Каптоприл

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Каптоприл

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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.

Overview of Каптоприл

What is Captopril?

Captopril is a pharmaceutical medication belonging to the class of drugs known as angiotensin-converting enzyme (ACE) inhibitors. Developed as one of the first oral medications in its class, it is primarily used in the management of cardiovascular and renal conditions.

Mechanism of Action

The medication works by interfering with the body's renin-angiotensin-aldosterone system (RAAS). It inhibits the enzyme responsible for converting angiotensin I into angiotensin II. Angiotensin II is a potent substance that causes blood vessels to narrow and promotes the retention of salt and water. By reducing the production of this substance, captopril allows blood vessels to relax and dilate, which helps to lower systemic blood pressure and reduces the workload on the heart.

Primary Uses

Captopril is utilized in several clinical contexts related to heart and vascular health:

  • Hypertension: It is used to manage high blood pressure, helping to prevent long-term complications associated with elevated arterial pressure.
  • Heart Failure: The medication assists in managing chronic heart failure by improving the heart's pumping efficiency and reducing fluid strain.
  • Post-Myocardial Infarction: It is often prescribed following a heart attack to improve survival rates and reduce the risk of further heart muscle weakening.
  • Diabetic Nephropathy: In patients with type 1 diabetes, captopril is used to manage kidney disease by slowing the progression of renal damage.

Physical Characteristics

As a chemical compound, captopril is a white to off-white crystalline powder that may have a slight sulfur-like odor. It is soluble in water and is typically manufactured in tablet form for oral administration. Because of its specific chemical structure, it is known for having a relatively rapid onset of action compared to some later-generation ACE inhibitors.

What side effects are possible with Каптоприл?

Possible Side Effects and Safety Information

Captopril's safety profile is documented by regulatory authorities, classifying potential effects by frequency and the body's system-organ class (SOC) involved. The official documentation identifies adverse reactions using standard categories such as Common, Uncommon, and Rare.

Adverse Reaction Classification

Classification Examples of Documented Effects
Common (ge 1/100 to < 1/10) Dizziness, altered taste (dysgeusia), dry persistent cough, rash, and pruritus.
Uncommon (ge 1/1,000 to < 1/100) Hypotension (low blood pressure), tachycardia, and chest pain.
Very Rare (< 1/10,000) Neutropenia/agranulocytosis, renal failure, and hepatic function disorder.

Serious adverse reactions are explicitly highlighted. The most critical is Angioedema, a rapid swelling of the face, tongue, or throat, which is listed as a serious, potentially life-threatening event. Other serious risks documented include neutropenia (a reduction in white blood cells) and rare cases of renal failure or severe hepatic impairment.

Regulatory Safety Constraints

The label defines specific safety considerations. Captopril is formally contraindicated during the second and third trimesters of pregnancy due to documented risk of fetal injury and death. It is also contraindicated in individuals with a history of ACE inhibitor-related angioedema or hereditary angioedema. For patients with impaired renal function, close monitoring of kidney health and serum potassium levels is required due to the risk of worsening conditions. A time-related pattern is noted for hypotension, which is typically more common at the initiation of therapy.

Overdose and Emergency Response

The official regulatory profile for Captopril overdose outlines severe physiological consequences that require immediate medical attention. Overdosage manifests primarily as an extreme extension of the medicine’s therapeutic effect.

Manifestations and Severe Outcomes Regulatory Description
Primary Clinical Manifestations Symptoms include severe hypotension, lethargy, and bradycardia. Physiological findings often show electrolyte disturbance.
Life-Threatening Outcomes The greatest risk of overdosage is the development of circulatory shock and acute renal failure.

Emergency Response and Management

In the event of a suspected overdosage, regulatory guidance mandates that patients seek immediate medical attention and contact a poison control center at once. Urgent medical help is necessary if the individual experiences collapse, a seizure, or trouble breathing.

As no specific antidote is known, overdose management is symptomatic and supportive. Procedures described in official documents include placing the patient in a supine position and administering fluids and sodium supplements immediately to manage hypotension. Severe cases may require interventions such as atropine administration, cardiac pacing, or the use of haemodialysis to remove Captopril from the circulation. Asymptomatic patients should be observed for a minimum of four hours with monitoring of vital signs and renal function.

