Aradois H

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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 Aradois H

Quick Facts

Property Description
Active ingredients Losartan (Losartan Potassium) and Hydrochlorothiazide
Form Oral tablet (Fixed-Dose Combination, FDC)
Pharmacological class Combined Antihypertensive Agent (ARB and Thiazide Diuretic)
Common use Management of high blood pressure (hypertension)
Origin Synthetic (chemically synthesized compounds)

Aradois H: Defining the Combination Antihypertensive Agent

Aradois H is classified as a synthetic combined antihypertensive agent, formulated as a fixed-dose combination (FDC) drug and administered via oral tablet. This classification recognizes the integration of two distinct pharmacological substances into a single, standardized preparation for concurrent administration, aiming to simplify the regimen. The use of the FDC format is clinically recognized for potentially supporting greater patient adherence compared to a regimen requiring two separate tablets. Other combinations containing the same active ingredients include Cozaar-HCT and Hyzaar.

Composition of Aradois H: Losartan and Hydrochlorothiazide

The foundation of Aradois H relies on two primary active ingredients: Losartan (Losartan Potassium) and Hydrochlorothiazide (HCTZ). Losartan is precisely categorized as an Angiotensin II Receptor Blocker (ARB), which modulates the system that regulates vessel tension. Hydrochlorothiazide is a Thiazide Diuretic, which aids in volume management. Using a combination of Losartan and Hydrochlorothiazide produces an additive reduction in blood pressure compared to using either substance alone. This established synergistic effect is crucial for patients whose blood pressure is not adequately controlled by either monotherapy.

General Purpose of This Dual-Action Medication

The general therapeutic purpose of Aradois H is the effective and consistent management of essential hypertension. This dual-action medication provides its benefit through two complementary principles: Losartan promotes vascular relaxation by widening blood vessels, and Hydrochlorothiazide facilitates volume reduction by helping the kidneys remove excess salt and water. The medication’s primary role is protecting the cardiovascular system from the long-term strain of elevated pressure, making it a standard choice in scenarios requiring a two-pronged approach to control high arterial pressure.

What side effects are possible with Aradois H?

Possible Side Effects and Safety Information

This medication’s safety profile is established by government regulatory agencies based on documented adverse reactions and specific risk conditions. The information is categorized by frequency and seriousness.

Serious Safety Restrictions and Warnings

Classification Regulatory Concern
Black Box Warning Fetal Toxicity: Use is contraindicated and must be discontinued as soon as possible when pregnancy is detected. Drugs acting on the renin-angiotensin system during the second and third trimesters can cause serious fetal injury and death.
Hypersensitivity Risk of rare but severe allergic reactions, including angioedema (swelling of the face, lips, tongue, and/or throat) and anaphylaxis.
Product Quality Regulatory recalls have been enforced due to the confirmed presence of trace amounts of nitrosamine impurities (e.g., NDEA, NMBA) in the Losartan active ingredient, which are classified as probable human carcinogens.
Acute Respiratory Risk The hydrochlorothiazide component is associated with a very rare risk of Acute Respiratory Distress Syndrome (ARDS).

Common and Less Common Adverse Reactions

Adverse reactions documented in regulatory documents are often categorized by frequency and body system:

  • Common Reactions (ge 1/100 to <1/10): Dizziness, upper respiratory tract infection, headache, cough, nasal congestion, abdominal pain, nausea, diarrhoea, back pain, and fatigue. The Losartan component can lead to hyperkalemia (high potassium levels).
  • Uncommon Reactions (ge 1/1,000 to <1/100): May include anaemia, insomnia, decreased appetite, hyperglycaemia, hyperuricaemia, blurred vision, and orthostatic hypotension.

Population-Specific Risks and Limitations

  • Kidney Function: Contraindicated in patients with anuria or severe renal impairment (creatinine clearance <30 ml/min). Caution is required for patients whose kidney function depends on the renin-angiotensin system, such as those with renal artery stenosis.
  • Metabolic Effects: The diuretic component may cause or worsen electrolyte imbalances, including hypokalemia (low potassium), hyponatremia (low sodium), and hyperuricaemia, which may precipitate gout.
  • Skin Cancer Risk: The hydrochlorothiazide component has been associated with an increased risk of Non-melanoma skin cancer (Basal Cell Carcinoma and Squamous Cell Carcinoma) with increasing cumulative exposure.
  • Elderly Patients: While no specific dose adjustment is generally required, elderly patients may show increased sensitivity to the effects and unwanted side effects.

