Glopir

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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 Glopir

Property Description
Active Ingredient Nifedipine
Form Oral Tablets (Sustained/Extended-Release) and Capsules
Pharmacological Class Calcium Channel Blocker (CCB) / Dihydropyridine Derivative
Common Use Principle Regulating vascular tension via arterial relaxation
Origin Synthetic Compound

What Type of Medicine Is Glopir and How Is It Classified?

Glopir is a prescription-only cardiovascular agent containing the single active ingredient Nifedipine, which is classified as a Calcium Channel Blocker (CCB), specifically a Dihydropyridine derivative. This synthetic chemical compound is one of the therapeutic drugs utilized to regulate the function of the heart and blood vessels. Nifedipine's role is clinically recognized within pharmacological practice. This class of medicine is recognized for its role in modulating vascular tension. This classification immediately distinguishes the compound's effect on the arterial system, which is a key therapeutic focus, particularly in adult patients requiring long-term vascular management.


Composition and Physical Forms of Glopir

The essential composition of Glopir is the single-ingredient active compound, Nifedipine, synthesized and formulated with excipients necessary for its oral route of administration. Nifedipine is available in various dosage forms, including traditional capsules and different types of tablets. The tablets are commonly manufactured as sustained-release or extended-release preparations, which are often utilized due to their design to maintain a consistent, controlled release profile over many hours. This pharmaceutical architecture represents a differentiating factor, allowing for specialized delivery compared to immediate-release formulations.


What Is the Core Therapeutic Principle of Glopir?

The drug’s therapeutic principle involves the fundamental inhibition of calcium influx into the muscle cells of the arterial walls, a mechanism characteristic of the CCB class. By limiting the entry of calcium ions, Nifedipine directly promotes the relaxation of these smooth muscles, resulting in widespread vasodilation (arterial widening). This action leads to a reduction in peripheral vascular resistance, a fundamental benefit that eases the overall workload placed on the heart and is utilized in therapeutic strategies aimed at managing arterial constriction.

Regulatory References

  1. Nifedipine Extended Release Tablets - FDA Label

What side effects are possible with Glopir?

Possible Side Effects and Safety Information for Glopir

The safety profile of Glopir (Nifedipine) is officially classified by government health authorities, detailing the types and frequencies of adverse reactions observed in clinical use.

Adverse effects are often linked to the drug's primary action, which affects the vascular system. Reactions are categorized based on their frequency of occurrence as defined in regulatory documents:

  • Very Common (Affecting 10% or more): The most frequently reported adverse reactions include headache, flushing (redness and warmth), and peripheral edema (swelling, typically in the legs or feet).
  • Common (Affecting 1% to 10%): These reactions include dizziness, fatigue, palpitations, constipation, nausea, and gastrointestinal pain.

Regulatory Safety Notes

Glopir's safety documentation includes considerations for certain patient populations and time-related patterns:

  • Time-Related Patterns: Adverse effects such as flushing and headache are documented in official prescribing information as being more frequent at the start of treatment or during initial dose adjustment. Additionally, gingival hyperplasia (overgrowth of gum tissue) is associated with long-term exposure.
  • Serious Adverse Reactions: Rarely, significant adverse events are reported, including excessive hypotension and, very rarely, the worsening of chest pain or myocardial infarction. Severe hypersensitivity reactions, such as angioedema, are also listed.
  • Safety Restrictions: Regulatory documents state that Glopir is contraindicated in patients with known severe hepatic impairment and in those with cardiogenic shock or severe aortic stenosis. Use in older adults requires caution due to potential changes in drug clearance.

Overdose and Emergency Response

Overdose and when to seek help

Official regulatory information describes overdose of Glopir (Nifedipine) primarily through the exaggeration of its effects on the circulatory system, necessitating immediate medical intervention. Overdose manifestations documented in official labeling include profound hypotension (dangerously low blood pressure), severe disturbances in cardiac rhythm such as sinus bradycardia and various degrees of AV block, along with loss of consciousness or unconsciousness in severe cases. Peripheral signs may include flushing, dizziness, and generalized edema. Laboratory findings like elevated serum creatinine and hyperglycemia have also been noted.


