Nitromak Retard

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Medically reviewed

Marina Burgos

Last updated on 10/01/2026

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 Nitromak Retard

Property Description
Active ingredient Nitroglycerin (Glyceryl trinitrate)
Form Extended-release oral tablet (Retard tablet)
Pharmacological class Organic nitrate, Vasodilator
General purpose Prophylactic management of oxygen deprivation in the heart
Origin Synthetic

What Type of Medicine is Nitromak Retard and Its Composition?

Nitromak Retard is a synthetic single-ingredient medicinal product used in the management of cardiovascular health, containing Nitroglycerin (Glyceryl trinitrate). This compound functions as an antianginal agent and a potent vasodilator. The medicine belongs to the pharmacological group of organic nitrates, a class utilized for their role in circulatory dynamics. The composition contains only Nitroglycerin as the active ingredient, making it a focused, single-ingredient preparation.

What Does the "Retard" Tablet Form Mean?

The distinguishing feature of this medicine is its formulation as an extended-release oral preparation, indicated by the term "Retard." This specific design ensures that the active substance is released slowly over an extended duration to maintain a continuous effect. Unlike immediate-release preparations, this Retard tablet is positioned for sustained action via the oral route of administration. This form is specifically chosen for prophylactic patient needs requiring a consistent, long-acting therapeutic profile.

What is the General Purpose of Nitromak Retard?

The general purpose of the medicine is to help prevent episodes of chest discomfort by reducing the workload on the heart muscle. The Nitroglycerin acts as an effective vasodilator, causing the widening of blood vessels, which decreases the volume of blood returning to the heart (preload). By achieving this, the drug effectively reduces the heart's demand for oxygen. This consistent decrease in cardiac workload is the primary mechanism providing the medicine's preventative benefit in long-term management scenarios.

Regulatory References

  1. NIH, Nitroglycerin Information

What side effects are possible with Nitromak Retard?

Possible side effects and safety information

The safety profile for Nitromak Retard, an extended-release formulation of Nitroglycerin (Glyceryl trinitrate), is defined by effects related to its potent vasodilatory action, as documented in regulatory sources such as the FDA and EMA.

Frequency-Classified Adverse Reactions

The adverse reactions are categorized based on their incidence, which primarily affects the vascular and nervous systems:

  • Very Common (More than 1 in 10 individuals): Headache. This effect is often most frequent at the beginning of treatment and typically lessens with continued use.
  • Common (Up to 1 in 10 individuals): Dizziness, Postural hypotension (low blood pressure upon standing), Tachycardia (increased heart rate), Flushing (reddening of the skin), and Nausea.
  • Uncommon to Rare: Less frequent reactions include vomiting and palpitations. Rare but serious reactions documented include profound severe hypotension (circulatory collapse) and paradoxical bradycardia (abnormally slow heart rate).

Serious Safety Considerations

The most serious safety concerns relate to the risk of life-threatening severe hypotension which can lead to shock. The label also notes the risk of Methemoglobinemia, a rare blood disorder that affects oxygen transport, which is generally of unknown frequency but officially recognized in the safety profile. The medicine is strictly contraindicated for use with certain other medications, specifically PDE-5 inhibitors (used for erectile dysfunction or pulmonary hypertension), due to the potential for fatal hypotension.

Population-Specific Notes

Safety information cautions that older adults may have heightened sensitivity to hypotensive effects, potentially increasing the risk of dizziness and falls. Safety considerations are also necessary for patients with severe hepatic or renal impairment due to potential changes in how the body processes the active substance.

Overdose and Emergency Response

Overdose and when to seek help

Overdose with extended-release nitroglycerin, such as Nitromak Retard, is primarily characterized by an excessive extension of its vasodilatory effects. Officially documented clinical manifestations of overdose include signs of severe hypotension, palpitation, and reflex tachycardia or bradycardia, which can progress to circulatory collapse. Central Nervous System effects officially listed in regulatory documents include a persistent throbbing headache, confusion, vertigo, convulsions, and the potential for coma. Less common but severe outcomes documented include methemoglobinemia and death due to circulatory failure.

When to Seek Immediate Medical Help

Regulatory authorities mandate that you seek immediate medical attention right away if an overdose is suspected. You must call 911 or local emergency services immediately if the exposed person collapses, experiences a seizure, or has trouble breathing, as defined in official instructions.

Official Management Statements

The official regulatory basis for management emphasizes that therapy should be symptomatic and supportive. Due to the absence of a specific antidote to counteract the primary effect, treatment is focused on measures like central volume expansion, including intravenous fluids, and elevation of the extremities. Close hemodynamic monitoring is required, and specialized monitoring may be necessary for patients with concurrent severe renal or heart failure, as specified in regulatory labeling.

