Inocar

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Inocar

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 Inocar

What is Inocar?

Inocar is a medication containing the active substance amrinone (also known as inamrinone). It belongs to a class of drugs known as phosphodiesterase III (PDE3) inhibitors. This medication is primarily utilized in the management of specific heart conditions where the heart is unable to pump blood effectively to meet the body's needs.

Mechanism of Action

Inocar works through two primary mechanisms to support cardiovascular function:

  • Inotropic Effect: It increases the force of the heart muscle's contractions. By inhibiting the PDE3 enzyme, the medication leads to higher levels of cyclic adenosine monophosphate (cAMP) within the cardiac cells, which enhances the heart's ability to pump.
  • Vasodilation: It relaxes the smooth muscles in the walls of the blood vessels. This effect reduces the resistance against which the heart must pump (afterload) and decreases the pressure within the veins (preload), facilitating easier blood flow throughout the body.

Clinical Applications

Inocar is typically reserved for the short-term treatment of congestive heart failure. It is often used in clinical settings for patients who have not responded sufficiently to conventional treatments such as digitalis, diuretics, or other vasodilators. Due to its potent effects on heart rhythm and blood pressure, it is administered under close medical supervision in a hospital environment.

Regulatory References

  1. ACE inhibitors: MedlinePlus Medical Encyclopedia (NIH)

What side effects are possible with Inocar?

Possible Side Effects and Safety Information

The safety profile of Inocar (Cilazapril) is officially classified by regulatory authorities based on the frequency and system of the body affected. The most common adverse effects documented are generally associated with the drug's action as an Angiotensin-Converting Enzyme (ACE) inhibitor.


Frequency-Classified Adverse Reactions

Adverse reactions are formally grouped according to documented incidence rates in clinical use:

  • Common: Adverse effects reported to occur frequently include headache, dizziness, fatigue, and a dry, persistent cough. Gastrointestinal effects like nausea, vomiting, and diarrhea are also classified as common.
  • Uncommon: Reactions with a lower incidence include angioedema, chest pain, muscle cramps, and increased heart rate (tachycardia).
  • Rare/Very Rare: Infrequently documented effects include serious conditions like pancreatitis, severe liver function disorders (such as hepatic failure), and severe skin reactions.

Serious Safety Considerations and Regulatory Restrictions

Official labeling highlights specific serious adverse reactions and safety restrictions:

Safety Concern Description (Regulatory Basis)
Serious Adverse Reactions Potentially life-threatening reactions include Angioedema (swelling of the face, tongue, or throat), significant symptomatic hypotension, and acute renal failure

. | | Time-Related Pattern | Symptomatic hypotension is noted in regulatory documents as being most likely to occur following the first dose or with a dose increase. | Population Restrictions | Use is contraindicated in pregnancy due to the documented risk of fetal injury or death. Specific caution and monitoring are required for patients with pre-existing renal or hepatic impairment. | | Drug-Related Restrictions | The use of Cilazapril is strictly contraindicated in patients with a history of ACE inhibitor-related angioedema and concurrently with certain other medications, such as Neprilysin Inhibitors. |

The drug's safety framework mandates the routine monitoring of blood chemistry, including serum potassium and renal function (creatinine), to observe for potential adverse metabolic effects as documented in the prescribing information.

Overdose and Emergency Response

Overdose and When to Seek Help

The most serious outcome associated with overexposure to this class of medication is life-threatening respiratory depression and severe Central Nervous System (CNS) depression. Documented manifestations of overdose in humans include profoundly slowed, shallow, or difficult breathing; severe somnolence that may progress to stupor or coma; and the inability to awaken or respond to voice or touch. Overdose has also been associated with circulatory depression and pinpoint pupils.


Emergency Actions

The risk of serious harm, including fatal and non-fatal overdose, is increased with higher doses and remains present over the entire course of therapy. This severe risk necessitates that immediate medical help be sought for any signs of respiratory distress or unresponsiveness.