Required Emergency Actions

Regulators mandate that individuals seek immediate medical attention for a suspected overdose. It is stated that emergency services must be called immediately if the affected person collapses, has a seizure, has trouble breathing, or cannot be awakened. Severe outcomes associated with overdose include cerebral ischemia and myocardial ischemia, which are secondary to the dramatic fall in blood pressure. There is no specific antidote known.


Management and Monitoring

Management focuses on active cardiovascular support, including the use of intravenous fluids, pressor agents, and calcium infusion. Procedures such as gastric lavage or activated charcoal may be considered within the first hour of a potentially life-threatening ingestion. Hospital monitoring is required, often extending to 12 hours for sustained-release preparations, even if the patient is initially asymptomatic. Clearance of the substance is expected to be prolonged in patients with impaired liver function.

Therapeutic Uses of Glopir

Glopir is commonly used to help manage symptoms related to Systemic Arterial Tension and Ischemic Discomfort.

Glopir is applied across therapeutic domains where supportive symptom management is needed, including chronic systemic hypertension, Angina Pectoris (both stable and vasospastic), and specific conditions involving peripheral vasospasm (such as Raynaud's phenomenon). It is relevant for conditions characterized by periods of episodic or fluctuating manifestations that create noticeable physiological strain. The goal of therapy in these conditions is to provide support that helps ease the overall symptom burden.

“Glopir may assist with maintaining functional stability by addressing symptoms that interfere with daily functioning and comfort.”


Supporting Long-Term Control of High Blood Pressure

Glopir is commonly used to manage chronic systemic hypertension, a condition presenting with systemic imbalance. It provides support that generally helps with the sustained control of arterial tension. This use generally assists with maintaining stability in conditions marked by increased physiological stress.


Easing the Burden of Anginal Chest Discomfort

The medication is relevant for conditions characterized by periods of episodic or fluctuating manifestations of Angina Pectoris. Glopir is commonly used to help with the symptomatic relief of chest discomfort, pressure, or tightness and may assist with maintaining functional stability.


Quick Fact: Relief for Vasospasm Symptoms

Glopir is applied in scenarios where additional management of discomfort is required to address severe coldness, numbness, and pallor in the extremities.

Eligibility and Restrictions for Use

Who Can and Cannot Use Glopir?

Glopir use is strictly limited to populations for whom safety and efficacy have been established by regulatory authorities. The official labeling identifies groups that are absolutely prohibited from use and groups that require specific monitoring.

Contraindicated Populations

Use is absolutely prohibited for patients with known hypersensitivity to Nifedipine or other dihydropyridines, those in cardiogenic shock, with unstable angina pectoris, or within one month of a myocardial infarction. Contraindications also extend to those with clinically significant aortic stenosis and concurrent use of potent enzyme inducers like Rifampicin.

Restricted and Conditional Use

The medication is approved for adults but is not recommended for children and adolescents (under 18) as its safety and efficacy are not established. Patients with hepatic impairment (liver problems) must be closely monitored, and a dose reduction may be required. Caution is required for older adult patients and those with severe hypotension or poor cardiac reserve.

Pregnancy and Lactation Eligibility

Glopir is contraindicated in pregnancy by some regulatory authorities. Generally, it is not recommended during pregnancy and breastfeeding unless the expected clinical benefit decisively justifies the potential risk.

What should I know about interactions with other medicines?

Interactions with other medicines and products

The interaction profile of Glopir (Nifedipine) is defined by officially documented patterns involving metabolism, transport, and combined physiological effects, as stated in government regulatory documents.

Formal Contraindicated Combinations

Co-administration is formally prohibited with substances documented to severely reduce Glopir exposure, including Rifampin and other strong CYP3A4 inducers (e.g., Phenytoin, Carbamazepine). The herbal product St. John's Wort is also a contraindicated combination due to its inducing effects on the CYP3A4 metabolic pathway.

Exposure-Altering Interactions

Strong and Moderate CYP3A4 Inhibitors (e.g., Itraconazole, Erythromycin, HIV Protease Inhibitors) may significantly increase Glopir systemic exposure. Conversely, Glopir may affect co-administered medicines, with reports showing elevated serum Digoxin concentrations in P-glycoprotein substrate interactions. The consumption of Grapefruit or Grapefruit Juice must be avoided as it is documented to increase Nifedipine plasma concentrations (AUC and Cmax).

