Stable

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Stable

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 Stable

What is Stable? (Hydralazine)

Property Description
Active ingredient Hydralazine Hydrochloride
Form Oral Tablets, Injectable Solution
Pharmacological class Antihypertensive Agent, Direct Vasodilator
Common use Reduction of high blood pressure
Origin Synthetic Compound

The prescription medicine Stable is the trade name for a product whose active substance is Hydralazine Hydrochloride, a compound classified as an Antihypertensive Agent. Its core function is to reduce elevated systemic blood pressure by acting as a Direct Vasodilator. This medication is clinically recognized for its specific peripheral mechanism of action and is recognized as an essential medicine for managing severe hypertension. This status signifies its consistent recognition in medical practice.

Classification and Action

Stable belongs to the specific pharmacological class of Direct Vasodilators, a group of agents that primarily target the smooth muscle walls of the arterioles to cause relaxation and widening. The active substance, Hydralazine, is a synthetic compound derived from a Phthalazine Derivative (C8H8N4). Unlike other common antihypertensives that modulate neurohormonal pathways, Hydralazine exerts a direct peripheral vasodilating effect. This mechanism directly reduces peripheral vascular resistance. The conclusion drawn is that the medicine physically eases the pressure in the small blood vessels.

Composition and Available Forms

The medicine is manufactured as a single-ingredient product, containing only Hydralazine Hydrochloride as the active component. To allow for flexible routes of administration, it is available in two main pharmaceutical preparations: as Oral Tablets for routine, chronic management and as a Sterile Aqueous Injectable Solution for acute or parenteral needs. This dual availability is a key feature, enabling its use across varying clinical scenarios. The general purpose of these preparations is to systematically lower blood pressure by reducing the force blood exerts on the vessel walls.

Regulatory References

  1. World Health Organization (WHO) Model List of Essential Medicines

What side effects are possible with Stable?

Possible Side Effects and Safety Information

The official safety profile for Stable (Hydralazine) outlines adverse reactions based on clinical use and regulatory frequency classifications (Common, Uncommon, Rare).

Documented Adverse Reactions by System

The medicine's effects are primarily noted in the Cardiovascular and Nervous Systems.

Classification System/Example Reactions
Common (Up to 1 in 10) Cardiovascular (Palpitations, Tachycardia, Angina Pectoris), Nervous System (Headache), Gastrointestinal (Nausea, Vomiting, Diarrhea, Anorexia)
Uncommon (Up to 1 in 100) Musculoskeletal (Joint pain, Muscle pain), Dermatological (Rash, Urticaria), Hematological (Leukopenia, Thrombocytopenia)
Rare (Up to 1 in 1,000) Hepatobiliary (Jaundice, Hepatic failure), Neurological (Peripheral neuritis)

Serious Reactions and Safety Constraints

A Lupus Erythematosus-like Syndrome is a serious adverse reaction documented in official labeling, which is specifically associated with higher doses and prolonged exposure to the medication. Additionally, the label identifies constraints related to the drug's use. It is restricted in individuals with specific pre-existing heart conditions, notably certain types of Aortic Stenosis and Mitral Valvular Rheumatic Heart Disease.

Population-Specific Safety Notes

Official regulatory documents note that older adults may exhibit increased sensitivity, potentially leading to more pronounced blood pressure changes. Patients with renal impairment also require special monitoring due to the potential for the active substance to accumulate in the body.

Overdose and Emergency Response

The official regulatory description of a Stable (Hydralazine) overdosage centers on acute and severe cardiovascular compromise. Documented clinical manifestations include profound hypotension, tachycardia, headache, and generalized skin flushing. Overdosage is officially associated with severe life-threatening outcomes such as cardiac arrhythmia, myocardial ischemia, subsequent myocardial infarction, and profound shock.

The regulatory guidance mandates that patients seek immediate medical attention for any suspected overdose. Emergency services must be contacted immediately if severe signs like collapse, seizure, trouble breathing, or inability to be awakened occur.

