Monobide

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Medically reviewed

Marina Burgos

Last updated on 22/12/2025

This page provides general, reference-level information compiled from official medical sources. It is not a substitute for professional medical advice, diagnosis, or treatment. For decisions about your health, please consult a qualified healthcare professional.

Overview of Monobide

Property Description
Active Ingredient Isosorbide Mononitrate (ISMN)
Form Oral Tablet (Conventional and Extended-Release)
Pharmacological Class Nitrate Vasodilator, Antianginal Agent
Common Use Prevention of Angina Pectoris (Chest Discomfort)
Origin Synthetic (Organic Nitrate)

What Type of Medicine Is Monobide?

Monobide is a prescription medication whose active ingredient is Isosorbide Mononitrate (ISMN), placing it in the pharmacological class of a Nitrate Vasodilator, or antianginal agent. This compound is chemically defined as an organic nitrate and represents a synthetic, single-ingredient product. Isosorbide Mononitrate is the major biologically active metabolite of the related drug isosorbide dinitrate, distinguishing itself by being effective without requiring extensive first-pass conversion by the liver. This unique metabolic profile is clinically recognized for providing a more predictable and reliable therapeutic action, which is essential for consistent, long-term therapeutic use in adult patients.

Monobide's Composition and Pharmaceutical Forms

The medication is typically supplied for oral administration in the form of a tablet, utilizing pharmaceutical excipients necessary for forming the solid dosage. The active substance, Isosorbide Mononitrate, is offered as both a conventional tablet and, more importantly, as an extended-release tablet (ER). The extended-release formulation is specifically designed to provide prolonged absorption, a key feature for ensuring continuous antianginal protection throughout the day.

General Purpose: How Monobide Supports Heart Health

The general purpose of Monobide is the prophylaxis of angina pectoris, meaning it is used to help prevent recurring chest discomfort in individuals with chronic stable angina. This benefit is achieved through the drug's core action as a vasodilator, which relaxes vascular smooth muscle and causes blood vessels to widen. Isosorbide Mononitrate serves to prevent angina through this effective vasodilation, which reduces the heart's workload and helps ensure a more stable and sufficient supply of oxygen-rich blood to the heart muscle, supporting cardiac function.

Regulatory References

  1. NIH DailyMed (https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=a00e0045-8f65-4f7f-af29-5775c9d690a9)
  2. confirmed by NIH (https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=a00e0045-8f65-4f7f-af29-5775c9d690a9)
  3. National Institutes of Health
  4. NIH StatPearls (https://www.ncbi.nlm.nih.gov/books/NBK553177/)

What side effects are possible with Monobide?

Possible Side Effects and Safety Information

The safety profile for Monobide (Isosorbide Mononitrate) is characterized by adverse reactions that are primarily linked to its vasodilatory action, as documented in official regulatory summaries.

Frequency and System-Organ Classification

The most frequently observed adverse reaction, officially classified as Very Common, is headache. This effect is noted in regulatory documents to be more frequent at the start of treatment and generally diminishes with continued therapy. Common reactions include dizziness, nausea, and vomiting.

Less frequently documented events fall into categories such as Vascular disorders, encompassing uncommon effects like hypotension (low blood pressure) and tachycardia (increased heart rate), along with syncope (fainting). Skin and subcutaneous tissue disorders (pruritus and rash) are classified as rare.

Critical Safety Constraints and Serious Reactions

The regulatory safety profile highlights potential serious reactions, including circulatory collapse (classified as very rare) and severe hypotension that may lead to syncope or, paradoxically, an exacerbation of angina. The medicine is also associated with hypersensitivity reactions (e.g., angioedema).

An absolute contraindication exists for patients concurrently using phosphodiesterase type 5 (PDE5) inhibitors due to the high risk of severe, life-threatening potentiation of the hypotensive effect. Use requires caution in specific populations, including older adults and individuals with documented renal or hepatic impairment.