Pharmacodynamic and Population Notes

Glopir's co-administration with Beta-adrenergic Blocking Agents and other antihypertensive medicines is documented to increase the risk of severe hypotension due to additive blood pressure lowering. A population-specific constraint exists for patients with Hepatic Impairment, who exhibit altered pharmacokinetics (longer half-life, higher bioavailability) that affects the drug’s systemic exposure.

Mechanism of Action

Targeting Vascular Calcium Channels (L-VGCCs)

Glopir (Nifedipine) exerts its action by specifically blocking the L-type Voltage-Gated Calcium Channels ( L-VGCCs) found predominantly on the smooth muscle cells that line the arteries. This interaction, known as slow-channel blockade, prevents the influx of Ca^2+ ions required to initiate the excitation-contraction coupling sequence, which is the biological pathway that normally leads to vascular smooth muscle contraction.


Reducing Peripheral Vascular Tone and Resistance

The resulting lack of calcium signaling causes the arterial smooth muscle to relax, resulting in widespread vasodilation (arterial widening). This physiological adjustment reduces the Total Peripheral Vascular Resistance (TPR), which represents the impedance to blood flow the heart must overcome. The mechanism influences the cardiac afterload, which is the pressure resistance the ventricle must overcome.


Mechanism Selectivity and Reflex Constraints

Nifedipine is primarily vasoselective, meaning its effect is concentrated on the vascular channels rather than those in the heart muscle or conduction system. The extended-release formulation minimizes the rapid plasma concentration increase, which reduces the likelihood of stimulating the baroreceptor reflex and the resulting compensatory increase in heart rate (reflex tachycardia).

Dosage and Administration Information

How to Use Glopir: Official Administration Guidelines

Glopir (Nifedipine Extended-Release) is administered according to a specific regimen defined in prescribing information. The medication is available as Extended-Release (ER) Tablets in strengths that commonly include 30 mg, 60 mg, and 90 mg.


Administration Scope

Administration Detail Official Guideline
Route of administration Oral (swallowing the tablet whole).
Dosing schedule (Adults) Initial doses typically range from 30 mg to 60 mg once daily. Maintenance dosing is usually 30 mg to 90 mg once daily, not exceeding a maximum of 120 mg daily as per authorized labels.
Frequency and Timing The extended-release design requires dosing once daily, and it should be taken at approximately the same time each day.
Intake Condition The tablet may be taken with or without food.

Procedural and Population Requirements

Glopir tablets must be swallowed whole and must not be crushed, chewed, or divided under any circumstances, as this compromises the controlled-release mechanism.

Dose Adjustment: Dosage changes should be implemented gradually, usually at 7- to 14-day intervals, allowing time to assess response. If a dose is missed, patients should not double the next dose but should continue the regular schedule.

Population Use: The dosage for older adults may require careful adjustment, potentially necessitating lower maintenance doses. Caution and close monitoring are advised for patients with hepatic impairment, as reduced clearance may occur, while pediatric use is not generally recommended.

Therapy is typically managed on a long-term basis. Discontinuation requires a gradual decrease in the dose rather than abrupt cessation.

Recent Clinical Evidence

Research evidence / Overview of Studies for Glopir (Extended-Release Nifedipine)


Evidence for Use in Chronic Systemic Hypertension

Clinical trials, including large-scale Randomized Controlled Trials (RCTs), have extensively examined Glopir's use in the context of long-term high blood pressure control. These studies primarily monitored changes in systolic and diastolic blood pressure measurements. Research reports data patterns related to changes in blood pressure readings when compared to baseline across various adult populations. Researchers also monitored the incidence of major adverse cardiovascular events (such as heart attack or stroke) over the study periods, often within a combination therapy regimen. Findings indicate patterns related to blood pressure measurements over 24-hour periods using the extended-release formulation.


Evidence for Use in Angina Pectoris

Glopir was evaluated in trials exploring the study of chest discomfort linked to stable and vasospastic angina. These studies focused on patient-reported outcomes describing discomfort, such as the frequency and intensity of pain episodes. Additionally, research examined temporary physiological imbalance by monitoring outcomes related to physical discomfort during standardized activity, such as on an exercise treadmill. Studies report how symptoms evolved in the observed populations. Research highlights changes observed in the reported frequency of episodes and in the duration of standardized exercise before symptoms were noted. Research explored the use of the extended-release formulation compared to immediate-release forms.