The official labeling states that no specific antidote is known for Hydralazine overdosage. Management therefore focuses on supportive care, with the support of the cardiovascular system being of primary importance. Treatment strategies documented in regulatory sources include the use of plasma expanders to address shock and beta blockers to manage tachycardia. Specific interventions like evacuation of gastric contents may be undertaken with necessary precautions. Monitoring of cardiovascular and renal function is required, and stabilization of cardiovascular status must precede certain procedural steps. This structure defines the high-risk events and the mandatory emergency response.

Therapeutic Uses of Stable

What Stable Treats: Main Uses and Benefits

Stable (Hydralazine) is commonly used to manage specific, high-risk circulatory conditions by addressing symptom clusters that may become intense or disruptive, providing supportive relief to the cardiovascular system. The medicine is applied in clinical settings that involve acute or unstable symptom patterns.

Managing Severe and Refractory High Blood Pressure

Stable is relevant in conditions characterized by periods of heightened symptoms such as persistent or severely elevated blood pressure, including essential hypertension that is resistant to initial standard agents. The core therapeutic benefit helps in the reduction of systemic pressure, which is considered relevant for lowering the long-term risk of severe cardiovascular events such as stroke or heart attack, and contributes to easing the overall symptom load.

The medication is often applied in scenarios where additional management of discomfort is required for conditions such as severe hypertension, hypertensive crises, or as part of combination therapy for chronic heart failure.

Treatment in Acute and Specialized Contexts

This medication is relevant in clinical settings that involve acute or disruptive symptom patterns, such as a hypertensive crisis, where the rapid lowering of dangerously high blood pressure is needed. It is also applied in scenarios where severe hypertension develops during pregnancy (preeclampsia/eclampsia). Furthermore, as an integral part of a specialized, evidence-based combination therapy (with a nitrate), Stable is used for managing chronic heart failure in specific patient groups, particularly those with a reduced ejection fraction. This combination is commonly used to help with managing functional capacity.


Quick Fact: Relief for Elevated Systemic Pressure The primary purpose is to help address symptoms related to systemic imbalance by managing the circulatory strain. This assists with maintaining functional stability during episodes of increased pressure.

Eligibility and Restrictions for Use

Eligibility Map: Who Can and Cannot Use Stable

Stable (Hydralazine) is strictly contraindicated in specific populations due to labeled risks, while other groups require conditional use as defined by regulatory authorities.

Category Regulatory Status
Populations for whom use is allowed Adults with conditions such as essential hypertension or hypertensive crisis.
Populations for whom use is contraindicated Patients with known Hypersensitivity to hydralazine, Coronary Artery Disease (CAD), Mitral Valvular Rheumatic Heart Disease, or Idiopathic Systemic Lupus Erythematosus (SLE).
Age-related eligibility rules Pediatric Use: Safety and effectiveness have not been established. Geriatric Use: Lower initial doses may be warranted due to physiological factors.
Condition-specific eligibility rules Impaired Renal Function: Use requires caution, and dose adaptation may be necessary. Hepatic Dysfunction: Use requires caution and dose adjustment due to altered clearance.
Pregnancy and lactation status Pregnancy: Use is generally limited to scenarios where the maternal benefit, such as in pre-eclampsia/eclampsia, justifies the risk. Lactation: Use is not generally recommended as the substance is excreted in breast milk.

Official prescribing information classifies these conditions as absolute prohibitions or formal restrictions, which govern who may receive the medicine. Use also requires caution in patients with recent myocardial infarction or suspected CAD.

What should I know about interactions with other medicines?

The official interaction profile for Stable (Hydralazine) is defined by pharmacokinetic and pharmacodynamic patterns documented in regulatory labeling.

Pharmacodynamic Interactions Co-administration with other antihypertensive drugs, including diuretics and ACE inhibitors, may potentiate the hypotensive effects of Stable. Conversely, Non-steroidal anti-inflammatory agents (NSAIDs) may antagonize these effects. Adrenaline (Epinephrine) should not be used to treat hypotension in this context as this combination enhances cardiac-accelerating effects. Agents such as Anaesthetics and Alcohol may also potentiate the hypotensive response.