Classification Official Regulatory Note (General)
Severity Classification Overdose is classified as a risk of serious harm leading to fatal and non-fatal outcomes.
Emergency Response Seek emergency medical help or call 911 immediately if symptoms of respiratory problems are experienced, including slowed, shallow breathing, severe sleepiness, or not being able to respond.

Management of overdosage primarily involves maintaining a patent airway and providing ventilatory support. An opioid overdose reversal agent (e.g., naloxone or nalmefene) should be administered if available and when clinically appropriate to reverse the effects on the respiratory system.

Therapeutic Uses of Inocar

Inocar is commonly used to help manage certain chronic cardiovascular conditions. The medication is relevant in the treatment of both mild to moderate essential hypertension and as adjunctive therapy for congestive heart failure.

Therapeutic Focus

Inocar is applied in clinical settings marked by increased physiological stress, focusing on the sustained management of elevated arterial pressure and support for impaired heart function. The medication contributes to easing the overall symptom load related to reduced cardiac output, and generally assists with maintaining long-term stability of the cardiovascular system. This supportive relief is relevant for patients requiring assistance with chronic, fluctuating manifestations of these conditions.

Therapeutic Support Summary Inocar provides supportive symptomatic relief that helps stabilize chronic conditions, supporting the long-term management of symptoms related to heightened physiological activity and systemic imbalance.

Regulatory References

  1. Canadian Product Monograph for Cilazapril

Eligibility and Restrictions for Use

Eligibility Map: Who can and cannot use Inocar (Cilazapril) — Official Regulatory Information

Eligibility Scope

The use of Inocar is officially established for adult patients with essential hypertension or congestive heart failure. Use in children and adolescents (under 18 years) is not established and not recommended due to insufficient data.


Populations for whom use is contraindicated

The medicine is strictly contraindicated for several populations as stated in regulatory documents. These include patients with known hypersensitivity to Cilazapril or any ACE inhibitor, or a history of angioedema related to previous ACE inhibitor treatment. Inocar must not be used during the second and third trimesters of pregnancy, or in patients taking aliskiren (with specific kidney/diabetes conditions) or sacubitril. Absolute prohibitions also apply to patients with ascites (fluid build-up) or anuria (inability to pass urine).


Eligibility-Related Restrictions

Use is restricted based on organ function and physiological state. The medicine is not recommended for patients with severe renal impairment (Creatinine Clearance < 10 mL/min), and use in the first trimester of pregnancy and during breastfeeding is also not recommended. Patients with liver cirrhosis (without ascites) or conditions associated with a strongly activated RAAS (Renin-Angiotensin-Aldosterone System) require cautious initiation.

What should I know about interactions with other medicines?

Interactions with other medicines and products

Inocar (Cilazapril) is an ACE inhibitor and its official interaction profile is characterized by restrictions related to the Renin-Angiotensin System (RAS) modulation and potassium balance. All documented interactions reflect official statements from regulatory bodies.

Contraindicated Combinations and Timing Rules

Interaction Type Interacting Substance(s) Restriction and Outcome
Contraindicated Neprilysin Inhibitors (e.g., Sacubitril/Valsartan) Prohibited due to significantly increased risk of angioedema. A 36-hour washout period is mandatory when switching therapies.
Contraindicated Aliskiren Prohibited in patients with Diabetes Mellitus or specific levels of renal impairment (GFR < 60 mL/min/1.73m²).

Pharmacodynamic Interactions

Co-administration with Potassium-Sparing Diuretics (e.g., Spironolactone) or Potassium Supplements increases the risk of hyperkalemia (elevated serum potassium). Combining Inocar with Nonsteroidal Anti-Inflammatory Drugs (NSAIDs) may result in a loss of antihypertensive efficacy and an increased risk of acute renal function deterioration. Concomitant use with Lithium is officially associated with reduced Lithium clearance, increasing the risk of toxicity. The risk of angioedema is also heightened when Inocar is used with other substances such as mTOR inhibitors or Racecadotril.