Overdose and Emergency Response

Overdose and when to seek help

A Monobide overdose is primarily characterized by clinical manifestations resulting from profound vasodilation and subsequent hemodynamic instability. Documented presentations include severe hypotension, a persistent and throbbing headache, tachycardia, severe dizziness (vertigo), syncope, confusion, and, in severe cases, seizures or visual disturbances. The physiological systems affected include the cardiovascular, central nervous, and hematologic systems.


Severe Outcomes and Emergency Actions

Overdose may lead to severe systemic outcomes, most notably Methaemoglobinaemia, a condition documented to occur rarely, which can present with cyanosis and lead to circulatory failure. The official regulatory guidance mandates that individuals seek immediate medical attention and contact emergency services for any suspected overdose incident.


Supportive Management

In the event of an overdose, management is focused on supportive care to correct the resulting hypotension, often involving procedures to increase central fluid volume, such as intravenous infusion of normal saline. Patient monitoring should continue for a minimum of 12 hours. If Methaemoglobinaemia is confirmed, Methylene Blue is documented as the specific treatment. Caution is advised, as the fluid expansion procedure may be hazardous in patients with pre-existing renal failure or congestive heart failure.

Therapeutic Uses of Monobide

What Monobide Treats: Main Uses and Therapeutic Benefits

This medication is commonly used for the long-term, daily prevention of symptoms related to physical discomfort such as angina pectoris (chest discomfort). It is applied across domains where additional symptomatic support is needed to address conditions characterized by periods of heightened symptoms like Coronary Artery Disease (CAD). The primary therapeutic application is the prophylaxis of chronic stable angina, though it may also be used as an adjunctive treatment in the management of specific types of Heart Failure.

This regular application of Monobide assists with maintaining functional stability and plays a role in managing the frequency and potential severity of anginal attacks. It is relevant for easing exertional chest discomfort, which is pain triggered by physical activity. By managing the recurrence of these symptoms that interfere with daily functioning, the medication supports improved exercise tolerance and helps ease the overall symptom burden for the patient. As expressed in clinical contexts:

“Its application is within contexts involving supportive symptom management, rather than for the immediate cessation of acute episodes.”


Quick Fact: Relief for Recurring Chest Discomfort

Monobide supports patients by reducing the recurrence of exertional chest discomfort, which may assist with maintaining functional stability and allow for a more predictable experience in daily life.

Regulatory References

  1. Isosorbide: MedlinePlus Drug Information

Eligibility and Restrictions for Use

Official Population Eligibility for Monobide (Isosorbide Mononitrate)

Monobide's eligibility for use is strictly defined by regulatory authorities and centers on age, underlying medical conditions, and concurrent medications. The medicine is primarily established for use in adults (aged 18 and over) for the prophylaxis of angina pectoris. Use in the pediatric population (children and adolescents) is not established as safety and effectiveness data are insufficient.


Absolute Contraindications (Must Not Use)

Official labeling strictly prohibits Monobide use for individuals with a known hypersensitivity to nitrates. It is also contraindicated in patients who are simultaneously taking Phosphodiesterase Type-5 (PDE5) inhibitors (like sildenafil or tadalafil) or the soluble guanylate cyclase stimulator riociguat, due to the risk of severe, life-threatening hypotension.

Condition-Based Non-Eligibility

The medicine must not be used in the presence of severe hemodynamic instability, including marked hypotension (Systolic Blood Pressure le 90 mmHg), acute circulatory failure, or cardiogenic shock. Caution and close monitoring are required for patients with recent myocardial infarction, severe anaemia, hypertrophic obstructive cardiomyopathy (HOCM), or low cardiac filling pressures. For pregnancy and lactation, safety has not been established, and use is only permitted if the potential benefit is deemed to outweigh the possible hazard.

What should I know about interactions with other medicines?

Interactions with other medicines and products

The official regulatory profile for Monobide (Isosorbide Mononitrate) is primarily defined by critical restrictions on co-administration with other substances that affect blood pressure, as documented in government labeling.


