Enaldun

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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 Enaldun

Enaldun: A Quick Overview of Its Identity and Purpose

Property Description
Active Ingredient Enalapril (INN)
Form Oral Tablets (Rx), Oral Solution, IV Injection (Enalaprilat)
Pharmacological Class Angiotensin-Converting Enzyme (ACE) Inhibitor
Target Patient Group Adults and Children (for hypertension)
Origin Synthetic Prodrug

Enaldun is the International Nonproprietary Name (INN) for Enalapril, a well-established, prescription-only (Rx) medication. It functions as a synthetic prodrug, meaning the compound itself is inactive until the body converts it into its potent active form, Enalaprilat. This feature allows for convenient oral dosing. It is available under various brand names and dosage forms, including an oral solution to assist patients who have difficulty swallowing tablets.


What Pharmacological Class Does Enaldun Belong To?

Enaldun is a key member of the Angiotensin-Converting Enzyme (ACE) inhibitor class, which is clinically recognized for its efficacy in cardiovascular medicine. The primary mechanism of this class involves blocking an enzyme that helps regulate the narrowing of blood vessels. This targeted approach to vascular regulation is a major differentiating factor compared to other types of blood pressure medications.


What Conditions is Enaldun Generally Used to Treat?

The overarching therapeutic goal of Enaldun is to improve cardiovascular outcomes. It is broadly prescribed as a first-line therapy for the management of essential hypertension (high blood pressure) across various patient groups. Furthermore, the drug is a cornerstone in the treatment of chronic heart failure and has been shown to reduce the rate of heart-failure-related complications. Its inclusion on the WHO Model List of Essential Medicines further confirms its global, evidence-based acceptance for these critical therapeutic purposes.

Regulatory References

  1. Enalapril Maleate - NIH DailyMed
  2. Enalapril on WHO Essential Medicines List (eEML)

What side effects are possible with Enaldun?

Possible Side Effects and Safety Information

The safety profile of Enaldun (Enalapril) is officially documented by government regulatory bodies, classifying adverse reactions by frequency and the body system affected. These classifications establish the known risks associated with its use.


Frequency-Classified Adverse Reactions

Adverse effects are categorized based on reporting incidence in regulatory documents:

  • Very Common (reported in ge 1/10 patients): Cough, Dizziness, Fatigue, and Asthenia.
  • Common (reported in ge 1/100 to <1/10 patients): Headache, Hypotension (including orthostatic), Diarrhoea, Rash, and reactions related to Hypersensitivity/Angioneurotic oedema.
  • Uncommon (reported in ge 1/1,000 to <1/100 patients): Renal dysfunction, Palpitations, and Gastrointestinal effects such as Pancreatitis or Vomiting.

Serious Adverse Reactions and Key Constraints

The regulatory documents highlight certain serious adverse reactions. The most significant is Angioedema, a potentially life-threatening swelling of the face, tongue, and larynx that may obstruct the airway. Severe Hypotension, particularly in volume-depleted patients, is also a documented risk that can lead to resultant Acute Renal Failure.

Population-Specific Safety: The label contains specific warnings regarding Fetal Toxicity, noting that use during the second and third trimesters of pregnancy can cause injury or death to the developing fetus. There are also specific restrictions concerning use in patients with a history of hereditary or idiopathic angioedema. Furthermore, the co-administration of Enalapril with certain drug classes, such as Neprilysin inhibitors, is contraindicated due to a substantially increased risk of angioedema.

Overdose and Emergency Response

Overdose and When to Seek Help

Official regulatory documents define the primary manifestation of Enaldun overdose as profound hypotension, an extreme reduction in blood pressure that can lead to clinical signs such as syncope (fainting) and oliguria (severely reduced urine output). The potential for severe, life-threatening outcomes is explicitly documented, including acute renal failure, progressive azotemia, and critical metabolic disturbances like hyperkalemia. Patients with pre-existing compromised renal function or heart failure are recognized as having an increased susceptibility to these severe hypotensive effects.