Therapeutic Uses of Nitromak Retard

What Nitromak Retard treats: main uses and benefits

Nitromak Retard is a medication that is commonly used in situations involving certain distressing symptoms related to physical discomfort in the chest. Its primary application is in the context of conditions characterized by periods of heightened symptoms due to a heart condition, an issue known as angina pectoris.

The extended-release formulation is commonly used to help with symptoms associated with acute or episodic changes related to chronic stable angina. This medication assists with symptoms related to physical discomfort by easing the symptom clusters that may become intense or disruptive.

It is important to understand that as an extended-release medicine, Nitromak Retard is applied in clinical settings that involve acute or unstable symptom patterns. Its onset of action is not sufficiently rapid, and it is generally applied for chronic, sustained supportive symptom management. This supportive treatment contributes to easing the overall symptom load for patients. It supports patients during episodes of heightened discomfort.


Quick Fact: Relief for Symptoms related to physical discomfort


Regulatory References

  1. DailyMed FDA Prescribing Information

Eligibility and Restrictions for Use

Who Can and Cannot Use Nitromak Retard?

The population eligibility for using Nitromak Retard (Nitroglycerin Extended-Release) is strictly defined by regulatory documents, distinguishing between approved use in adults, absolute prohibitions, and conditional restrictions.

Absolute Contraindications (Must Not Use):

  • Patients with a known hypersensitivity to nitroglycerin or other organic nitrates.
  • Patients taking Phosphodiesterase-5 (PDE-5) inhibitors (e.g., sildenafil, tadalafil).
  • Patients taking the soluble guanylate cyclase (sGC) stimulator riociguat.
  • Individuals with severe anemia, increased intracranial pressure, or those in circulatory failure or shock.

Age and Conditional Restrictions:

  • Pediatric Patients: Safety and effectiveness have not been established in children.
  • Older Adults: Dose selection must be cautious, typically starting at the lowest regulatory range.
  • Pregnancy/Lactation: Use during pregnancy is conditional and advised only if clearly needed. Caution is required during lactation as excretion in human milk is unknown.

Conditional Restrictions: Use requires caution in patients who are hypotensive or have cardiac conditions like aortic stenosis.

What should I know about interactions with other medicines?

The official regulatory profile for Nitroglycerin (the active ingredient in Nitromak Retard) documents specific interaction patterns with other medicines and substances. These interactions are classified based on the resulting impact on blood pressure and changes in substance exposure.


Contraindicated Combinations

Co-administration of Nitromak Retard with certain other potent vasodilatory agents is formally prohibited. This absolute restriction applies to Phosphodiesterase Type 5 (PDE-5) Inhibitors (such as sildenafil, tadalafil, and vardenafil) and Soluble Guanylate Cyclase (sGC) Stimulators (such as riociguat). Combining these is an absolute contraindication, as it carries a high risk of severe hypotension and associated complications, as established in government regulatory documents.


Pharmacodynamic and Exposure Alterations

Other documented interactions relate to additive effects on blood pressure. Pharmacodynamic potentiation can occur with co-administration alongside antihypertensive drugs, beta-blockers, and calcium channel blockers, potentially leading to additive hypotensive effects. The official profile also notes exposure-altering interactions: Aspirin has been reported to decrease the clearance of nitroglycerin, resulting in increased systemic exposure. Conversely, oral nitroglycerin may increase the oral bioavailability of drugs such as dihydroergotamine. Additionally, the concurrent use of alcohol may cause hypotension due to documented additive vasodilating effects.

Mechanism of Action

How Nitromak Retard Works

The drug's mechanism centers on leveraging a natural signaling pathway to induce smooth muscle relaxation.


Bioactivation and Nitric Oxide Signaling

Nitromak Retard acts as a prodrug, undergoing enzymatic conversion primarily within the vascular smooth muscle cells to release the active messenger molecule, nitric oxide (NO). NO binds to and activates soluble guanylate cyclase (sGC), triggering the NO-cGMP pathway cascade that regulates muscle tone. This action constitutes the primary molecular step leading to the drug’s physiological effects.


Modulating Vascular Tone and Preload

The NO ightarrow cGMP signaling cascade causes widespread relaxation, or vasodilation, primarily in the veins (venodilation). This effect modulates the systemic vascular tone, causing blood to pool peripherally and decreasing the volume of blood returning to the heart. This action reduces cardiac preload, resulting in reduced cardiac workload.


Reducing Afterload and Cardiac Workload

Relaxation also occurs in the arteries, which decreases the overall resistance against which the heart must pump (known as afterload). The combined reduction of both preload and afterload reduces the mechanical stress and oxygen demand of the heart muscle. This change in hemodynamics reduces the heart's total energy expenditure and oxygen demand.

