Ascalan

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Medically reviewed

Rosario Oropesa

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 Ascalan

Property Description
Active Ingredient Doxazosin Mesylate
Form Tablet (Standard and Extended-release)
Pharmacological Class Alpha-Adrenergic Blocking Agent (Alpha-blocker)
General Purpose Smooth muscle relaxation and vasodilation
Origin Synthetic (Quinazoline derivative)

What Type of Medicine is Ascalan (Doxazosin)?

Ascalan is the trade name for a synthetic prescription medication whose core component is the active ingredient, Doxazosin Mesylate. Chemically defined as a Quinazoline derivative, it belongs to the class of Alpha-Adrenergic Blocking Agents, more commonly known as alpha-blockers. Doxazosin functions as a post-synaptic alpha1-adrenergic receptor antagonist, a specific action that distinguishes it within its therapeutic category. This means the drug works by selectively blocking signals that lead to muscular and vascular constriction. Ascalan is supplied as a single-ingredient product (Monotherapy), deriving its effect entirely from Doxazosin.

Composition and Available Form

The medication's composition is centered on Doxazosin Mesylate (INN), which is combined with standard pharmaceutical excipients necessary for creating the final oral preparations. Ascalan is designed for Oral administration and is available as a standard Tablet and an Extended-release tablet. The extended-release form, often structured as a GITS, provides a continuous, steady release of Doxazosin over an extended duration. This design feature is intended to maintain consistent physiological action throughout the day, as Doxazosin facilitates the relaxation of muscles in blood vessel walls and other areas of the body.

General Purpose and Physiological Action

The fundamental purpose of Doxazosin is to facilitate the relaxation of smooth muscles and promote the widening of blood vessels (vasodilation). This action is achieved by Doxazosin acting as an alpha1-adrenergic receptor antagonist, blocking the specific receptors responsible for contraction. The resultant relaxation eases muscular tension in localized areas, such as the lower urinary tract, and reduces the overall resistance in the blood vessels. This effect establishes the drug's general utility in managing issues related to high vascular tension and muscle obstruction, such as those experienced by adult patients.

What side effects are possible with Ascalan?

Possible Side Effects and Safety Information

The safety profile of Ascalan (Doxazosin Mesylate) is formally classified by regulatory authorities based on the expected frequency of documented adverse reactions. These effects are grouped by the affected System-Organ Class, reflecting the drug’s action as an alpha-blocker.


Frequency Classification and Organ Systems

The most frequently reported events, classified as Common (ge 1/100 to <1/10), typically involve the Nervous System (e.g., dizziness, headache, somnolence) and Vascular Disorders, particularly postural hypotension (low blood pressure upon standing). Other common effects include fatigue and nausea.

Less common events, classified as Uncommon (ge 1/1,000 to <1/100), include Syncope (loss of consciousness), Cerebrovascular accident, and Impotence. Very Rare events (<1/10,000) include Priapism, Cholestasis, Hepatitis, and Leukopenia, as documented in official prescribing information.


Regulatory Safety Considerations

The regulatory profile highlights that the risk of postural hypotension and Syncope is highest during the commencement of therapy or following an increase in dosage strength. The official label also addresses specific patient constraints:

  • Hypersensitivity: The medicine is contraindicated in patients with a known hypersensitivity to Doxazosin or other Quinazoline derivatives.
  • Hepatic Impairment: Use is not recommended in individuals with severe hepatic impairment, and caution is necessary in those with mild to moderate impairment.

This structure ensures a clear, formal description of the medicine's known safety characteristics, distinguishing between expected reactions and rare, serious events.

Overdose and Emergency Response

The official regulatory profiles for Ascalan (Doxazosin Mesylate) define overdose primarily as an extreme exaggeration of the drug's intended action, leading to severe circulatory compromise.