Therapeutic Uses of Каптоприл

Main Uses and Benefits

Captopril, an angiotensin-converting enzyme (ACE) inhibitor, is commonly used across conditions presenting with acute episodes related to the cardiovascular system and kidneys. It assists in managing symptoms related to systemic imbalance and heightened physiological activity.

The core therapeutic domains of Captopril include the treatment of hypertension (high blood pressure), heart failure, and diabetic nephropathy (kidney disease caused by diabetes).

In clinical settings involving acute or unstable symptom patterns, Captopril is also considered relevant for easing symptoms linked to organ-specific functional stress following a heart attack in clinically stable patients. The use of Captopril is relevant when supportive symptom management is appropriate.

“Captopril is commonly used to help manage conditions where symptoms may intensify temporarily, and may provide support that helps ease the overall symptom burden.”

This medicine assists with maintaining functional stability and provides supportive relief when symptoms interfere with routine activities. It is applied across therapeutic domains where additional symptomatic support is needed.

Quick Fact: May assist with managing symptoms that create noticeable physiological strain.

Eligibility and Restrictions for Use

Eligibility Map: Who can and cannot use Captopril

The eligibility for Captopril is determined by formal regulatory classifications regarding patient health status and co-administered medications.


Contraindications (Must NOT Use)

Contraindicated Group Restriction Basis
Pregnancy (Second and third trimesters) High risk of fetal harm/death
Hypersensitivity Known allergy to Captopril or any ACE inhibitor
Angioedema History Previous angioedema related to ACE inhibitor therapy
Diabetic Patients Concurrent use with aliskiren (a direct renin inhibitor)
Neprilysin Inhibitors Concurrent use with drugs like sacubitril/valsartan (within 36 hours of switching)

Restrictions and Special Considerations

Restricted Group Eligibility Status
Pediatric Population Safety and efficacy have not been established
Renal Impairment Use should be reserved for patients who failed or cannot tolerate other therapies, especially those with underlying collagen vascular disease
Lactation Not recommended for use in newborns or premature infants; use in older infants requires close monitoring for adverse effects
Geriatric Patients More likely to have age-related kidney problems, potentially requiring dose adjustment

The regulatory profile for Captopril clearly defines several populations for whom its use is strictly prohibited, primarily due to severe risks such as fetal toxicity during pregnancy and the danger of angioedema. For certain other groups, including children, patients with impaired kidney function, and those who are breastfeeding, regulatory documents impose explicit use limitations or recommend caution, often requiring a reservation of the medicine for cases where alternatives are unsuitable. This structure outlines the specific constraints that govern a patient’s eligibility to be prescribed this medication.

What should I know about interactions with other medicines?

Interactions with other medicines and products

Official regulatory information for Captopril (an ACE inhibitor) defines specific contraindications and clinically significant interaction constraints, primarily centered on pharmacodynamic risks and effects on drug exposure. The most restrictive rules involve agents that affect the renin-angiotensin system and those that alter potassium levels.


Official Interaction Restrictions

  • Contraindicated Combinations: Captopril must not be co-administered with Sacubitril/Valsartan due to the high risk of angioedema. A mandatory 36-hour separation period is required when switching between these agents. Co-administration with Aliskiren is contraindicated in patients with diabetes mellitus or moderate to severe renal impairment (GFR < 60 mL/min).

  • Risk of Hyperkalemia: The use of Potassium-Sparing Diuretics (e.g., Spironolactone, Triamterene) or Potassium Supplements increases the risk of severe hyperkalemia (high serum potassium), an additive pharmacodynamic effect.

  • Exposure Alterations: Captopril reduces the renal clearance of Lithium, leading to increased serum concentrations and a risk of toxicity. Antacids and food may decrease the absorption of Captopril, requiring the medication to be administered on an empty stomach.

  • Antihypertensive Efficacy: Non-Steroidal Anti-Inflammatory Drugs (NSAIDs) can reduce the blood pressure-lowering effect of Captopril and increase the risk of renal function decline. Other antihypertensive agents can lead to additive blood pressure reduction and symptomatic hypotension.

Mechanism of Action

Captopril functions as a competitive inhibitor of Angiotensin-Converting Enzyme (ACE), also known as kininase II. This zinc-dependent metalloprotease is responsible for two primary biological reactions, both of which are modulated by Captopril's binding to its active site via a sulfhydryl moiety.