Contraindicated Combinations

Co-administration with Phosphodiesterase-5 (PDE5) Inhibitors (e.g., Sildenafil, Tadalafil, Vardenafil) is absolutely contraindicated. This restriction is due to the potential for a severe, profound drop in blood pressure, syncope, or myocardial ischemia. The use of the Soluble Guanylate Cyclase (sGC) stimulator Riociguat is also formally prohibited, as this combination carries a similar risk of dangerous hypotension. A known hypersensitivity to Monobide or any other nitrate is a further contraindication.


Pharmacodynamic Interactions

Monobide's vasodilating effects may be additive with other hypotensive agents. Taking Monobide with Alcohol (Ethanol) is documented to potentiate the risk of symptomatic orthostatic hypotension, lightheadedness, and syncope. Similarly, concurrent use with Calcium Channel Blockers or other vasodilators can result in marked symptomatic hypotension. The combination with Dihydroergotamine may increase its plasma concentration, potentially enhancing its hypertensive effect.


Clearance and Procedural Notes

No specific CYP-mediated metabolic interactions are cited as the primary basis for restrictions. However, the medicine is officially documented to be significantly removed from the systemic circulation via hemodialysis, a procedural constraint relevant for patient management in that setting.

Mechanism of Action

️ Molecular Activation: The Nitric Oxide Pathway

Monobide's mechanism is initiated at the molecular level by serving as an organic nitrate donor, releasing the active gas molecule, Nitric Oxide ( NO), inside vascular smooth muscle cells. This NO binds to and activates the enzyme Soluble Guanylyl Cyclase (sGC), triggering a chemical cascade that elevates the second messenger cyclic Guanosine Monophosphate ( cGMP). The cGMP signaling pathway is the fundamental mechanism responsible for widespread vascular smooth muscle relaxation.


Systemic Effect: Lowering Cardiac Workload

The cGMP-driven relaxation preferentially affects the large veins (venodilation) over the arteries. This physiological change causes blood to pool in the peripheral circulation, reducing the volume of blood returning to the heart, a key hemodynamic event known as lowering the cardiac preload. By reducing this filling pressure and the associated wall tension, the mechanism directly lowers the Myocardial Oxygen Demand ( MVO2) of the heart muscle.


️ Mechanistic Limitation: Nitrate Tolerance

The NO mechanism is subject to the biological phenomenon of Nitrate Tolerance, which can develop with continuous high-level exposure. Tolerance involves the desensitization of sGC and/or the depletion of the cellular components required for the drug's bioactivation. This process leads to a change in the cellular response to NO signaling.

Dosage and Administration Information

How Monobide is Used: Official Administration Guidelines

Monobide (Isosorbide Mononitrate) is administered strictly via the oral route in either an Immediate-Release (IR) or Extended-Release (ER) tablet form. The usage protocol is designed for long-term, daily prophylaxis of chronic stable angina, not for intermittent use.


Official Dosing and Schedule

The fundamental principle of Monobide usage is the necessity for a daily nitrate-free interval to prevent the development of pharmacological tolerance. This principle dictates the specific administration schedules:

  • Extended-Release (ER) Tablets: Typically initiated at 30 mg or 60 mg and taken once daily in the morning upon rising. Doses may be increased to 120 mg once daily, but the tablet must be swallowed whole and cannot be chewed or crushed to maintain its controlled-release mechanism.
  • Immediate-Release (IR) Tablets: Often initiated at 20 mg and taken twice daily. To establish the required nitrate-free period (10-17 hours), the doses must be separated by a long interval, such as seven hours apart.

Contextual Use and Adjustments

Monobide can be taken with or without food. For proper administration, the tablet should be swallowed with a half-glass of fluid. For older adults, no routine dose adjustment is specified, though starting at the lower end of the dosing range is sometimes advised. Safety and efficacy in pediatric patients (under 18 years of age) have not been established.

Recent Clinical Evidence

Research Evidence / Overview of Studies for Monobide

Evidence for Use in Preventing Chronic Stable Angina

The primary body of research for Monobide (Isosorbide Mononitrate) was studied for its use in patients with chronic stable angina, a condition characterized by outcomes related to physical discomfort and episodic changes in symptoms. The evidence landscape includes Randomized Controlled Trials (RCTs). These short-term studies typically compared the medication against a placebo to observe outcomes reflecting daily functioning or activity level. Research populations consisted of adult patients with the condition, and some trials also studied older patients.