Documented Manifestations and Urgent Action

The most consistently documented clinical presentation of an overdose is profound hypotension, a severe drop in blood pressure resulting from excessive alpha-1 adrenergic blockade. This condition may present with secondary symptoms such as dizziness, drowsiness (somnolence), and changes in heart rate. The severity of hypotension carries the risk of life-threatening outcomes, including syncope (loss of consciousness) and seizure. Immediate medical attention must be sought when these severe manifestations occur, or if profound low blood pressure is suspected.

Management and Regulatory Requirements

Regulatory guidance mandates that treatment for an Ascalan overdose be symptomatic and supportive. The immediate goal of professional intervention is to restore blood pressure and normalize heart rate. Procedures may involve removing unabsorbed drug from the gastrointestinal tract and administering fluid volume expanders or vasopressor agents to counteract the low blood pressure. It is officially stated that no specific antidote is known for Doxazosin Mesylate. Therefore, patients require close hospital monitoring of vital signs until they are medically stable and the threat of severe circulatory compromise has passed. The overdose profile is structurally focused on the need to correct this circulatory failure through supportive treatment.

Therapeutic Uses of Ascalan

What Ascalan Treats: Main Uses and Benefits

Ascalan is commonly used to help with situations involving symptoms related to physical discomfort and conditions presenting with systemic or localized discomfort. This medication is applied in addressing conditions characterized by episodic or fluctuating manifestations that create noticeable interference with daily comfort. It is relevant in contexts where supportive symptom management is appropriate.


Symptom and Condition Management

Ascalan is used for managing symptoms related to heightened physiological activity, symptoms that interfere with daily functioning, and symptoms associated with acute or episodic changes. It helps address symptom clusters that may become intense or disruptive, often used when symptoms intensify and supportive relief is needed. This medication contributes to easing the overall symptom burden: “provides support that helps ease the overall symptom burden,” which helps patients cope more steadily with difficult episodes across various condition categories.


Focus on Symptom Support

Supportive Management During Disruptive Episodes
Ascalan assists with maintaining functional stability when symptoms become momentarily overwhelming.

Eligibility and Restrictions for Use

Population Eligibility and Contraindications

Ascalan (Doxazosin Mesylate) use is officially restricted to adult patients (aged 18 years and older) and is defined by specific regulatory contraindications and limitations established in authoritative labeling.

Absolute Exclusions

Ascalan must not be used if a patient has a known hypersensitivity to doxazosin, any other quinazoline derivative (such as prazosin or terazosin), or any of the product’s excipients. The medication is also formally contraindicated for patients with a documented history of orthostatic hypotension and is contraindicated during lactation.

Conditional Use and Age Restrictions

Safety and efficacy are not established for the pediatric population (under 18 years), and its use is not recommended in children. Conditional use is applied based on organ function: the drug is not recommended for patients with severe hepatic impairment due to a lack of clinical data. Furthermore, as monotherapy for BPH, Ascalan is contraindicated in patients with specific complications such as overflow bladder or anuria. Pregnant women should only use the medicine if the potential benefit justifies the potential risk, as safety has not been established.

What should I know about interactions with other medicines?

Interactions with other medicines and products

Ascalan (Doxazosin) interacts with certain drug classes and substances due to its metabolism and pharmacological action, as documented in official regulatory labeling.

Pharmacokinetic and Metabolic Interactions

Ascalan is officially classified as a CYP3A4 substrate. The co-administration of strong CYP3A4 inhibitors (such as Ketoconazole or Ritonavir) can reduce the clearance of Doxazosin, resulting in anticipated increased plasma exposure. Furthermore, the co-administration of Cimetidine has been documented to result in a 10% increase in the mean Area Under the Curve (AUC) of Doxazosin.

Pharmacodynamic Interactions

Co-administration with Phosphodiesterase-5 (PDE-5) Inhibitors (e.g., Sildenafil, Tadalafil, Vardenafil) can lead to additive blood pressure lowering effects and symptomatic hypotension. This additive effect is also possible with other antihypertensive medications or vasodilating agents. Concomitant consumption of alcohol can similarly augment the hypotensive effect, increasing the risk of orthostatic hypotension.

