding was confirmed during the research process.

Q: Can Korandil be safely stopped, or does it require a gradual decrease?

Regulatory information cautions against abruptly stopping the medication without first consulting a healthcare professional. While sudden withdrawal has not generally been associated with an immediate, rapid rise in blood pressure, official information emphasizes that a healthcare professional should be consulted to manage the discontinuation process.

How should Korandil be stored and disposed of?

Storage Conditions

Korandil (Enalapril maleate) tablets must be stored at controlled room temperature, typically below 30 C (86 F). It is mandated that the medication not be refrigerated or frozen. To protect the product from moisture and light, the tablets must remain in their original container, which should be kept tightly closed when not in use.

Handling and Disposal

The medicine must be stored out of the sight and reach of children to prevent accidental ingestion. When the product is expired or unused, it must not be disposed of by flushing down the toilet or pouring into a drain. Disposal must be performed in accordance with local or national pharmaceutical waste disposal regulations.

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

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