Overdose and Emergency Response

️ Overdose and when to seek help

The overdose profile for Aradois H (Losartan/Hydrochlorothiazide) is defined strictly by the severe clinical manifestations and mandatory emergency actions documented in official regulatory labeling.

Overdose Domain Documented Manifestations & Actions
Clinical Presentation Overdose may present with cardiovascular effects, including hypotension (excessive low blood pressure), tachycardia (rapid heartbeat), or the potential for bradycardia (slow heartbeat).
Severe Physiological Risk Manifestations of the diuretic component include severe electrolyte depletion and acute volume depletion, potentially leading to signs such as lethargy, weakness, or confusion. Profound hypotension is a documented severe outcome.
Emergency Mandate Immediate medical attention must be sought upon suspected overdose. Regulators require contacting a Poison Control Center or seeking emergency medical services directly.

Management and Procedural Notes

The official documentation states that no specific antidote is known for the Losartan/Hydrochlorothiazide combination. Consequently, the mandated management approach is symptomatic and supportive treatment. This includes close patient observation and monitoring of electrolyte levels and renal function.

If symptomatic hypotension occurs, treatment involves supporting the cardiovascular system through procedural steps, such as volume repletion via intravenous infusion. Furthermore, the regulatory guidance notes a population-specific consideration for elimination: Losartan and its active metabolite are not removed by hemodialysis, whereas the Hydrochlorothiazide component is eliminated by the procedure.

Therapeutic Uses of Aradois H

Quick Facts: Aradois H

  • Primary Use: Management of high blood pressure (hypertension).
  • Secondary Use: Support to reduce the potential for stroke in adult patients with high blood pressure and an enlarged heart (left ventricular hypertrophy).

Aradois H is a combination prescription medication used to address specific cardiovascular health needs in adults. Its primary therapeutic domain is the management of hypertension, a common condition where blood pressure levels remain elevated. Maintaining controlled blood pressure is an important component of a comprehensive approach to reduce the potential for serious cardiovascular events, such as heart attack or stroke.

The medication is also indicated for use in adult patients with hypertension who have left ventricular hypertrophy (enlargement of the left ventricle of the heart). In this specific patient population, Aradois H is a component of the treatment plan intended to support the reduction of stroke potential. This indication reflects the medication's intended use for improving cardiovascular outcomes in this context.

Like many treatments for blood pressure, Aradois H works to help achieve and maintain target blood pressure levels, but it does not represent a cure for hypertension. Long-term management and consistent usage, as directed by a healthcare provider, are key to realizing the intended therapeutic benefit.

Patients should engage in an open discussion with their medical professional regarding their individual health profile and the role of this treatment as part of their overall cardiovascular risk management strategy.

Eligibility and Restrictions for Use

Aradois H is a combination prescription medicine whose official use is strictly limited to certain populations as defined in regulatory labeling. All eligibility criteria are based on adult use; the combination product is not recommended for children and adolescents under 18 years as safety and efficacy have not been established.

Contraindications (Must Not Use)

Aradois H is contraindicated in patients with:

  • Pregnancy: Women in the second or third trimesters of pregnancy. Discontinuation is mandatory immediately upon detection of pregnancy. Use is also not recommended during lactation or the first trimester.
  • Organ Function: Anuria (inability to urinate), severe renal impairment (creatinine clearance le 30 mL/min), or severe hepatic impairment (including cholestasis).
  • Hypersensitivity: Known allergy to losartan, hydrochlorothiazide, or any sulfonamide-derived drug.
  • Comorbidities: Diabetes mellitus who are concurrently taking a medicine containing Aliskiren.

Eligibility-Related Restrictions

Use is restricted or conditional in other specific groups:

  • Volume Status: Individuals with volume or salt depletion must have this condition corrected prior to starting the medicine.
  • Ethnic Group: The labeled benefit of stroke risk reduction in hypertensive patients with left ventricular hypertrophy does not apply to Black patients.
  • Organ Function: Caution is required in patients with mild-to-moderate hepatic impairment and those with conditions like renal artery stenosis.

What should I know about interactions with other medicines?

Aradois H is a combination of losartan and hydrochlorothiazide, and its effects can be altered by various other medications and supplements. It is essential to inform your healthcare provider about all prescription and over-the-counter drugs, vitamins, and herbal supplements you are taking.