Restrictions and Population Notes

The use of Ascalan is formally contraindicated in patients with a known hypersensitivity to Doxazosin or other quinazoline derivatives. The regulatory label for PDE-5 inhibitors states that therapy should be initiated at the lowest recommended dose in patients already taking Ascalan. For individuals with hepatic impairment, Doxazosin clearance is reduced, and use is not recommended in cases of severe impairment.

Mechanism of Action

Action on Alpha-1 Adrenergic Receptors

Ascalan functions as an antagonist at postsynaptic alpha-1 adrenergic receptors (alpha1-ARs) located on smooth muscle cells throughout the body, including the vasculature and certain stromal tissues. This molecular interaction inhibits the binding of the natural signaling molecule, norepinephrine, to its receptor sites.

Modulation of Peripheral Smooth Muscle Tone

The alpha1-AR blockade interrupts the sympathetic nervous system's command signals which typically trigger muscle contraction. This interference with the signaling pathway results in a reduction of myogenic tension and causes the relaxation of peripheral smooth muscles (vasodilation).

Effect on Systemic Vascular Resistance

The resulting relaxation of the smooth muscle tissue in the arterial walls directly leads to vessel widening. This physiological consequence reduces the overall systemic vascular resistance within the circulatory system, modulating the dynamics of blood flow.

Dosage and Administration Information

How to Use Ascalan (Doxazosin)

Ascalan is an oral medication administered in a standardized, once-daily regimen. Its use involves a titration schedule that begins with the lowest effective dose and is slowly increased over time to ensure consistent effect and patient comfort.


Dosing and Administration

A careful, systematic approach is used for initial dosing. For the standard tablet, therapy is initiated at 1 mg once daily. The dose is typically adjusted by doubling at intervals of one to two weeks until the intended maintenance range is reached, which may extend up to 8 mg once daily. The maximum allowable dose is 16 mg once daily.

Timing and Form-Specific Rules

Ascalan may be taken with or without food when using the standard tablet form. The extended-release formulation often starts at 4 mg once daily, with a maximum of 8 mg once daily. Crucially, the extended-release tablets must be swallowed whole and not chewed, divided, or crushed to protect the specialized coating that ensures the medicine is released slowly throughout the day.

Special Population Rules

While no specific mandatory dose change is required for older adults or patients with renal impairment, patients with hepatic impairment (impaired liver function) require careful dose titration and may require lower doses. If treatment is stopped for several days, it must be restarted using the initial lowest dosing regimen and slowly re-titrated to the desired level.

Recent Clinical Evidence

Research evidence / Overview of studies for Ascalan

Evidence for Use in Managing Symptoms of Lower Urinary Tract Obstruction

Research on Ascalan was evaluated in the context of physical obstruction in the lower urinary tract, where it was observed in conditions marked by functional limitations such as issues with urinary flow. The core evidence was evaluated in Randomized Controlled Trials (RCTs), where short-term trials compared Ascalan to an inactive placebo and observed patterns related to symptom changes.

The main outcomes related to physical discomfort research examined included objective flow rates and subjective symptom reporting, using tools like the International Prostate Symptom Score (I-PSS). Research examined both flow metrics and patient-reported symptom scores for groups receiving Ascalan and placebo. Data gathered was largely focused on men, meaning data for other populations remain insufficient. There is limited information for long-term outcomes regarding the durability of the reported symptom changes over many years.


Evidence for Use in Managing Systemic Vascular Tension

Ascalan was studied for situations characterized by systemic high vascular tension. The evidence base includes short-term RCTs and large, long-term comparative outcome trials that research examined over several years. The primary measurements tracked were Systolic and Diastolic Blood Pressure.