Mechanism of Action

How Inocar Works

Inocar’s action is defined by its ability to precisely modify specific biological signaling pathways. It operates at the molecular level to alter the activity of specific biological processes, resulting in pathway-level modulation.

Primary Target: Selective Receptor Modulation

Inocar exerts its initial effect by selectively binding to a specific receptor type (Receptor X) within the target system. This interaction initiates a signal-modulating action—either blocking a signal (antagonism) or promoting a signal (agonism)—that is critical for altering the subsequent cellular response.

Pathway Adjustment and Cascade Interruption

This initial receptor engagement leads to the interruption or adjustment of a key intracellular signaling cascade (Pathway Y). By modifying these early molecular steps, Inocar decreases the magnitude of downstream signal transmission and alters the dynamics of the pathway within the cells.

Resulting Physiological Influence

The overall mechanistic effect contributes to influencing the activity threshold of the relevant physiological responses in the targeted regulatory system (System Z). By constraining the effect of mediator activity on downstream targets, Inocar influences the functional kinetics, which shapes the predictable alterations in systemic physiological dynamics.

Dosage and Administration Information

How Inocar (Cilazapril) is Used

Inocar is administered as a film-coated tablet designed for the oral route of administration. The usage is structured around a consistent once-daily schedule, aligning with the sustained pharmacological action of the drug. Adherence to official dosing and administration procedures is defined by specific guidelines for each approved condition.

Official Dosing Regimens

Indication Starting Dose (Once Daily) Maintenance Range (Max Daily)
Hypertension (Standard) 1 mg 2.5 mg to 5.0 mg (5.0 mg)
Chronic Heart Failure 0.5 mg 1.0 mg to 2.5 mg (5.0 mg)

The maximum recommended daily dose for both conditions is 5.0 mg. For the treatment of hypertension, the dose is typically assessed and adjusted over a period of two to four weeks. When used as adjunctive therapy for chronic heart failure, the initial dose must be administered under close medical supervision, with dose increases occurring cautiously in weekly intervals. The medication may be taken with or without food.

Usage in Specific Populations

Official prescribing information mandates lower starting doses for certain populations. For older adults (over 65) or patients with renal impairment, the starting dose for hypertension is often reduced to 0.5 mg or 1.0 mg once daily. Dosing for patients with renal impairment must be adjusted based on creatinine clearance; for example, the maximum daily dose is limited to 2.5 mg for those with moderate impairment. Safety and efficacy have not been established for use in children and adolescents under 18 years of age.

Recent Clinical Evidence

Research Evidence / Overview of Studies for Inocar (Cilazapril)


Research Evidence for Mild to Moderate Essential Hypertension

The evidence landscape for Inocar in managing high blood pressure primarily involves Randomized Controlled Trials (RCTs) and long-term observational analyses. These trials were often conducted comparing the agent against a placebo or other established high blood pressure medications. Research examined short-term changes relevant in trials assessing short-term or episodic symptom patterns. The main focus of research was studied for the change in systolic and diastolic blood pressure (BP), with measurements frequently taken 24 hours after dosing to assess whether the measured change was sustained over a full day.

Studies reported measurements of blood pressure values across the observed populations. Research describes changes measured during the study period for certain surrogate markers, such as those related to the structure of the left ventricle. A key limitation is the absence of dedicated, very large-scale, long-term RCTs for this specific agent that examine major cardiovascular events or mortality as a primary outcome. These critical outcomes are often understood by looking at the broader evidence for the entire class of Angiotensin-Converting Enzyme (ACE) inhibitors.


Research Evidence for Chronic Congestive Heart Failure (Adjunctive Use)

The evidence for Inocar was evaluated in the context of adjunctive treatment for chronic heart failure, a condition associated with functional limitations. This evidence is based on Randomized Controlled Trials and studies exploring patient-reported experiences. These trials were designed to examine outcomes reflecting daily functioning or activity level, such as the patient’s ability to exercise and changes in the New York Heart Association (NYHA) functional classification of their symptoms.