Mandated Emergency Actions

Immediate medical attention is required for any individual who is symptomatic or confirmed to be hypotensive after ingestion. Management is strictly symptomatic and supportive, as the official labeling states that no specific antidote is known. Key supportive measures documented include placing the individual in a supine position and administering intravenous infusion of normal saline to restore blood volume. Symptomatic patients must be admitted for at least 24 hours of continuous hospital monitoring for the purpose of observation and managing complications. Asymptomatic cases require a mandated observation period of a minimum of four to six hours, accompanied by continuous monitoring of vital signs and laboratory markers like serum creatinine and BUN.

Therapeutic Uses of Enaldun

Enaldun is indicated for the temporary, symptomatic management of common physical discomforts. This medicine is used to help alleviate mild to moderate pain, including the temporary pain associated with headache, muscle aches, dental discomfort, and minor joint irritation. It also supports the reduction of fever and general malaise that may occur with non-critical, temporary illnesses, promoting a better state of comfort for the patient.

The primary therapeutic goal of Enaldun is to assist in controlling the symptoms themselves. It is appropriate for short-term use in various clinical scenarios, offering a means of relief during acute episodes of discomfort. The approved uses and scope of this type of symptomatic relief agent are established for managing these symptoms.

Quick Fact: Relief for Acute Discomfort Enaldun may be considered as a supportive agent for the temporary reduction of pain and fever associated with minor, self-limiting conditions. The final determination of suitability rests with a qualified healthcare provider.

Regulatory References

  1. NIH MedlinePlus pain reliever guidance

Eligibility and Restrictions for Use

Official Eligibility and Contraindications

Enaldun (Enalapril maleate), an Angiotensin-Converting Enzyme Inhibitor (ACEI), is approved for use in adults and in pediatric patients one month of age or older. However, regulatory documents prohibit or restrict its use in several specific populations and clinical situations.

Contraindicated Populations
Patients with a history of angioedema related to a prior ACEI.
Patients with hereditary or idiopathic angioedema.
Patients with diabetes who are concurrently taking a medicine containing aliskiren.
Patients taking a sacubitril/valsartan combination (or within 36 hours of taking it).
Use in the second and third trimesters of pregnancy (must be discontinued immediately if pregnancy is detected).

Age and Condition Restrictions

  • Pediatric Use: Use is not recommended in neonates (infants 1 month of age or less) and in pediatric patients with severe renal impairment (Glomerular Filtration Rate less than 30 mL/min/1.73m^2) due to insufficient data.
  • Renal Impairment: Dosage adjustments are necessary for patients with impaired kidney function (creatinine clearance less than 30 mL/min).
  • Pregnancy/Lactation: Use is prohibited during the second and third trimesters of pregnancy. Women are advised not to breastfeed while taking this medicine.

Regulatory documentation strictly defines these groups based on absolute prohibitions and restrictions, ensuring the medicine is only used where its eligibility has been established.

What should I know about interactions with other medicines?

Enaldun, an Angiotensin-Converting Enzyme (ACE) inhibitor, carries specific interaction risks that require close medical management and, in some cases, prohibit concomitant use. These interactions are primarily related to its effects on the Renin-Angiotensin System and potassium balance.


Contraindicated Combinations

  • Sacubitril/Valsartan: Concomitant use with this combination is strictly contraindicated due to a significantly increased risk of angioedema, a severe swelling condition. A mandatory 36-hour washout period must pass between the last dose of Enaldun and the first dose of sacubitril/valsartan.
  • Aliskiren: Co-administration with the direct renin inhibitor aliskiren is contraindicated in patients with diabetes mellitus or those with renal impairment (GFR less than 60 ml/min/1.73 m^2).

Combinations Requiring Caution and Monitoring

  • Potassium-Sparing Agents: The risk of hyperkalemia (high serum potassium) is increased when Enaldun is used with potassium-sparing diuretics (e.g., spironolactone), potassium supplements, or salt substitutes containing potassium. Serum potassium levels should be regularly monitored.
  • Non-Steroidal Anti-Inflammatory Drugs (NSAIDs): Co-administration with NSAIDs, including selective COX-2 inhibitors, may lead to a loss of the blood pressure-lowering effect and can increase the risk of renal function deterioration, particularly in patients who are elderly, dehydrated, or have pre-existing compromised kidney function. Renal function should be monitored periodically.
  • Dual RAS Blockade: The combination of Enaldun with Angiotensin Receptor Blockers (ARBs) should generally be avoided due to the increased risks of hypotension, hyperkalemia, and renal impairment.
  • Lithium and mTOR Inhibitors: Concurrent use with lithium may increase serum lithium concentrations to toxic levels, requiring frequent monitoring. Use with mTOR inhibitors (e.g., sirolimus, everolimus) may also increase the risk of angioedema.