Research describes patterns where Ascalan administration was associated with blood pressure readings. Furthermore, in large-scale comparative research, outcomes related to systemic or functional imbalance was observed in these studies. A key limitation of this evidence base relates to a specific large comparative trial, where the long-term monitoring was limited in scope for one study arm, meaning comparative evidence is limited regarding long-term cardiovascular outcomes.


Research in Specific Groups and Remaining Research Uncertainty

Ascalan was evaluated in studies that included large numbers of older adults and patients with co-existing conditions such as diabetes or elevated cholesterol. However, data for certain groups, such as children, pregnant populations, or specific comorbidity groups, remain insufficient. The results apply only to the populations studied, which means research does not determine whether an individual will respond similarly.

Key Studies & References

  1. Label: DOXAZOSIN tablet - Indications and Usage for Benign Prostatic Hyperplasia (BPH) and Hypertension
  2. NICE guideline on hypertension in adults: diagnosis and management (Includes evidence review on alpha-blockers in treatment algorithm)

Frequently Asked Questions (FAQ)

Common questions about Ascalan (FAQ)

Q: Is Ascalan a generic drug or a brand name?

Ascalan is the trade name (or brand name) given to this medication. The medicine is supplied as a single-ingredient product, and its active component is Doxazosin Mesylate.

Q: Is Ascalan available without a prescription?

No, Ascalan is classified as a Human Prescription Drug in official documentation. Therefore, it is only available with a valid prescription from a healthcare provider.

Q: Is Ascalan an anti-inflammatory drug?

No, Ascalan is classified as an Alpha-Adrenergic Blocking Agent, often called an alpha-blocker. Its mechanism of action involves relaxing smooth muscles and widening blood vessels, and it is not classified as an anti-inflammatory drug.

Q: Is Ascalan considered a first-line treatment?

Clinical trial analysis suggests that alpha-blockers like Ascalan are generally not employed as initial, first-line monotherapy for uncomplicated hypertension (high blood pressure). Its use should align with established treatment protocols.

Q: How long does it typically take to see the effects of Ascalan?

The time required to see effects can vary based on the condition being addressed. For managing blood pressure, the maximum effect often occurs within 2 to 6 hours after a dose. For BPH symptoms, studies show that significant improvement is typically observed after 1 to 2 weeks of starting treatment.

Q: How long do the therapeutic effects of Ascalan last?

Ascalan is prescribed to be taken once daily because the medicine's effect is sustained throughout the entire 24-hour period. Official regulatory information indicates the drug has an elimination half-life of about 22 hours.

Q: Is Ascalan intended for short-term use or long-term management?

The medicine is generally intended for long-term management of chronic conditions, such as high blood pressure or BPH symptoms. Clinical studies have examined its use over several years and have not observed a loss of effectiveness (tolerance) over time.

Q: Does Ascalan address the cause of the condition or just the symptoms?

Official information states that Ascalan is designed to relieve symptoms by relaxing smooth muscles and improving flow. It works to manage symptoms of conditions like BPH and high vascular tension, but it does not treat the underlying cause of the condition.

Q: Does Ascalan cause common side effects like weight gain or fatigue?

Regulatory safety documents report fatigue as a commonly occurring side effect. However, the official safety profile does not list weight gain as a common, uncommon, or very rare adverse reaction.

Q: Is it normal to have mild stomach upset after starting Ascalan?

Mild stomach upset is a possibility, as common side effects listed in the regulatory label include nausea and abdominal pain. Common side effect management strategies often include taking the medication with food.

Q: Can Ascalan cause an allergic reaction?

Yes, official product information states that Ascalan is formally contraindicated if a patient has a known hypersensitivity to the active ingredient, Doxazosin, or related components.

Q: When should I be concerned about a reaction or side effect from Ascalan?

Official patient counseling information notes serious symptoms that warrant immediate review by a healthcare professional. These include a rapid or irregular heartbeat, new or worsening chest pain, severe light-headedness or fainting, or a painful erection lasting more than four hours.