Studies explored how symptoms evolved in the observed populations, describing patterns in measured endpoints like exercise tolerance time. Research also examined temporary physiological imbalance, specifically reporting measured shifts in hemodynamic parameters, such as ejection fraction. As with hypertension, the main research limitation is the lack of dedicated, large-scale, long-term studies for this specific agent where outcomes like long-term survival are the main focus.


Research Gaps and Remaining Uncertainties

While Inocar has been studied extensively, the evidence highlights what is known and what is still uncertain. Comparative evidence is lacking for direct comparisons against some of the newest classes of medications used for hypertension or heart failure. Furthermore, the most significant long-term outcomes, such as mortality and major cardiovascular events, are not fully established by dedicated large-scale trials focused solely on this medication. The research provides context but not individual predictions, and study results reflect the specific conditions under which they were conducted.

Key Studies & References

  1. PRODUCT MONOGRAPH CILAZAPRIL (cilazapril monohydrate tablets) 1 mg, 2.5 mg and 5 mg Angiotensin Converting Enzyme Inhibitor (Health Canada)
  2. Inhibace - PRODUCT MONOGRAPH (Cilazapril) - Clinical Trials and Indications (Health Canada)

Frequently Asked Questions (FAQ)

Common questions about Inocar (FAQ)

Q: What is Inocar used for, in simple terms?

A: Inocar is an officially approved prescription medicine. Regulatory documents state that it is used to manage high blood pressure (hypertension) and is also used as an added treatment for long-term chronic heart failure.


Q: How quickly does Inocar typically start to show its effects?

A: Official drug labels indicate that significant effects, such as low blood pressure (hypotension), can occur shortly after the very first dose. However, the time required to reach the full stable therapeutic effect may take several weeks, as dose adjustments are typically required.


Q: If I miss a dose of Inocar, what is the official guidance?

A: Official guidance is typically to skip the missed dose entirely and simply resume your normal schedule the next day. Official documentation advises against taking two doses at once to compensate for a missed dose.


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

A: Yes, official product information indicates that Inocar may cause side effects such as dizziness, lightheadedness, or fatigue. These effects are most likely when treatment is started or when the dose is increased. If these effects occur, they may represent an impairment to the ability to drive or operate machinery, according to the label.


Q: Are there any common foods or drinks I should avoid while taking Inocar?

A: Inocar can be taken with or without food. However, official warnings state that the co-use of potassium supplements or salt substitutes that contain potassium may increase the risk of hyperkalemia (high potassium levels in the blood).


Q: Can Inocar cause long-term side effects that I should be aware of?

A: The most commonly reported and sometimes persistent adverse effect for this class of drug is a dry, non-productive cough. This symptom has been observed to last while treatment is ongoing. While official documents list serious effects, they are not all explicitly labeled as 'long-term'.


Q: Is Inocar safe to use if I have an existing kidney condition?

A: Regulatory information indicates that Inocar may be used in patients with kidney impairment, but often requires a lower starting dose and cautious adjustments. Because the drug is primarily cleared by the kidneys, regular monitoring of kidney function is a required component of therapy, as outlined in official documents.


Q: What happens if I accidentally take too much Inocar?

A: If too much Inocar is taken, the most likely effect is severe low blood pressure (hypotension), which can cause dizziness and fainting. Other potential risks include high potassium levels and acute kidney impairment. Official information indicates that medical attention should be sought immediately in the event of a suspected overdose.


Q: Does Inocar interact with common over-the-counter pain relievers like ibuprofen or acetaminophen?

A: Official documents warn that combining Inocar with Nonsteroidal Anti-Inflammatory Drugs (NSAIDs), which includes medicines like ibuprofen, may reduce the blood pressure-lowering effect. This combination can also increase the risk of acute kidney problems. Acetaminophen is not typically listed as an interaction concern.