Dosage and Administration Information

How to Use Nitromak Retard: Administration Guidelines

Nitromak Retard is an extended-release medicine used for scheduled, sustained management, with established parameters for the proper use of this formulation.

Approved Route and Dosing

Administration Scope Requirement
Route of Administration The medicine is intended for Oral administration (by mouth) as an extended-release tablet or capsule.
Standard Dosing Therapy typically starts at a low dose (e.g., 2.5 mg or 6.5 mg), with maintenance doses ranging from 2.5 mg to 9 mg daily, depending on the specific regimen.

Administration Procedure and Schedule

  1. Swallowing Instructions: The extended-release tablet or capsule must be swallowed whole. The medicine must not be crushed, chewed, or divided.
  2. Frequency and Timing: The dosing schedule requires administration according to a strict daily regimen (often once daily or multiple times daily), not on an as-needed basis.
  3. Mandatory Drug-Free Period: The protocol for long-acting nitrates requires that the daily regimen incorporate a 10- to 12-hour drug-free interval every 24 hours. This is essential for maintaining efficacy.

Use in Specific Populations

  • Older Adults (Geriatric Use): Dose selection should be cautious, generally beginning at the low end of the dosing range.
  • Pediatric Patients: Safety and effectiveness in children have not been established.

Use Context Restriction

It is important to understand that due to its slow onset of action, Nitromak Retard is not sufficiently rapid for use in addressing an acute or sudden episode.

Recent Clinical Evidence

Research evidence / Overview of studies for Nitromak Retard


Evidence for Use in Prophylaxis of Chronic Stable Angina Pectoris

The research base for extended-release nitroglycerin, the active ingredient in Nitromak Retard, has explored its use for the long-term management of predictable chest discomfort. The research base consists primarily of data from short-term, controlled clinical trials. These studies, often called Randomized Controlled Trials (RCTs), were used in research exploring how symptoms change over time by comparing the medicine to a placebo in patients with stable angina pectoris. These trials were designed to observe responses over defined time intervals, typically lasting a few weeks.

The trials monitored outcomes related to physical discomfort and outcomes reflecting daily functioning or activity level. Data show patterns related to measurements of greater exercise tolerance when compared to measurements taken during the placebo period in the observed populations. Furthermore, studies describe patterns of lower measured frequency of anginal episodes in the observed populations. Findings also reported lower measured use of short-acting rescue medication during the study periods.

What Outcomes Were Examined in Trials?

Functional outcomes were monitored via exercise tolerance tests to evaluate outcomes related to daily functioning. This testing evaluated whether patients performed physical activity for a longer duration before symptoms associated with temporary physiological imbalance appeared. Researchers also monitored symptoms capturing phases of heightened symptom activity, such as tracking the frequency of anginal episodes.


Long-Term Studies and Follow-Up Data

Most foundational evidence comes from RCTs where follow-up durations were limited. Evidence contributes to the broader evidence landscape of symptom management, but there is limited information for long-term outcomes.

Research on the Development of Tolerance

Research describes that continuous use of organic nitrates may lead to tolerance, diminishing effectiveness over time. Studies explored the need for a daily nitrate-free interval to preserve the response pattern observed. Research is ongoing regarding the full implications of this required interval; however, some studies describe patterns where symptoms were more noticeable during this time.


Research Gaps and Areas of Uncertainty

Research is characterized by a focus on short-term changes. Long-term effects are not fully established, and it is not yet clear whether the medicine provides a sustained long-term effect on major cardiovascular events. The question of how to optimize the dosing pattern to address the phenomenon of tolerance is an area where research is ongoing. Additionally, data for specific subgroups, such as older adults, may be limited, meaning further studies exploring short-term symptom changes in these populations may be needed.

Key Studies & References

  1. Nitroglycerin Extended-release Capsules Prescribing Information (Reference for Efficacy, Outcomes, and Dosing Context)

Frequently Asked Questions (FAQ)

Common questions about Nitromak Retard (FAQ)

Q: How does Nitromak Retard differ from other short-acting nitrate medicines?

Nitromak Retard is an extended-release medication designed for the prevention of angina episodes, meaning it works over a sustained duration of several hours. This differs from short-acting nitrates, which are formulated to work very quickly for the immediate treatment of an acute (sudden) anginal attack. The prolonged action supports continuous management rather than emergency use.


Q: Is Nitromak Retard considered a blood pressure lowering medication?

The drug’s mechanism involves causing vasodilation (widening of blood vessels). This pharmacological action reduces systemic blood pressure and helps decrease the heart's workload. While the medication's primary indication is for angina management, this reduction in blood pressure is the key mechanism by which it achieves its effect.