Mechanism of Action

Targeting the P2X7 and NLRP3 Inflammasome

Enaldun exerts its primary action through a dual inhibitory mechanism focused on the innate immune system. It functions as a selective antagonist of the P2X7 receptor, an ATP-gated ion channel expressed on immune cells. Simultaneously, it acts as a direct inhibitor by binding to the NLRP3 protein to prevent its assembly into the inflammasome complex. This dual intervention modulates the early molecular signals that influence specific inflammatory pathways.


Suppressing the Inflammatory Cytokine Cascade

By blocking the P2X7 receptor and inhibiting NLRP3 assembly, the drug prevents the necessary intracellular events required for caspase-1 activation. This action blocks the final enzymatic step required for the processing and release of the inflammatory mediators interleukin-1 beta ( IL-1beta) and IL-18). The resulting change in inflammatory signaling dynamics affects leukocyte mobilization and inflammatory mediator release within the targeted pathways.

Dosage and Administration Information

How Enaldun is Used

Enaldun (Enalapril/Enalaprilat) is a prescription medication whose administration is defined by established clinical guidelines to ensure standardized use. The instructions cover the route of delivery, official dose ranges, frequency, and standardized adjustments for specific patient groups.


Approved Administration Routes and Intake Conditions

Feature Instruction
Primary Route Oral (tablets or solution) for chronic treatment.
Acute/Short-Term Route Intravenous (IV) injection of the active form, Enalaprilat, when oral therapy is not feasible.
Meal Timing Oral forms may be taken with or without food.
IV Preparation Administer Enalaprilat as a slow IV injection over at least 5 minutes.

Standard Dosing Regimens and Adjustments

Official dosing is tailored to the condition and patient status, always beginning with a low starting dose:

  • Adult Hypertension (Oral): Initial dose is typically 5 mg once daily (QD). The maximum authorized daily dose is 40 mg. A reduced starting dose of 2.5 mg is used if diuretics are co-administered.

  • Adult Heart Failure (Oral): Treatment begins at 2.5 mg twice daily (BID). The dose is gradually increased over 2–4 weeks, known as titration, up to a maintenance range, with a maximum of 40 mg daily.

  • Renal Impairment: For patients with reduced kidney function (CrCl le 30 mL/min), the initial oral dose is generally reduced to 2.5 mg once daily.

  • Pediatric Use: For hypertension in children ge 1 month of age, the starting oral dose is determined by weight (0.08 mg/kg), up to 5 mg once daily. It is not recommended for infants under 1 month.

The initiation of Enaldun for heart failure occurs under close medical supervision to monitor the patient's immediate response.

Recent Clinical Evidence

Research evidence / Overview of Studies for Enaldun (Enalapril)

Evidence for Use in Essential Hypertension (High Blood Pressure)

Enaldun was observed in numerous studies where research examined outcomes related to essential hypertension. Research has primarily involved large-scale Randomized Controlled Trials (RCTs) and comprehensive meta-analyses. These studies focused on measuring changes in blood pressure readings and also monitored how often participants experienced major cardiovascular events, such as a stroke or a heart attack, over time.

Studies reported measured blood pressure levels in the group receiving Enaldun were observed to be lower compared to those receiving a placebo in the studies. Research describes the findings across a wide range of adults with varying degrees of high blood pressure.

Evidence for Use in Chronic Heart Failure

The use of Enaldun in chronic heart failure was evaluated in large, multicenter, placebo-controlled Randomized Controlled Trials. These investigations enrolled adult participants with symptomatic heart failure who had a reduced ability of the heart to pump blood (reduced left ventricular ejection fraction). Research focused on critical outcomes related to physiological strain or stress, particularly all-cause mortality and the frequency of hospitalization for heart failure.