Q: Can Inocar be stopped suddenly, or does the official labeling advise against it?

A: Official drug labels indicate that treatment with Inocar is not intended to be stopped without the consultation of a healthcare professional. Stopping the medication abruptly without supervision may lead to an unsafe rise in blood pressure or worsening of the underlying condition.


Q: What is the official information regarding Inocar use while breastfeeding?

A: Official labeling typically states that Inocar is not recommended while breastfeeding. Official documents note that this drug class may pass into breast milk in small amounts, and the official recommendation is against use during this period due to potential theoretical risks to the infant, such as low blood pressure.


Q: Does Inocar have a black box warning from the FDA, and if so, what is it for?

A: Yes, Inocar belongs to a class of medicines (ACE inhibitors) that often carry a Boxed Warning—the most serious warning required by the FDA. This warning concerns the risk of severe fetal toxicity (injury and death to the developing fetus) when the drug is taken during the last two trimesters of pregnancy.


Q: How long can a person typically expect to be on Inocar treatment?

A: Inocar is approved for treating chronic conditions like high blood pressure and heart failure. Therefore, the treatment is generally intended to be long-term or indefinite to manage the condition and maintain the desired physiological effects.


Q: Can Inocar interact with alcohol, and what does the official guidance say?

A: Yes, official guidance advises caution regarding alcohol. Alcohol can enhance the blood pressure-lowering effects of Inocar, significantly increasing the risk of side effects such as dizziness, lightheadedness, and fainting.


Q: Are there any known restrictions on who can take Inocar based on ethnicity or genetics?

A: Official documents note that Inocar and other ACE inhibitors may be less effective in lowering blood pressure in Black patients compared to non-Black patients. Furthermore, the serious risk of angioedema (face/throat swelling) may be higher in this population.


Q: Can Inocar affect hormone levels or fertility?

A: Non-clinical (animal) toxicology studies documented in regulatory sources did not show impairment of fertility at relevant doses. While the drug affects a key regulatory system, human data on specific hormone levels or fertility are generally not a primary focus of the official drug label.


Q: Where can I find the official prescribing information for Inocar online?

A: The official prescribing information can be found on government regulatory websites by searching for the active ingredient, Cilazapril. Reliable sources include the FDA's DailyMed portal and the websites for the European Medicines Agency (EMA) or the UK's regulatory agency (MHRA).


Q: What official information exists about Inocar and psychiatric side effects like depression or anxiety?

A: Common side effect lists for Inocar do not typically include depression or anxiety as frequent adverse reactions. However, patient leaflets may note less frequent central nervous system effects such as drowsiness, which are linked to the drug's physiological effects.


Q: How does Inocar exit the body (metabolism and excretion)?

A: Inocar is considered a 'prodrug,' which means it is quickly converted by the body into its active form, called cilazaprilat. Regulatory documents specify that this active metabolite is mainly eliminated by the kidneys through renal excretion.


Q: Are there any known visual or eye-related side effects with Inocar?

A: Official documents do not typically list visual changes or specific eye disorders as a common or frequent side effect of Inocar itself. If visual changes occur, they may relate to blood pressure fluctuations, and guidance from a healthcare professional should be sought.

How should Inocar be stored and disposed of?

Official Storage Conditions

Inocar (cilazapril) must be stored at controlled room temperature, typically between 15 C and 30 C (59 F and 86 F). The regulatory requirements mandate that the tablets be kept in a dry place, protected from moisture and direct light, and kept from freezing.

To maintain stability, the medication must remain in its original container with the lid tightly closed.

Child Safety and Disposal

Official labeling requires Inocar to be stored out of the sight and reach of children to prevent accidental ingestion.

Disposal must follow pharmaceutical waste guidelines: Do not flush unused or expired tablets down a toilet or throw them into household garbage. Patients must return the product through a drug take-back program or ask a pharmacist for safe disposal instructions.

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

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