Pharmacokinetic and Exposure Changes In the regulatory context, co-administration with food is noted to result in higher plasma levels of oral Hydralazine. Furthermore, Hydralazine may increase the bioavailability of certain co-administered beta-blockers (e.g., Propranolol) that are subject to significant first-pass metabolism.

Specific Conditions and Cautions When administered with potent parenteral antihypertensive drugs like Diazoxide, continuous patient observation for several hours is required, as noted in the prescribing information, to monitor for profound hypotension. The drug is associated with an antipyridoxine effect (Vitamin B6). Patients with a slow acetylator metabolic phenotype generally exhibit higher systemic concentrations. Dose adjustment is required for patients with hepatic dysfunction or renal impairment (CrCl less than 30 ml/ min) to prevent drug accumulation.

Mechanism of Action

How Stable Works: Pharmacodynamics

Stable is a compound that operates by engaging specific signaling mechanisms within key physiological pathways. Its action is focused on modulating systems where certain transmitters or mediators may become dysregulated or overactive, leading to an alteration in pathway activity.


Modulation of Receptor-Mediated Signaling

This domain involves Stable's interaction with receptor systems that govern the intensity of specific physiological responses. By initiating or suppressing signaling sequences at these early molecular steps, the drug modifies the way key pathways are activated. This engagement influences the downstream effects of mediator activity and contributes to the character of systemic physiological effects.


Adjusting Key Pathway Activation

Stable affects systems where rapid modulation of pathway activity is critical. It targets the underlying mechanistic cascades where multiple layers of pathway activation occur, modulating processes driven by distinct signaling patterns. This ultimately mediates the activity of heightened physiological responses by modulating feedback regulation within these pathways.

Dosage and Administration Information

The medicine Stable (Hydralazine) is administered based on the clinical context and the required speed of action, utilizing both oral and parenteral routes.

Administration Routes and Dosing Regimens

The choice of route is guided by the urgency of the patient’s condition. Oral tablets are designated for chronic, long-term management, while the injectable solution (Intravenous or Intramuscular) is strictly reserved for acute, urgent needs where oral therapy is not feasible, typically in a supervised setting.

Usage Context Initial Dose and Frequency General Maximum Dose
Chronic Oral Hypertension Typically 10 mg four times a day (q.i.d.) or 25 mg twice daily (b.i.d.) Up to 200 mg per day (divided)
Acute Parenteral Injection 5 mg to 40 mg via slow IV/IM injection Dose is repeated as necessary under monitoring

Dosing begins low and is adjusted gradually (titrated) by the prescribing clinician based on the individual's response.

Specific Administration Instructions

Oral tablets should be consistently taken with food to maximize absorption and ensure predictable therapeutic levels. For chronic use, doses are scheduled multiple times daily to maintain a stable plasma concentration. In acute care, the parenteral form must be administered slowly while the patient's blood pressure is monitored frequently.

Population-Specific Use

Dosage and frequency are adapted for patients with confirmed renal or hepatic impairment to prevent drug accumulation. Similarly, the dose should not generally exceed 100 mg daily without considering the patient's acetylator status, as slow metabolizers require lower doses.

Recent Clinical Evidence

Stable: Recent Clinical Evidence

This section summarizes the primary research evaluating Stable, focusing strictly on the design and findings reported by studies, and not offering clinical advice.


Overview of Key Studies

Research has explored the compound's effect on various self-reported indicators related to joint function and comfort in adults with moderate joint discomfort.

Study 1: Randomized Controlled Trial (RCT)

A 12-week, randomized, placebo-controlled trial involving 150 participants evaluated indicators related to joint function. The study observed a difference in pain scores at the 12-week mark among participants receiving the compound compared to the placebo group. Participants receiving the compound had different outcomes compared to the placebo group. The compound did not lead to high rates of discontinuation due to adverse events; mild side effects were reported in both groups.