The first mechanistic cascade is the reduced conversion of Angiotensin I to the octapeptide Angiotensin II. Since Angiotensin II is a potent endogenous vasoconstrictor and a stimulator of aldosterone secretion from the adrenal cortex, the inhibition of its synthesis leads to decreased systemic vasoconstriction. The second action involves the impairment of the degradation of the vasodilator peptide bradykinin. The resulting elevation in local bradykinin levels further contributes to vasodilation.

Collectively, these molecular interactions lead to a systemic physiological consequence characterized by a reduction in total peripheral resistance and a decrease in sodium and water reabsorption via reduced aldosterone-mediated effects on the renal distal tubules. The modulation of the Renin-Angiotensin-Aldosterone System (RAAS) is the central pharmacological action.

Dosage and Administration Information

How to Use Captopril

Captopril is an orally administered medication, available as scored tablets in strengths of 12.5 mg, 25 mg, 50 mg, and 100 mg, intended for long-term management of chronic conditions. Usage protocols specify the route, frequency, and conditions for proper administration.

Dosing Frequency and Timing

The medicine is typically administered in divided doses, two or three times per day, due to its short duration of action. Instructions regarding the timing relative to food may vary:

  • In certain clinical protocols, it is stated that Captopril should be taken on an empty stomach, one hour before a meal, as food can reduce its absorption.
  • In other guidelines, it is noted that the medicine may be taken before, during, or after meals.

Standard Dosage and Titration

Therapy is initiated at a low starting dose (e.g., 6.25 mg or 12.5 mg) and gradually increased over time (titration). For hypertension, dose adjustments are often made at intervals of one to two weeks. The maximum recommended daily dose for Captopril in most indications is 450 mg/day.

Population-Specific Adjustments

Administration guidelines include special considerations for certain patient populations:

  • Renal Impairment: The initial daily dosage is reduced in patients with decreased kidney function, and titration steps are typically smaller and less frequent to prevent drug accumulation.
  • Pediatrics: Dosing is weight-based, typically calculated per kilogram of body weight.

Procedural Administration

If a dose is missed, it is generally taken as soon as remembered. However, if it is close to the time of the next scheduled dose, the missed dose is skipped, and a double dose is not taken.

Recent Clinical Evidence

The clinical evidence for captopril is based on extensive Randomized Controlled Trials (RCTs) and meta-analyses spanning several decades, primarily focusing on its approved uses in hypertension, heart failure, and diabetic kidney disease.

Evidence for Established Uses

For high blood pressure, research has consistently monitored changes in both Systolic and Diastolic Blood Pressure (BP) and tracked the incidence of major cardiovascular events. Studies report patterns related to the overall blood pressure profile, though comparative evidence against newer medications sometimes yields mixed findings depending on the patient group studied.

In managing heart failure and post-heart attack recovery, large-scale, placebo-controlled trials, such as the SAVE Trial, are central to the evidence base. These studies focused on stable patients with left ventricular dysfunction (LVD), monitoring critical outcomes like patient survival and the occurrence of congestive heart failure (CHF) over long-term follow-up periods, such as a median of 42 months.

For diabetic kidney disease (nephropathy), controlled trials explored patterns related to the excretion of protein in the urine (albuminuria) and tracked the rate of decline of kidney function markers over medium-term periods, typically around three years. Early studies in this area were sometimes characterized by limited follow-up durations.

Follow-up Durations and Uncertainties

The key RCTs established multi-year follow-up durations, which contributes to the broader evidence landscape for chronic conditions. The short-acting characteristic of the compound was observed in some studies that examined long-term outcomes. Data are still emerging regarding continuous comparative outcomes against many newer therapies, and the long-term effects of Captopril are not fully established regarding outcomes over multiple decades. Key limitations in the research include that results apply only to the specific populations studied, and certainty remains low in certain specialized subgroups.

Frequently Asked Questions (FAQ)

Common questions about Каптоприл (FAQ)


Q: Why is Каптоприл sometimes given with a diuretic ('water pill')?

Regulatory information describes that combining Captopril with certain diuretics provides an additive effect in lowering blood pressure. Studies indicate that this combination may offer favourable effects on the body’s fluid and salt balance compared to using the diuretic alone, supporting its use in some patients.


Q: Is it true that Каптоприл can affect the kidneys?

