Imidapril

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Imidapril

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Medically reviewed

Laura Arias

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 Imidapril

What is Imidapril?

Imidapril is a pharmaceutical compound belonging to the class of medications known as Angiotensin-Converting Enzyme (ACE) inhibitors. It is primarily utilized in cardiovascular medicine to assist in the management of high blood pressure and certain related conditions.

Mechanism of Action

As an ACE inhibitor, imidapril works by interfering with the body's renin-angiotensin-aldosterone system (RAAS). It functions as a prodrug, meaning that after ingestion, it is converted by the liver into its active form, imidaprilat.

Imidaprilat inhibits the enzyme responsible for converting angiotensin I into angiotensin II. Angiotensin II is a potent substance that causes blood vessels to narrow and stimulates the release of hormones that increase water and salt retention. By reducing the production of angiotensin II, imidapril allows blood vessels to relax and widen, which helps to lower systemic blood pressure and reduces the workload on the heart.

Clinical Uses

Imidapril is most commonly indicated for the following conditions:

  • Hypertension: It is used to treat essential hypertension, helping to maintain blood pressure within a target range.
  • Renal Protection: In some clinical contexts, it is used to manage diabetic nephropathy, a type of kidney disease associated with diabetes, due to its ability to reduce pressure within the filtering units of the kidneys.
  • Heart Failure: It may be used as part of a broader management strategy for chronic heart failure to improve cardiac efficiency.

Chemical Properties

Chemically, imidapril is a dicarboxylate-containing ACE inhibitor. It is distinguished from some other members of its class by its specific molecular structure, which influences how it is metabolized and its duration of action within the body. It is typically administered orally and is absorbed through the gastrointestinal tract before being converted into its active metabolite.

What side effects are possible with Imidapril?

Possible Side Effects and Safety Information

The safety profile of Imidapril, an Angiotensin-Converting Enzyme (ACE) Inhibitor, is structured by regulatory authorities based on documented adverse reactions and specific usage constraints. Adverse effects are officially classified by frequency and grouped according to the physiological system or organ they affect, ensuring communication of risk is medically grounded and neutral.


Official Adverse Reaction Classifications

Most commonly reported adverse reactions listed in regulatory documents include a persistent Cough, Headache, Dizziness, Fatigue, and Hypotension (lowering of blood pressure). These effects are generally categorized within the Nervous System, Vascular, and Respiratory system-organ classes.

Serious Adverse Reactions are explicitly documented. The most significant concern highlighted is Angioedema, which involves swelling of the face, tongue, or airway and requires immediate attention. Other serious effects include Acute Renal Dysfunction or Failure, Hyperkalemia (elevated serum potassium), and severe Cutaneous Reactions (skin reactions).


Population-Specific Safety Statements

Official labels define specific safety constraints for certain patient groups. Imidapril is contraindicated during Pregnancy due to the risk of fetal injury. The medication is not recommended for patients with severe kidney impairment (creatinine clearance below a defined threshold) and requires close monitoring in cases of liver impairment or in older adults (who may have an increased risk of Hyperkalemia).

Safety notes also indicate that Severe Hypotension may occur after the initiation of therapy or following a dose increase. Furthermore, use is formally restricted in individuals with a history of Angioedema or during certain blood purification therapies.

Overdose and Emergency Response

Overdose and when to seek help

The official regulatory profile for Imidapril overdose, reflecting its classification as an ACE Inhibitor, centers on severe systemic manifestations resulting from an excessive pharmacological effect. The most anticipated clinical sign of overdose is profound hypotension (excessively low blood pressure), which may be accompanied by bradycardia (slow heart rate) or compensatory tachycardia (fast heart rate).


Life-Threatening Manifestations and Emergency Actions

Classification Manifestations and Actions (Official Regulatory Guidance)
Severe Outcomes Life-threatening angioedema (swelling of the face, throat, or tongue) is a documented risk, along with acute kidney injury (AKI) and severe hyperkalaemia.
Urgent Help Required Immediate medical attention or contact with emergency services is mandated upon suspicion of overdose, especially if profound hypotension or any sign of angioedema is present.