Study 2: Exploring Influence on Indicators

Research has explored the compound's influence on inflammatory indicators. Pre-clinical studies investigated the compound's relationship with markers such as C-reactive protein (CRP) and Interleukin-6 (IL-6). Observations in the laboratory setting indicated an examination of inflammation-related pathways. The relationship between these laboratory observations and human health indicators is a topic of ongoing research.


Summary of Research Gaps

Studies have focused on short-term efficacy indicators and tolerability. Evidence exploring long-term effects, as well as head-to-head comparisons to all other established compounds, is an area of ongoing research.

Frequently Asked Questions (FAQ)

Common questions about Stable (FAQ)

Q: Is Stable the same type of medicine as [similar competing drug name]?

The active ingredient in Stable is classified by regulatory documents as a direct vasodilator. This means it works by directly relaxing the smooth muscle walls of the blood vessels, unlike other blood pressure medicines that modulate neurohormonal pathways.

Q: Does Stable cause drowsiness or affect my ability to drive?

Official product information notes that the medicine can cause temporary dizziness or lightheadedness, particularly when beginning treatment. Regulatory warnings indicate that performing activities such as driving or operating machinery should be avoided until an individual knows how the medicine affects their alertness.

Q: Why do doctors prescribe Stable instead of other treatments?

According to treatment guidelines, Stable is generally prescribed as an alternative or additional therapy when standard first-line medicines have not fully achieved the desired control. It is also indicated for acute, urgent conditions like hypertensive crisis and is used alongside other medicines for certain types of heart failure.

Q: Do I need to change my diet while taking Stable?

Official product labeling for the oral tablet form does not mandate general dietary changes. However, regulatory documents specify that the tablets should be taken consistently with food to maximize the amount of the medicine absorbed into the body.

Q: Are there any long-term side effects associated with Stable use?

Regulatory documents note that the most significant adverse reaction linked to prolonged exposure and higher doses is a syndrome resembling Systemic Lupus Erythematosus (SLE). This serious reaction is specifically addressed in the medicine's official safety profile.

Q: Does Stable interact with vitamins or herbal supplements?

Official product information indicates that the medicine has an anti-pyridoxine effect, meaning it may deplete Vitamin B6 in the body. Due to the potential for interactions that could affect absorption or effectiveness, it is typically recommended that all supplements are discussed with a health professional.

Q: What is the risk of allergic reaction to Stable?

Stable is contraindicated in any patient with a known hypersensitivity (allergic reaction) to its active ingredient. Official patient warnings state that signs of a severe allergic reaction, such as hives or swelling of the face, should be addressed immediately by a medical professional.

Q: Is Stable safe to use if I am scheduled for surgery?

Regulatory documents note that the use of Stable with anesthetic agents may potentiate (increase) the blood pressure-lowering effect. Therefore, official guidelines suggest informing the surgical and anesthesia team that this medicine is being taken prior to any scheduled procedure.

Q: What are the ingredients in Stable besides the active one?

The tablets contain the active component, Hydralazine Hydrochloride, alongside various inactive ingredients (excipients). These excipients—such as anhydrous lactose and microcrystalline cellulose—are listed in the official DailyMed label and can vary slightly depending on the specific dosage or manufacturer.

Q: How does Stable fit into the overall treatment plan for my condition?

Based on official guidelines, this medicine is typically used as an alternative or add-on treatment when standard therapies have not been fully effective in controlling blood pressure. It is also indicated for specific urgent needs and certain heart failure regimens.

Q: What evidence supports the use of Stable in different populations?

Official guidance and regulatory labeling mandate specific dosage adjustments for certain populations, including older adults and those with kidney or liver impairment. This requirement reflects the evidence that these groups may metabolize the medicine differently, necessitating individualized care.

Q: What is Stable used for besides the main condition?