Research in Special Populations and Uncertainties

Studies have evaluated Glopir's use in several specific populations, including older adults (aged 65 and above) and adults with coexisting conditions, such as diabetes. However, research data exploring long-term outcomes focusing specifically on monotherapy (single-drug) use for cardiovascular event reduction is less available than data for its use in combination therapy. Subgroup findings are uncertain in some cases because sample sizes were modest for certain specific populations. The available research base for Glopir includes certain areas but contains acknowledged research gaps, such as limited data for specific hypertensive conditions in pregnant individuals. Overall, research provides context but not individual predictions, highlighting what is known—and what is still uncertain.

Key Studies & References Nifedipine: MedlinePlus Drug Information (General use, dosing, and safety context)

Frequently Asked Questions (FAQ)

Common questions about Glopir (FAQ)

Q: How is Glopir different from other similar treatments?

Official documents describe Glopir's key differentiating features as its classification as a Dihydropyridine Calcium Channel Blocker and its Extended-Release (ER) formulation. This formulation is specifically designed to provide a smooth, controlled level of the active ingredient in the body over an extended duration, typically once daily. The mechanism is described as primarily focusing on relaxing the vascular smooth muscle.

Q: Does Glopir need to be taken long-term?

Regulatory guidance indicates that therapy with Glopir is typically managed on a long-term basis. This is because the drug is used to help manage chronic (long-lasting) conditions like high blood pressure and angina that often require ongoing treatment.

Q: How quickly does Glopir typically start to work?

The extended-release design means the active ingredient is released slowly and consistently after ingestion. Regulatory information indicates that steady-state drug levels, which correspond to therapeutic effect, may be achieved after several days of repeated daily dosing.

Q: What are the eligibility restrictions for taking Glopir?

Official restrictions fall into two main areas. First, contraindications prohibit use in conditions like cardiogenic shock or with certain strong enzyme-inducing medicines such as Rifampicin. Second, specific drug and food interactions are noted, such as the requirement to avoid grapefruit or grapefruit juice, which can significantly affect how the drug works.

Q: Can Glopir interact with common over-the-counter pain relievers?

Regulatory documents detail interactions with specific enzyme inhibitors and cardiovascular agents. They do not typically list common OTC pain relievers (like acetaminophen or ibuprofen) as formal, contraindicated interactions. It is important that users check the official label for any potential interaction with non-prescription medications.

Q: Are there any specific vitamins or supplements that Glopir interacts with?

Official documents explicitly contraindicate the use of the herbal product St. John's Wort, as it significantly reduces Glopir's systemic exposure. No specific interactions are typically listed for common daily vitamins or minerals.

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

Official guidance describes the effects of an overdosage as potentially including very low blood pressure (hypotension), a slow heart rate (bradycardia), or collapse. Regulatory documents state that overdosage requires immediate medical attention.

Q: Are there food types that might interact with Glopir?

Yes. Official documents clearly state that the consumption of Grapefruit or Grapefruit Juice must be avoided while using Glopir. This is because grapefruit can significantly increase the concentration of the active ingredient in the bloodstream.

Q: Can Glopir be crushed or split?

No. The extended-release tablets must be swallowed whole and must not be crushed, chewed, or divided under any circumstances. This is because compromising the tablet structure destroys the special coating, which is necessary for the controlled, 24-hour release mechanism.

Q: Does Glopir cause weight changes?

Official regulatory documents list changes to body weight, either an increase or a decrease, as reported adverse reactions. These reactions are typically categorized as uncommon, meaning they affect less than 1% of patients in clinical trials.

Q: Is it common to feel tired when starting Glopir?

Official prescribing information lists fatigue as a Common adverse reaction, reported in 1% to 10% of patients. Official prescribing information also notes that other common effects like headache and flushing are documented as being more frequent at the start of treatment or during initial dose adjustment.

Q: Does Glopir affect the ability to drive or operate machinery?

Official documents state that side effects associated with the drug, such as dizziness or fatigue, may affect a patient’s reaction capability. Caution is advised regarding the ability to drive or operate heavy machinery due to the potential for these side effects.