Supportive Management and Monitoring

Official regulatory documents state that no specific antidote is known. Management is symptomatic and supportive. Initial regulatory instructions for severe hypotension include placing the patient in the supine position and initiating intravenous fluid administration. Mandatory post-overdose care requires continuous monitoring of blood pressure, renal function, and serum electrolytes until the patient achieves hemodynamic stability.

Therapeutic Uses of Imidapril

What Imidapril Treats: Main Uses and Benefits

Imidapril is commonly used across domains where additional symptomatic support is needed for chronic cardiovascular and renal conditions. It helps address groups of symptoms that may intensify over time and create noticeable interference with daily stability. The medication is used for managing symptoms associated with essential hypertension, providing supportive relief for chronic heart failure, and addressing symptomatic manifestations in diabetic and chronic kidney conditions.

This medication's therapeutic application is relevant when supportive symptom management is appropriate for conditions marked by increased physiological stress. It is applied during phases of increased distress or discomfort associated with these long-term conditions. It provides support that helps ease the overall symptom burden and may help patients cope more steadily with symptom fluctuations.

“The medicine may assist with managing symptoms in contexts involving heightened systemic burden.”


Quick Fact: Relief for Heightened Symptoms Imidapril assists with maintaining functional stability and managing symptoms that create noticeable physiological strain in conditions characterized by periods of heightened symptoms.

Regulatory References

  1. ACE inhibitors: MedlinePlus Medical Encyclopedia

Eligibility and Restrictions for Use

Who Can and Cannot Use Imidapril? (Official Regulatory Information)

The population eligibility for Imidapril is defined by official regulatory bodies, establishing both absolute contraindications and conditional use restrictions. Imidapril is generally allowed for use in Adults being treated for documented conditions. However, the medicine is contraindicated and must not be used in several patient groups, including all Pregnant Women and Breastfeeding women due to the risk of fetal and neonatal injury.

Absolute Contraindications

The medicine is strictly prohibited for patients with a known Hypersensitivity to Imidapril or any other Angiotensin-Converting Enzyme (ACE) Inhibitor. Use is also contraindicated in patients with a history of Angioedema related to prior ACE inhibitor therapy. Furthermore, Imidapril is contraindicated in the Pediatric Population as safety and effectiveness in children have not been established. Patients with Severe Renal Impairment (Creatinine Clearance below 10 mL/min) or those undergoing Hemodialysis are also prohibited from using the medicine.

Conditional Use Restrictions

Certain populations require restricted or conditional use. Elderly Patients (65 years or older) and individuals with Hepatic Impairment or Renal Insufficiency (CrCl 30-80 mL/min) are eligible, but use is conditional, often requiring a restricted initial dose as stated in official labeling.

What should I know about interactions with other medicines?

Interactions with other medicines and products

The official regulatory profile for Imidapril, an ACE inhibitor, is characterized by several documented interaction risks and constraints.

Interaction Restrictions

Co-administration with Aliskiren is a strictly contraindicated combination in patients with Diabetes Mellitus or Renal Impairment. This restriction is due to the severe and increased risk of hyperkalemia, renal impairment, and hypotension.

Pharmacodynamic Effects and Exposure

Many interactions are driven by additive effects. The co-administration of Potassium-Sparing Diuretics, Potassium Supplements, or Potassium-Containing Salt Substitutes carries an increased risk of Hyperkalemia. Similarly, combining Imidapril with other Antihypertensive Agents, Tricyclic Antidepressants, or Alcohol may result in a pronounced, additive Hypotension.

From a pharmacokinetic standpoint, co-administration with Lithium increases its Serum Concentration and the potential for toxicity. The prodrug’s activation into its active form, Imidaprilat, can be reduced by agents like Rifampicin, altering systemic exposure. Interactions with Nonsteroidal Anti-inflammatory Drugs (NSAIDs) are associated with an increased risk of Renal Impairment.

Procedural and Food Constraints

Official labeling includes procedural constraints: Diuretics should be discontinued for two to three days before Imidapril therapy initiation to minimize initial hypotensive risk. Furthermore, Food is documented to decrease the overall bioavailability of Imidaprilat. Interaction severity is considered heightened in populations with pre-existing Renal or Liver Impairment.