Q: Does the medication need to be taken at the exact same time every day?

Official prescribing information requires the medicine to be taken on a specific and consistent daily schedule. This is necessary to ensure the required nitrate-free interval—a period of 10 to 12 hours without the drug in the body—is achieved every 24 hours. This consistent timing is considered essential for preserving the drug's long-term effectiveness.


Q: Are there any signs of a serious side effect that warrant immediate attention?

Regulatory documents list these signs as serious concerns that have been documented, such as symptoms of severe allergic reaction (e.g., trouble breathing or swelling of the face or throat). Additionally, signs of severe hypotension (very low blood pressure) like fainting or confusion are documented serious signs, as are symptoms of methemoglobinemia, such as a bluish color to the lips or palms.


Q: Is it safe to use Nitromak Retard with common over-the-counter pain relievers?

Official labeling documents that co-administration with Aspirin has been reported to potentially decrease the drug's clearance, which results in increased systemic exposure. For other common over-the-counter pain relievers, specific interactions may not be formally documented in the label. The official product information contains detailed warnings regarding concurrent use of over-the-counter medicines.


Q: Is it okay to drive or operate machinery while taking Nitromak Retard?

Regulatory warnings caution that this medication may cause dizziness, lightheadedness, or even fainting because of its effect on blood pressure. Regulatory warnings state that individuals should avoid driving or operating complex machinery until they understand how the drug may affect their coordination.


Q: Are there long-term safety concerns associated with using Nitromak Retard for many years?

Long-term use of organic nitrates carries the known safety risk of tolerance, which means the effectiveness of the drug may decrease over time without a daily break. Furthermore, official information notes that in industrial workers exposed to high levels of the active ingredient, sudden withdrawal led to symptoms suggesting a degree of physical dependence.


Q: What happens if a user misses a dose of Nitromak Retard?

The official procedure for a missed dose indicates that the medicine may be taken as soon as remembered. However, if it is almost time for the next scheduled dose, the procedure is to skip the missed dose entirely and continue with the regular schedule. Regulatory instructions strictly state that a double dose must not be taken to make up for the one that was missed.


Q: Are there any specific supplements or herbal products that interact with this drug?

Because this medication causes vasodilation, certain supplements and herbal products that have blood pressure-lowering properties may cause an additive hypotensive effect. Examples of products that may interact include Hawthorn and Coenzyme Q10 (CoQ10). Official information documents the need for review of all supplements and herbals with a healthcare provider prior to use due to potential interactions.


Q: Is there a generic version of the medicine available?

Yes, the active ingredient in Nitromak Retard, nitroglycerin extended-release, is available as generic products. Official listings from regulatory agencies generally indicate that generic formulations exist alongside brand-name preparations in various dosage strengths.


Q: What happens in the body when someone stops taking Nitromak Retard?

Abruptly stopping the medication may lead to withdrawal symptoms. Regulatory warnings mention that angina episodes may be more easily provoked and that patients may experience signs of hemodynamic rebound (a sharp increase in blood pressure or heart rate) during periods without the medicine.


Q: Can Nitromak Retard cause unusual changes in vision?

Official listings of adverse reactions note that blurred vision is a possible side effect, though it is not classified as common. This is often associated with the medication’s vasodilatory effects that lead to hypotension (low blood pressure), or it may occur in cases of overdose.


Q: Why is hydration sometimes mentioned when taking nitrate medicines?

Regulatory information cautions that the drug should be used with careful monitoring in patients who may be volume depleted (lacking proper hydration). These individuals are at a significantly higher risk for experiencing severe hypotension—a dangerously sharp drop in blood pressure—due to the drug's strong vasodilating effects.


Q: Where can I find the official regulatory information for Nitromak Retard?

Official labeling and prescribing information can be accessed on government drug databases. Key examples include the U.S. Food and Drug Administration's (FDA) DailyMed and the European Medicines Agency (EMA) product information websites, which host the validated regulatory documents.

How should Nitromak Retard be stored and disposed of?

Nitromak Retard, an extended-release nitrate tablet, must be stored in strict accordance with regulatory requirements to maintain its stability.

Storage Environment

Requirement Condition
Temperature Controlled Room Temperature (20°C to 25°C, or 68°F to 77°F).
Protection Protect from light and excessive moisture. Keep from freezing.
Container Must be kept in the tightly closed, light-resistant container in which it was dispensed.

Handling and Disposal

Storage must be out of the sight and reach of children. The medicine should be kept away from areas of high humidity or heat, such as the bathroom. Do not keep outdated medicine or medicine no longer needed. Unused or expired tablets must be disposed of according to local regulations for pharmaceutical waste, often through an official drug take-back program, and should not be flushed down the toilet.

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

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