Q: Is Glopir excreted in breast milk?

Official documentation indicates that the active ingredient, Nifedipine, is excreted in small amounts in human breast milk. For this reason, the medication is generally described as not recommended for use while breastfeeding.

Q: How does Glopir affect blood test results?

Official documents list potential changes to blood test results as reported adverse reactions. These can include temporary changes to specific markers, such as liver enzymes (transaminases), but are generally categorized as uncommon or rare events.

Q: Why do some people stop taking Glopir?

Clinical study reports indicate that patients typically discontinue use due to the occurrence of adverse effects (such as common side effects like flushing or dizziness) or because the drug did not provide the desired therapeutic effect. Serious adverse events are rare but can also necessitate discontinuation.

Q: What is the average duration of action for Glopir?

The extended-release formulation is specifically designed for once-daily dosing. The therapeutic effect is, therefore, intended to be maintained for approximately 24 hours, which is supported by pharmacokinetic studies showing sustained drug concentrations in the body over this period.

Q: Are there specific times of day that Glopir is commonly taken?

Official guidelines state that the medication must be taken once daily and at approximately the same time each day. No specific time, such as morning or evening, is typically mandated, allowing flexibility in choosing a consistent schedule.

Q: Can Glopir cause dizziness or lightheadedness?

Yes. Dizziness is listed as a Common adverse reaction (reported in 1% to 10% of patients) in official documentation. Lightheadedness is often used by patients to describe symptoms related to orthostatic hypotension, which is a known physiological effect of this class of medicine.

Q: How long does Glopir stay in the system?

Regulatory documents report the half-life (the time it takes for half the drug to be eliminated) of the active ingredient for the extended-release formulation is approximately 7 to 12 hours. The substance is generally considered almost completely eliminated from the body after a duration equivalent to about five half-lives.

Q: Is Glopir known to cause allergic reactions?

Yes. Official regulatory documents list hypersensitivity to the active ingredient as a formal contraindication for use. Additionally, severe hypersensitivity reactions, such as angioedema (swelling beneath the skin), are listed as rare, serious adverse events.

Q: Do men and women experience different side effects from Glopir?

Official clinical trial reports generally provide adverse reaction data for the overall study population. Regulatory summaries do not typically highlight clinically significant differences in the overall profile of adverse reactions between adult men and women.

Q: What are the official clinical trial results related to Glopir?

Clinical trial results, as summarized in official sources, indicate the drug's intended action is to reduce systolic and diastolic blood pressure in patients with hypertension. Studies also show results related to the reduction in the frequency of angina episodes in patients with stable angina.

Q: Is it normal to have certain specific mild side effects when starting Glopir?

Yes. Official prescribing information notes that adverse effects such as headache and flushing (redness and warmth) are documented as being more frequent at the start of treatment or during initial dose adjustment.

Q: What are the physical characteristics of Glopir tablets/capsules?

Official product monographs describe the physical characteristics, including the available strengths (e.g., 30mg, 60mg, 90mg) and their typical appearance. The tablets are generally described as round or oblong, film-coated extended-release forms.

Q: Where can I find the official patient information leaflet for Glopir?

Official patient information is typically made publicly available through government health resources. You can usually find the Patient Information Leaflet (PIL) directly within the records of the National Institutes of Health (NIH) MedlinePlus, or via the information sections of the European Medicines Agency (EMA) website and other regulatory bodies.

How should Glopir be stored and disposed of?

How to Store and Dispose of Glopir?

Glopir (Nifedipine) must be stored strictly according to regulatory labeling to maintain its stability and effectiveness.

Storage Requirements

The medication must be kept at Controlled Room Temperature, typically 20 C to 25 C, and must be protected from light and moisture. Regulatory documents strictly mandate that the product be kept from freezing. Glopir must remain in its original container, tightly closed, to preserve its integrity and must be stored out of the sight and reach of children.

Disposal

Disposal of unused or expired Glopir must follow official guidelines. The preferred method is using a drug take-back program. Do not flush the medication down the toilet or pour it into a drain, as Nifedipine is not on the list of flushable medicines. If no take-back program is available, mix the product with an unappealing substance and place it in a sealed bag before discarding it in the household trash.

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

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