Mechanism of Action

Imidapril is a pro-drug that is metabolized in the liver to its active moiety, Imidaprilat. This molecule functions as a competitive inhibitor of Angiotensin-Converting Enzyme (ACE), a key component of the Renin-Angiotensin-Aldosterone System (RAAS).

ACE is a zinc metalloprotease responsible for cleaving the inactive decapeptide angiotensin I to form the potent octapeptide angiotensin II. Imidaprilat binds to the active site of the ACE enzyme, thereby preventing this conversion. The resulting reduction in circulating angiotensin II concentrations leads to a corresponding decrease in its downstream effects, including reduced stimulation of aldosterone release from the adrenal cortex.

The inhibition of ACE also reduces the breakdown of bradykinin, a naturally occurring vasodilator peptide. The combined physiological consequence of reduced angiotensin II-mediated vasoconstriction and increased bradykinin activity is the modulation of vascular tone, leading to generalized vasodilation and a reduction in systemic peripheral resistance.

Dosage and Administration Information

Administration Scope

Instruction Detail
Route of administration The medication is for oral intake.
Dosing schedule (regulatory) Initial Dose (Hypertension): 5 mg once daily. Usual Maintenance: 10 mg once daily. Maximum Dose (Hypertension): 20 mg once daily. Maximum Dose (CHF/Proteinuria): 5 mg once daily.
Timing in relation to meals Must be taken 15 minutes before meals (on an empty stomach) to optimize drug absorption and consistency.
Age-group administration rules Older Adults (Age >65): The initial dose is reduced to 2.5 mg once daily, with the maximum dose limited to 10 mg once daily.
Missed-dose rules If a dose is missed, take it immediately unless it is almost time for the next scheduled dose, in which case the missed dose should be skipped; doubling the dose is not permitted.

Instruction Classifications (High-Level)

Classification Detail
Administration method type Oral (tablet form).
Frequency pattern Once daily (qDay) administration is the standard frequency.
Regulatory basis National regulatory authority prescribing information.
Use-context constraints Food intake constraint (pre-meal timing) and population-specific dose limits are defined by official labeling.

Resulting Procedural Structure

The official protocol establishes Imidapril as a medication administered orally on a once-daily schedule, with the instruction to take the dose before meals being a crucial condition for proper use. Regulatory documents standardize the initial and maintenance doses for adults, while also mandating dose adjustments for specific populations, such as older adults or those with impaired organ function. Dose titration should only occur after approximately three weeks if the initial regimen proves inadequate.

Recent Clinical Evidence

Research evidence / Overview of studies for Imidapril

Research exploring Imidapril has focused on four core areas: elevated blood pressure, supportive use in chronic heart failure, organ support in diabetic and chronic kidney conditions, and outcomes following a myocardial infarction. For managing elevated blood pressure, studies mainly utilized Randomized Controlled Trials (RCTs) to explore patterns related to short-term and intermediate-term changes in Systemic Blood Pressure and the stability of measured values over 24-hour periods.

In the context of chronic heart failure, studies often in smaller cohorts explored functional capacity, such as Exercise Capacity, and monitored physiological markers associated with heart function. Findings describe patterns in patient-reported outcomes, although the available data is generally focused on these functional results rather than long-term survival metrics specifically linked to this medicine.

Research also examined Imidapril in studies involving diabetic and chronic kidney conditions. These trials monitored markers of kidney function, specifically the Urinary Albumin Excretion Rate (microalbuminuria). A key limitation here is the reliance on these surrogate endpoints rather than final, long-term outcomes, such as preventing the need for dialysis.

A major limitation across the entire research landscape is the absence of large, long-term RCTs dedicated solely to Imidapril that focus on major clinical outcomes like heart attack or stroke. Understanding of these long-term outcomes is generally informed by the documented body of evidence from the entire ACE inhibitor class. Furthermore, evidence for certain groups, such as children or women who are pregnant, remains insufficient.

Frequently Asked Questions (FAQ)

Common questions about Imidapril (FAQ)

Q: Is Imidapril the same type of medicine as Lisinopril or Ramipril?

According to official drug classification, Imidapril is in the same pharmacological group as Lisinopril and Ramipril. All three medicines are classified as Angiotensin-Converting Enzyme (ACE) Inhibitors, meaning they share a similar mechanism of action to help manage blood pressure.