Q: Can people with pre-existing heart conditions use Ascalan?

Caution is advised for patients with certain pre-existing heart conditions. Ascalan may potentially cause or worsen chest pain (angina), and the decision regarding its use is subject to a full assessment by a healthcare provider.

Q: Is it safe to drink alcohol while undergoing treatment with Ascalan?

Official regulatory warnings indicate that drinking alcohol while taking this medicine can increase its blood pressure-lowering effect. This can significantly increase the risk of side effects like dizziness, lightheadedness, or fainting.

Q: Are there any known food or beverage interactions with Ascalan?

The standard tablet formulation of Ascalan may be taken with or without food as food is not expected to interfere with its effectiveness. Specific interactions with other beverages are not listed in the official label.

Q: Can I take Ascalan with common over-the-counter pain relievers?

Official regulatory information notes that Non-Steroidal Anti-Inflammatory Drugs (NSAIDs) may decrease the effectiveness of Ascalan. Regulatory guidelines note the importance of a patient discussing the use of OTC pain relievers with their prescribing physician.

Q: Does Ascalan interact with herbal supplements or vitamins?

Official regulatory warnings highlight the importance of discussing all herbal products, vitamins, and supplements with a healthcare provider. This is because these products may interact with Ascalan or reduce its overall effectiveness.

Q: What happens if I forget to take Ascalan when scheduled?

Regulatory information provides guidance for managing a missed dose, which typically involves taking the dose if remembered soon, or skipping the dose if it is close to the next scheduled time. Patients should consult the official patient information for specific directions.

Q: Can I stop taking Ascalan suddenly?

Regulatory documents state that if treatment is interrupted for several days or longer, the standard procedure is to restart at the initial lowest dosing regimen and gradually titrate the dose. This process underscores the need for professional supervision when discontinuing the medicine.

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

Official patient counseling information states that, due to the risk of drowsiness, restrictions apply to driving or operating machinery for 24 hours after the first dose or a dose increase. Patients should be aware of this risk before performing such activities.

Q: What kind of monitoring or lab tests are required while taking Ascalan?

Official information states that monitoring may be required. This can include checking blood pressure for several hours after the first dose or a dose increase. For BPH (prostate) treatment, monitoring may also include specific medical tests like a rectal exam.

Q: Why do some users report that Ascalan did not work for them?

Official documentation indicates that individual patient response to treatment can vary significantly. Clinical studies report results that apply to the populations studied and cannot determine whether a specific individual will experience the exact same therapeutic results.

Q: Where can I find authoritative evidence about Ascalan research?

The primary authoritative source for the medicine's research and evidence is the official regulatory labeling. This includes documents like the FDA Prescribing Information or the EMA Summary of Product Characteristics (SmPC).

Q: How long after stopping Ascalan will it be fully out of my system?

The medicine has an elimination half-life of approximately 22 hours. Based on this measurement, the medicine is generally considered to be completely eliminated from the body within about 4 to 5 days after the last dose.

How should Ascalan be stored and disposed of?

How to Store and Dispose of Ascalan?

The official regulatory documents specify precise conditions for storing Ascalan (Doxazosin Mesylate) and strict procedures for its disposal.

Storage and Handling

Ascalan must be stored at controlled room temperature, specifically between 20^circC to 25^circC (68^circF to 77^circF), and must be protected from excess moisture, direct light, and heat. The product must not be frozen. Keep the medication in the container it came in, ensure the container is tightly closed, and always store it out of the sight and reach of children.

Disposal Requirements

Disposal should be carried out according to local requirements, with the preferred method being a community drug take-back program. Regulatory guidelines prohibit flushing this medication down the sink or toilet. If a take-back program is unavailable, expired or unused tablets must be mixed with an undesirable substance, sealed in a bag, and placed in the household trash.

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

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