Yes, official documents state that Captopril is approved for use in managing diabetic nephropathy (a specific type of kidney disease in diabetic patients). However, the medication is also associated with rare, serious effects such as renal failure, and dose adjustments are explicitly required for patients with reduced kidney function. This dual consideration highlights why kidney health monitoring is often part of professional care during use.


Q: Are there any common foods or drinks that interact with Каптоприл?

The most significant food-related caution noted in official documents is related to potassium. Captopril is associated with an increased risk of high potassium levels in the blood (hyperkalemia). Therefore, official sources note that the use of salt substitutes or high potassium dietary intake may increase this risk and is typically used with caution.


Q: Can people with diabetes safely use Каптоприл?

Yes, Captopril is approved for use in treating diabetic nephropathy (kidney disease related to diabetes) due to its benefits in helping to slow the decline of kidney function. However, official safety restrictions strictly contraindicate its use when combined with the drug aliskiren in patients who have diabetes.


Q: Can I use cough and cold medicines while taking Каптоприл?

Regulatory safety information indicates that certain ingredients found in over-the-counter cough and cold medicines, particularly decongestants, may increase blood pressure and heart rate. Because Captopril is used to manage high blood pressure, these ingredients are noted as potentially interfering with the blood pressure lowering effect.


Q: Why is it recommended to use caution with high-potassium foods while taking Каптоприл?

Official documentation notes that Captopril belongs to a class of medicines associated with a risk of elevated potassium levels in the blood, known as hyperkalemia. This caution is noted because combining the medication with high-potassium foods or supplements may increase this risk further.


Q: Can Каптоприл be split or crushed for easier administration?

The medication is manufactured as tablets that are officially described as scored. While the presence of a score line is noted, regulatory documents do not contain explicit general instructions permitting or forbidding the splitting or crushing of all scored tablets.


Q: Can I use alcohol while taking Каптоприл?

Official interaction information indicates that Captopril and alcohol (ethanol) may have additive effects in lowering blood pressure. This combination is noted in official information as being associated with symptoms such as dizziness or lightheadedness, particularly when therapy is initiated.


Q: How long does the effect of one administration of Каптоприл typically last?

The maximum reduction in blood pressure generally occurs 60 to 90 minutes after administration. The total duration of the blood pressure-lowering effect is officially described as dose-related and persists longer than the time the active drug remains detectable in the bloodstream.


Q: Can Каптоприл be used for conditions other than high blood pressure?

Yes, regulatory agencies have approved Captopril for specific conditions beyond high blood pressure. These conditions include managing heart failure, treating left ventricular dysfunction after a heart attack, and managing diabetic nephropathy (a type of kidney disease).


Q: What should I look out for if I feel dizzy after taking Каптоприл?

Dizziness is a common reported side effect, which is often related to the possible low blood pressure (hypotension) associated with the medication. Official sources describe dizziness as being associated with symptoms such as faintness and lightheadedness, particularly when initiating therapy or changing body position.


Q: Is Каптоприл a medicine that needs to be taken indefinitely?

Captopril is described in regulatory documents as a prescription medicine intended for the long-term management of chronic conditions such as high blood pressure and heart failure.


Q: Are there different strengths of Каптоприл, and how do they differ?

Captopril tablets are available in multiple strengths, such as 12.5 mg, 25 mg, 50 mg, and 100 mg. These different strengths are used in professional practice to facilitate the gradual adjustment (titration) process, which often starts with a low initial dose.


Q: What is the purpose of Каптоприл in managing heart failure?

Captopril's role in heart failure is primarily to suppress the system that causes blood vessel tightening, which helps to reduce the heart's workload. Official documents report that evidence indicates this action may help to improve survival and reduce the incidence of certain complications in stable patients with left ventricular dysfunction.


Q: Can taking Каптоприл on an empty stomach make a difference?

Yes, official information states that the presence of food can reduce the amount of Captopril absorbed by the body by approximately 30 to 40 percent. This is the factual basis for the instructions that the medication should be administered on an empty stomach to ensure proper absorption.


Q: What is the difference between Каптоприл and another '-pril' medicine?

Captopril is officially described as being the first drug in its class (ACE inhibitors) developed for oral use. Its pharmacological action involves a sulfhydryl group, which is a key part of its chemical structure and distinguishes it from some other members of the ACE inhibitor class.