Q: Does Imidapril interact with common pain relievers like ibuprofen?

Regulatory documentation for ACE inhibitors states that using the medicine concurrently with Nonsteroidal Anti-inflammatory Drugs (NSAIDs), which includes ibuprofen, carries a documented risk. Regulatory warnings indicate that this combination is associated with an increased risk of kidney function impairment.


Q: Why is a persistent cough sometimes mentioned as a side effect of Imidapril?

Official medical literature indicates that the cough commonly associated with the ACE inhibitor class is thought to be linked to a substance called bradykinin. Medical literature suggests that the inhibition of the ACE enzyme may lead to the accumulation of this substance, which is hypothesized to cause the cough.


Q: Does Imidapril affect the way the liver works?

Yes, Imidapril is a prodrug, meaning it must be converted into its active form in the liver. For this reason, regulatory information states that dose adjustments or close monitoring are standard considerations for patients with documented liver impairment.


Q: Are there any specific foods or supplements that should be avoided with Imidapril?

Official labeling documents a specific constraint regarding supplements containing potassium. This includes potassium supplements or certain salt substitutes that use potassium chloride, due to a documented increased risk of high potassium levels in the blood.


Q: Why is Imidapril sometimes recommended after a heart event?

Imidapril is officially indicated for the management of chronic heart failure. This condition may follow certain heart events, such as a myocardial infarction. Research has focused on the supportive use of this drug class in clinical scenarios following a heart attack.


Q: Do other medications need to be taken at a different time from Imidapril?

Official product information documents a timing instruction that the medicine is administered about 15 minutes before a meal to optimize absorption. However, regulatory guidance does not define a general requirement for separating the administration of Imidapril from most other medications by time.


Q: How quickly should a person expect Imidapril to start working?

The effects on blood pressure begin following the medicine's absorption. Pharmacokinetic data indicates that the active form of the medicine reaches its peak concentration in the bloodstream approximately seven hours after a dose is taken.


Q: What is the difference between Imidapril and a beta-blocker?

These two types of medicine belong to entirely different drug classes. Imidapril is an ACE inhibitor that works by adjusting blood vessel tone and modulating the body’s hormonal system. In contrast, beta-blockers primarily function by reducing the heart rate and the force of the heart’s contraction.


Q: Is there a generic version of Imidapril available?

Imidapril is the international non-proprietary name (INN) for the active chemical compound. The medicine is marketed under various trade names globally, such as Tanatril, depending on the region and the specific manufacturer.


Q: How long does the effect of one dose of Imidapril usually last?

The effect is sustained for a long period, which corresponds with its once-daily administration schedule. Official pharmacokinetic studies show that the active form of Imidapril has a terminal half-life documented to be more than 24 hours.


Q: Do people who take Imidapril need to have regular blood tests?

Regulatory guidance for this class of medicine includes the consideration of periodic laboratory monitoring. This is typically done to check blood electrolytes, such as potassium, and to check markers of kidney function both before starting and during treatment.


Q: What is the name brand for the drug Imidapril?

Imidapril is the name of the active ingredient. The medicine is marketed by manufacturers under different commercial names around the world. One commonly known trade name for Imidapril is Tanatril.


Q: If a person stops taking Imidapril, does the effect wear off immediately?

The active medicine has a long terminal half-life of over 24 hours, which means the substance is cleared from the body gradually over an extended period. Due to its long half-life, the substance is cleared from the body over an extended period.

How should Imidapril be stored and disposed of?

How to Store and Dispose of Imidapril

Imidapril tablets must be stored according to official regulatory specifications to maintain product quality and safety.


Storage Requirements

Condition Requirement
Temperature Store at a temperature not exceeding 30°C.
Protection Must be protected from moisture and stored away from direct light and heat.
Container Keep the medicine in a tightly closed container.
Child Safety Must be kept out of the reach and sight of children.

Disposal Instructions

Unused or expired Imidapril must be disposed of in accordance with national and local requirements. The preferred disposal method in many regions is a drug take-back program. If no take-back program is available, the medicine should be mixed with an undesirable substance, placed in a sealed container, and then discarded in the household trash. Disposal via wastewater should be avoided.

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

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