Research examined how symptoms evolved in the observed populations. Data show patterns related to symptom frequency, with studies reporting differences in the number of weekly angina attacks between the Monobide group and the placebo group during the observed time intervals. Findings describe patterns observed in the studies regarding anti-ischemic metrics, which were measured as outcomes related to physiological strain or stress during physical activity.

Studies Investigating Heart Failure and Functional Status

Monobide was also evaluated in research exploring its potential as a supportive treatment in specific types of Heart Failure. These studies often used crossover trial designs in specific patient subsets. The research examined outcomes related to systemic or functional imbalance and functional capacity measures. Findings showed variability when evaluating certain primary functional outcomes in these specific heart failure patient groups. The predominant research regarding long-term clinical outcomes is associated with combination therapy using a related dinitrate compound, not Monobide monotherapy.

Areas of Uncertainty and Research Gaps

A primary gap in the research is that there is limited information for long-term outcomes such as whether Monobide was associated with changes in the rate of heart attacks or long-term survival. Subgroup findings are uncertain in areas such as use in pediatric populations. Additionally, comparative evidence has limitations in some areas, meaning research has not fully determined the patterns of response of Monobide in comparison to other widely studied alternatives for angina symptoms.

Key Studies & References

  1. Isosorbide Mononitrate Extended-Release Tablet Label
  2. Isosorbide: MedlinePlus Drug Information

Frequently Asked Questions (FAQ)

Common questions about Monobide (FAQ)

Q: How long can a person safely take Monobide?

Official guidelines for Monobide (Isosorbide Mononitrate) prescribe its use for long-term, daily prophylaxis of chronic stable angina, and it is described as being appropriate for long-term therapeutic use. However, regulatory documentation has indicated that there is limited available information regarding its association with very long-term clinical outcomes, such as heart attack rates or overall survival.

Q: Is Monobide a type of pain reliever?

Monobide is an antianginal agent and nitrate vasodilator used to help prevent recurring chest discomfort, known as angina. Regulatory sources confirm that this medicine is for prevention, and it does not work fast enough to relieve the acute chest pain of an angina attack that has already started.

Q: How quickly does Monobide typically start working?

The time it takes for the medicine to act depends on the formulation. Official data on the immediate-release tablet shows it is quickly absorbed, reaching its highest levels in the blood about one hour after a dose. The extended-release form is specifically designed to be absorbed more slowly to provide continuous protection over the day.

Q: Does Monobide have a generic version available?

Yes, according to the U.S. FDA and other regulatory agencies, the active ingredient, Isosorbide Mononitrate, is available as a generic drug. Generic versions are reviewed to ensure they contain the same active ingredient and work in the same way as the brand-name product.

Q: Will taking Monobide make me feel sleepy?

Official adverse reaction reports indicate that common side effects include dizziness, headache, and feelings of tiredness or weakness. While sleepiness or unusual drowsiness are generally rare, the potential for central nervous system effects exists and may be noted in official drug documentation.

Q: Is it normal to have mild stomach upset when starting Monobide?

Yes, regulatory drug information classifies nausea and vomiting as common adverse reactions, particularly when beginning treatment. Less frequent gastrointestinal issues, such as heartburn, poor appetite, and diarrhea, have also been reported in clinical studies.

Q: Are there any common foods or drinks to avoid while using Monobide?

Official labeling states that the concurrent use of Alcohol (Ethanol) is associated with an increased risk of symptomatic orthostatic hypotension, which is a significant drop in blood pressure when standing, and lightheadedness. This combination is generally described in official documents as one to be avoided.

Q: Can Monobide cause issues with my liver?

Monobide is processed and eliminated from the body primarily by the liver. Official documents indicate that the use of Monobide in patients with severe hepatic impairment (liver disease) often requires close monitoring by a healthcare professional.

Q: What happens if I forget to take Monobide?