Q: How soon after starting Каптоприл should blood pressure be re-checked?

Official dosing protocols indicate that dose adjustments (titration) for blood pressure management are often made at intervals of one to two weeks following the start of therapy. This timeframe is consistent with the interval often used for dose evaluation.


Q: What are the main benefits of Каптоприл for people who have had a heart attack?

For clinically stable patients who have had a heart attack and have certain heart function issues, Captopril is approved to help improve long-term survival, and evidence indicates it may help to reduce the risk of developing congestive heart failure (CHF).


Q: How does the use of salt substitutes affect someone taking Каптоприл?

Regulatory safety information states that Captopril increases the risk of high serum potassium (hyperkalemia). Since most salt substitutes contain potassium chloride, official guidance notes that the use of these substitutes may increase this risk.


Q: Is Каптоприл affected by grapefruits or grapefruit juice?

Published research on Captopril and grapefruit juice has generally not shown evidence of an interaction. Unlike some other medications, Captopril is not typically affected by grapefruit or grapefruit juice.


Q: Can taking Каптоприл affect my ability to drive or operate machinery?

Because side effects like dizziness and a drop in blood pressure (hypotension) may occur, Captopril may be associated with side effects that can affect alertness, and caution is noted in regulatory documents regarding tasks such as driving or operating machinery.


Q: What is the connection between Каптоприл and fluid retention?

The primary mechanism of Captopril involves suppressing the system that regulates fluid. This action leads to a decrease in the reabsorption of sodium and water by the body, which can consequently help to reduce excess fluid.


Q: Are there specific times of day Каптоприл is better taken?

Regulatory instructions specify that Captopril is typically administered in divided doses, two or three times per day, and must be taken on an empty stomach (one hour before a meal) to ensure proper absorption. The optimal time of day for the divided doses is not specified in the official information.


Q: Do studies support the use of Каптоприл in younger people with high blood pressure?

For the pediatric population (children), official regulatory documents explicitly note that the safety and efficacy of Captopril have not been established. Use in young adults is covered under the general adult indication for hypertension.


Q: What if I take Каптоприл and my blood pressure still seems high?

Official dosing guidelines describe Captopril therapy as beginning at a low dose, followed by a process of titration (gradual dose increase) over several weeks. Regulatory information indicates that the full blood pressure effect of a given dose may take up to 6 to 8 weeks to become evident.


Q: Is there a generic version of Каптоприл available?

Yes, Captopril is the official non-proprietary name (INN) for the active ingredient. Official information confirms the medication is available from various manufacturers in generic forms (non-branded).


Q: Does the efficacy of Каптоприл depend on my body weight?

Official regulatory dosing protocols for adults are determined by a standard starting dose followed by a process of gradual adjustment (titration). Pediatric dosing is, however, typically calculated based on body weight.


Q: Is Каптоприл a controlled substance?

Captopril is classified as a prescription-only drug (Rx) intended for chronic conditions. Official documents and federal schedules indicate that it is not classified as a controlled substance.


Q: How is Каптоприл connected to managing kidney disease in patients with hypertension?

Captopril is approved for use in managing diabetic nephropathy (kidney disease in diabetic patients). Evidence indicates that through its action of controlling blood pressure, it may help to slow the rate of decline of kidney function in this specific patient group.


Q: Is there a risk of fainting associated with taking Каптоприл?

Regulatory safety documents indicate that a severe drop in blood pressure (hypotension) can occur, particularly when therapy is initiated. This drop is sometimes associated with symptoms such as dizziness, lightheadedness, or fainting.

How should Каптоприл be stored and disposed of?

Captopril tablets must be stored at Controlled Room Temperature, specifically between 20 C and 25 C (68 F and 77 F). The medication requires protection from both light and moisture, and the container must be kept tightly closed. It is explicitly stated in regulatory labeling that Captopril must not be frozen. For child safety, the product must be stored out of the reach of children.

Disposal Instructions

The disposal of Captopril must follow official guidelines. The product is not on the list of medicines authorized to be flushed down the toilet. Disposal should prioritize drug take-back programs. If a take-back option is unavailable, the recommended alternative is mixing the medicine with an unappealing substance, placing the mixture in a sealed container, and discarding it in the household trash. All personal information should be removed from the packaging before disposal.

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

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