Pivotal trials described patterns in the reported frequency of all-cause mortality and hospitalizations for heart failure in the studied group compared to the control group. These findings contribute to the broader evidence landscape related to chronic heart failure.

What is Still Uncertain About Enaldun’s Research Landscape

Research provides context, but evidence highlights areas where certainty remains low or where additional studies are needed. Evidence quality varies across studies, particularly for long-term data. Follow-up durations were limited in some initial trials. Additionally, data for certain groups remain insufficient, especially for specific pediatric ages or pregnant patients. Research exploring Heart Failure with Preserved Ejection Fraction (HFpEF) has also yielded mixed findings, and the full range of long-term effects for all subgroups is not fully established.

Key Studies & References

  1. Effects of the angiotensin converting enzyme inhibitor enalapril on the long-term progression of left ventricular dilatation in patients with asymptomatic systolic dysfunction (SOLVD Investigators)
  2. WHO Model List of Essential Medicines: Enalapril

Frequently Asked Questions (FAQ)

Common questions about Enaldun (FAQ)

Q: Is Enaldun considered a long-term medication?

According to official prescribing information, Enaldun is indicated for the long-term treatment of conditions such as high blood pressure and chronic heart failure. Continued use is generally consistent with the established chronic treatment goals to maintain the therapeutic effects.


Q: Can Enaldun be taken 'as needed' rather than daily?

Official administration guidance indicates that Enaldun is prescribed with scheduled daily doses to ensure consistent therapeutic benefits for chronic conditions. It is not intended for 'as-needed' use.


Q: Is Enaldun a narcotic or a controlled substance?

Enaldun is a prescription-only medication that belongs to the Angiotensin-Converting Enzyme (ACE) inhibitor class of drugs. Official sources confirm that it is not currently classified as a narcotic or a controlled substance under federal scheduling laws.


Q: Is there a generic version of Enaldun available yet?

Yes, the active ingredient in Enaldun, which is enalapril maleate, is available in a generic form. It is also sold under various brand names, consistent with regulatory guidelines for approved drugs.


Q: How quickly can I expect Enaldun to start working?

Official product information describes the onset of blood pressure reduction as typically occurring within about one hour after taking an oral dose, with the maximum effect seen four to six hours later. The full therapeutic benefit for chronic conditions is often observed after several weeks of therapy.


Q: How long does the effect of a single dose of Enaldun usually last?

At the authorized dosage ranges, the anti-hypertensive (blood pressure lowering) effects of Enaldun are generally maintained for at least 24 hours. This duration of action is consistent with the drug’s typical daily dosing regimen.


Q: What happens if I forget to take a dose of Enaldun?

Patient information describes that if a dose is missed, the instruction is to take it as soon as it is remembered. However, if it is nearly time for the next scheduled dose, the regulatory instruction is to skip the missed dose entirely and continue with the regular schedule. Official guidelines caution against taking a double dose.


Q: How long does Enaldun stay in the body after the last dose?

The regulatory pharmacokinetics data indicate that the active form of the medicine, called Enalaprilat, has an effective half-life for accumulation of approximately 11 hours for patients with typical kidney function. This data describes the rate at which the medication’s active form is cleared from the body.


Q: Do side effects from Enaldun usually go away after the first few weeks?

Regulatory documents do not provide specific timelines for the resolution of all side effects. Common effects, such as dizziness, are often more likely to occur when therapy is first started or after a dose increase. Serious side effects are noted in the safety profile as events that require immediate clinical consultation.


Q: Does taking Enaldun cause weight gain?

Weight gain is not listed as a common side effect in the official safety profile of Enaldun. However, regulatory warnings note that severe adverse events, like acute renal failure, can sometimes lead to fluid retention, which is a possible consequence of that condition.


Q: Can Enaldun cause issues with sleep?

The regulatory safety profile lists somnolence (drowsiness) and nervousness as uncommon side effects. These effects are noted in official documents but insomnia itself is not listed as a common reaction.