Regulatory guidance provided in patient information leaflets generally instructs users to skip the missed dose if they forget to take Monobide. Regulatory guidance advises against taking a double dose to make up for the missed one.

Q: Are there any recent studies about Monobide?

Yes, public records from governmental registries, such as ClinicalTrials.gov, indicate that the active ingredient (Isosorbide Mononitrate) continues to be investigated. Researchers are still evaluating its potential use in ongoing or recently completed studies for various heart and vascular-related applications.

Q: Is Monobide known to cause weight gain or loss?

Weight changes are generally not listed among the common or frequently reported side effects in the official safety summaries. However, some regulatory safety profiles do note that weight gain has been reported in the list of rare or less frequent adverse reactions.

Q: What if I start feeling better before I finish the course of Monobide?

Monobide is intended for long-term daily prevention. Official product information emphasizes that treatment should not be stopped abruptly, as this action may be associated with a return of chest pain or the potential for other serious cardiac events.

Q: Is Monobide considered habit-forming or addictive?

Isosorbide Mononitrate is not classified as a controlled substance by regulatory agencies such as the DEA. However, official documents have noted that physical dependence has been observed in industrial workers exposed to high levels of organic nitrates, though the importance of this finding to routine clinical use is unknown.

Q: Does the manufacturer of Monobide provide a patient-information leaflet?

Yes, all manufacturers of FDA-approved and similarly regulated medications are required to provide comprehensive patient safety and use information. Official regulatory websites provide access to the Patient Information Leaflet (PIL) or Patient Medication Information (PMI) for Monobide formulations.

Q: What is the difference between Monobide and other similar medications?

The active ingredient in Monobide (Isosorbide Mononitrate) is chemically notable because it is the major active form of a related drug, Isosorbide Dinitrate. This metabolic profile means Monobide bypasses significant processing by the liver, which is clinically recognized for providing a more reliable and predictable therapeutic action.

Q: Do people who take Monobide notice changes in their sleep?

Reports from clinical trials note that some individuals taking isosorbide mononitrate have experienced sleep disturbances or insomnia (trouble falling or staying asleep). These are noted in the full adverse event lists provided in official regulatory documents.

Q: Can I drive or operate machinery while taking Monobide?

Due to its primary action as a vasodilator, this medicine may cause side effects such as dizziness, headache, or blurred vision. Official information indicates that if you experience these symptoms, driving or operating complex machinery should be avoided.

Q: Do certain groups of people respond better to Monobide?

Regulatory summaries acknowledge that the current body of research includes limitations in comparative evidence. Official documents report that findings remain uncertain in some subgroups, meaning research has not yet fully determined if specific populations respond better compared to other available treatment alternatives.

Q: Does Monobide interfere with laboratory tests or blood work?

Yes, official labeling notes a specific interaction with laboratory tests. Nitrates and nitrites may interfere with the Zlatkis-Zak color reaction, a method used to determine serum cholesterol levels, which can lead to falsely low readings.

Q: What kind of monitoring is typically done when taking Monobide?

Close monitoring by a healthcare professional is generally required for patients with underlying conditions such as severe liver or kidney disease. Additionally, due to the risk of severe hypotension (low blood pressure), official warnings indicate that blood pressure monitoring is essential during treatment.

Q: Is Monobide a controlled substance?

No, Isosorbide Mononitrate is not scheduled by the U.S. Drug Enforcement Administration (DEA) or similar international bodies and is not considered a controlled substance.

How should Monobide be stored and disposed of?

How to Store and Dispose of Monobide

Monobide (Isosorbide Mononitrate) must be stored at controlled room temperature, generally defined as between 15 C and 30 C (59 F and 86 F). The medication must be protected from excessive moisture and excessive heat, and must not be frozen.

Storage Requirements

  • Keep the tablets in the original container, ensuring it is tightly closed to maintain product stability.
  • As with all medicines, Monobide must be stored out of the sight and reach of children.

Disposal

  • Dispose of any unused or expired Monobide tablets according to local regulations.
  • The medication is generally not recommended to be flushed down the toilet or poured down drains; drug take-back programs are often the preferred method for disposal.

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

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