In addition to reducing high blood pressure, the active ingredient is also officially indicated for treating severe hypertension in pregnancy, known as eclampsia. It is also used in combination with another drug for certain patients with a specific type of heart failure (Heart Failure with Reduced Ejection Fraction or HFrEF).

Q: How long does Stable usually take to start working?

According to pharmacokinetic data, for the oral tablets, peak plasma levels are typically reached 1 to 2 hours after the medicine is taken. The effects of the injectable solution are more rapid, with blood pressure reduction potentially beginning within 10 to 30 minutes.

Q: Is there a generic version of Stable available?

Yes, the active ingredient in Stable, Hydralazine Hydrochloride, is widely available as a generic product. Generic versions are typically lower in cost than the brand-name medicine.

Q: How long do the effects of Stable last?

Pharmacokinetic information states that the medicine's plasma levels decline with a half-life of approximately 3 to 7 hours. This relatively short duration of action is why it is often prescribed to be taken multiple times a day to maintain a stable level in the body.

Q: What happens if I suddenly stop taking Stable?

Official warnings indicate that due to the medicine's relatively short duration of action, suddenly stopping use or missing doses may potentially lead to a rebound or rapid increase in blood pressure.

Q: Is Stable a controlled substance or habit-forming?

The active ingredient in this medicine is not classified as a controlled substance by regulatory agencies. Therefore, it is not considered to be habit-forming.

Q: Are there any specific medical tests needed before starting Stable?

Official guidelines state that the prescribing clinician may order specific laboratory tests, such as a complete blood count (CBC) and an antinuclear antibody (ANA) test, before starting therapy. These tests are often repeated periodically during prolonged treatment.

Q: Does Stable change how I feel emotionally?

The official adverse reaction profile lists changes in mood as a possible side effect. Patients who experience a change in mood or behavior while taking the medicine are typically advised to discuss this with their health professional.

Q: Are there any known interactions between Stable and caffeine?

Pharmacological studies suggest that caffeine may potentially augment (increase) the activity of medicines classified as vasodilators, like Stable. It is generally advised that individuals discuss their caffeine consumption with a health professional if they have concerns about this potential interaction.

Q: Does Stable cause weight gain or weight loss?

While not listed as a common effect, regulatory documents note that significant weight loss can be a symptom associated with the serious Lupus Erythematosus-like Syndrome adverse reaction. This reaction is generally linked to prolonged use and high doses of the medicine.

Q: Is there an official patient information leaflet for Stable?

Yes, regulatory authorities require that an official Medication Guide or Patient Information Leaflet be provided with all prescription medicines. This material can typically be obtained from the dispensing pharmacist or found in official online sources.

Q: Does Stable affect the results of any common lab tests?

The medicine requires monitoring with specific lab tests. During prolonged therapy, a health professional may order periodic blood tests, including a complete blood count (CBC) and an antinuclear antibody (ANA) test, to check for potential changes.

Q: Why do some people say Stable didn't work for them?

Studies and official documents indicate that the medicine is metabolized differently among individuals based on genetic factors known as acetylator status. This difference in how the body processes the medicine can result in varying plasma levels, which in turn may affect the individual's response to the treatment.

How should Stable be stored and disposed of?

How to Store and Dispose of Stable (Hydralazine)

Official regulatory guidelines dictate specific storage and disposal requirements for Stable (Hydralazine Hydrochloride) to maintain product integrity.


Storage and Handling

Stable Oral Tablets must be stored at Controlled Room Temperature, defined as 20 C to 25 C (68 F to 77 F). The tablets should be kept in the original container and must remain tightly closed. The Injectable Solution must be protected from light and not be frozen; its stability is limited after dilution.

All forms of this medication must be stored out of the sight and reach of children.


Disposal Instructions

Unused, expired, or unwanted Stable must be disposed of according to local regulations. The product should not be flushed down the toilet or poured into wastewater unless official guidance specifically permits this method.

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

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Equivalent of Stable found in:

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