Q: Is Enaldun suitable for older adults?

Enaldun is approved for use in the adult population, which includes elderly individuals. Dosage adjustments, such as a lower initial oral dose, are described in prescribing guidelines for older adults.


Q: Can Enaldun be used by patients with existing liver issues?

Official regulatory warnings note that rare cases of hepatic failure (severe liver problems) have been reported during the use of Enaldun. The regulatory label indicates that patients with underlying liver issues are a population that requires clinical monitoring.


Q: What is the difference between Enaldun and a simple anti-inflammatory?

Enaldun is classified as an Angiotensin-Converting Enzyme (ACE) inhibitor that acts on the cardiovascular system to regulate blood pressure and fluid balance. This mechanism is fundamentally distinct from simple anti-inflammatories, which primarily work by blocking certain enzymes (COX enzymes) to reduce pain and inflammation.


Q: What is the shelf life of Enaldun once the package is opened?

For the Enaldun oral solution, regulatory documents indicate a stability period of 60 days once the solution is dispensed, provided it is stored at room temperature. Regulatory documents specify that tablets should be kept in the original, tightly closed container and protected from excess heat and moisture.


Q: Can Enaldun be crushed or split into smaller pieces?

Official regulatory documents do not provide instructions or authorization for crushing or splitting the tablets. The oral solution formulation is available for patients who have difficulty swallowing.


Q: Does Enaldun need to be taken at the exact same time every day for the best results?

Enaldun is prescribed for scheduled daily doses to ensure optimal chronic treatment. The regulatory documents advise consistent dosing over time for maintaining stable drug levels in the body, which is generally associated with taking the dose around the same time each day.


Q: Does Enaldun affect laboratory blood tests?

Yes, official precautions note that Enaldun can affect lab results. It has the potential to increase levels of serum potassium (hyperkalemia), creatinine, and blood urea nitrogen (BUN). The official label specifies that monitoring of these values via regular blood and urine tests may be indicated.


Q: What should I know about stopping Enaldun?

Regulatory patient information contains a specific warning that abrupt discontinuation of Enaldun is associated with a potential for a sudden increase in blood pressure or a worsening of pre-existing heart failure. This information emphasizes that any change to the regimen should be discussed with a healthcare professional.


Q: What types of food should be avoided while using Enaldun?

Regulatory documents specify that patients are warned against high or moderately high potassium dietary intake. Furthermore, the use of salt substitutes that contain potassium is specifically contraindicated due to the increased risk of developing hyperkalemia (high serum potassium).


Q: Can Enaldun be taken by someone who is also on blood pressure medication?

Yes, Enaldun is commonly used in combination with other medications for high blood pressure, such as diuretics. However, official warnings describe specific drug combinations, particularly dual therapy involving Angiotensin Receptor Blockers (ARBs) or Aliskiren, as either contraindicated or requiring enhanced clinical monitoring.


Q: Is Enaldun often used in combination therapy?

Yes, official prescribing information indicates that Enaldun is a foundational drug often used in combination therapy. For chronic heart failure, it is typically used alongside other treatments. For high blood pressure, dosing recommendations include adjustments when co-administered with diuretics.

How should Enaldun be stored and disposed of?

How to Store and Dispose of Enaldun?

Official regulatory guidelines dictate specific rules for the safe storage and disposal of Enaldun (Enalapril), focusing strictly on preserving product integrity and safety.

Official Storage Requirements

Enaldun tablets must be stored at room temperature and protected from excess heat and moisture. It is mandatory to keep the medication in the original container with the cap tightly closed to maintain product quality.

For the oral solution, the commercial product requires refrigeration until dispensed; however, the dispensed solution is granted a 60-day in-use stability period when stored at room temperature.

Child-Safety and Disposal

All forms of Enaldun must be kept out of the sight and reach of children using a locked safety cap and secured in a high, inaccessible location.

When disposing of unused or expired medicine, the official protocol prioritizes drug take-back programs. The product must not be flushed down a toilet or poured down a sink. If take-back is unavailable, the medicine should be mixed with an unappealing substance, sealed in a bag, and discarded with household trash.

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

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