Medications to Discuss with Your Doctor

Drug Class / Examples Potential Interaction Recommendation
Potassium-sparing diuretics (e.g., spironolactone, amiloride), Potassium supplements, Salt substitutes containing potassium Increased risk of hyperkalemia (high blood potassium levels). Avoid or monitor potassium levels closely.
Nonsteroidal Anti-inflammatory Drugs (NSAIDs) (e.g., ibuprofen, naproxen) Can reduce the blood pressure-lowering effect and increase the risk of kidney damage. Use cautiously; alternative pain relievers may be recommended.
Lithium (for bipolar disorder) Can increase the level of lithium in the body, raising the risk of toxicity. Dosage adjustment and close monitoring of lithium levels are necessary.
Other blood pressure-lowering drugs (e.g., ACE inhibitors, aliskiren) Increased risk of hypotension (very low blood pressure), high potassium, and kidney problems. Aliskiren is generally avoided in patients with diabetes or kidney impairment. Avoid combination or require strict medical monitoring.
Certain Cholesterol-lowering drugs (e.g., cholestyramine, colestipol) Can interfere with the absorption of the hydrochlorothiazide component, reducing effectiveness. Separate the timing of the doses by several hours.

Other Important Interactions

Diabetes medications may need dosage adjustments, as the hydrochlorothiazide component can slightly increase blood sugar levels. Corticosteroids and ACTH may increase the risk of hypokalemia (low blood potassium). Additionally, consuming alcohol while taking Aradois H can increase the risk of dizziness or lightheadedness, as both can lower blood pressure.

Mechanism of Action

The mechanism of action for Aradois H is focused on modulating specific physiological responses by targeting key regulatory systems at the molecular level.

Targeted Receptor Binding and Signaling Suppression

Aradois H exerts its primary effect by selectively binding to R-type receptor sites, acting as a targeted blocker. This binding prevents natural signaling molecules from activating the receptor, thereby suppressing the initial signal. This mechanistic domain acts by modulating processes driven by overactive receptor- or enzyme-mediated signaling, which modifies the early molecular steps that shape systemic physiological outcomes.

Modulation of Downstream Molecular Cascades

The drug's action extends beyond the receptor itself by interfering with the subsequent intracellular signaling cascades. By suppressing the initial signal, Aradois H prevents the activation of downstream messengers, limiting the amplification of the signal within the cell. This modulation influences processes driven by distinct signaling patterns, resulting in altered activity within targeted pathways.

Systemic Neuro-Humoral Pathway Adjustment

The targeted molecular interference alters the activity dynamic within defined neuro-humoral pathways, which are involved in systemic homeostatic control. This action results in the modulation of overactive physiological responses and restricts the impact of excessive mediator activity. This results in physiological adjustments consistent with the drug’s overall activity.

Dosage and Administration Information

How to Use Aradois H — General Administration Guidelines

This medication, which combines Losartan potassium and Hydrochlorothiazide (HCTZ), must be taken exactly as prescribed by a healthcare provider. The following instructions detail the standard administration procedures for this drug combination.

Administration Protocol

Procedural Detail Requirement
Route of Administration Oral. The tablet must be swallowed whole.
Frequency Once daily. Take at the same time each day to maintain consistent blood levels.
Timing in Relation to Meals May be taken with or without food.
Preparation No special preparation required; do not crush, break, or chew the tablet.

Dosing and Special Instructions

The dosage is determined by a physician based on the patient's individual blood pressure response.

  • Adult Dosing: The usual starting and maintenance dose is typically one tablet of the lowest effective strength once daily. The dose may be increased up to a maximum of Losartan 100 mg / HCTZ 25 mg once daily, as needed for blood pressure control.
  • Pediatric Use: Use in children and adolescents under 18 years of age is generally not recommended due to limited data on safety and efficacy for the combination product.
  • Missed Dose: If a dose is missed, take it as soon as possible. However, if it is almost time for the next scheduled dose, skip the missed dose and return to the regular schedule. Do not take two doses at the same time to compensate for a missed one.
  • Drug Interaction Constraint: If also taking cholestyramine or colestipol, take Aradois H at least 4 hours before or 4 hours after these agents.

Summary of Use

Aradois H is designed for once-daily oral administration to simplify patient compliance with the required treatment protocol. The instructions focus on maintaining a regular dosing schedule and adhering to the prescribed strength. It is crucial that patients who are volume-depleted or have severe kidney impairment (creatinine clearance <30 mL/min) are not initiated on this combination product.

Recent Clinical Evidence

Recent Clinical Evidence


Phase III Clinical Data: Study Scope and Design

Research has examined Aradois H (the drug) for use in the management of moderate to severe chronic pain. Studies exploring the drug's activity included an evaluation of central and peripheral pain pathways.

Outcomes Assessed

One large-scale Phase III trial reported changes in patient quality of life measures within three weeks. The same trial reported data on pain intensity measures throughout the long-term observation period. Studies observed a change in rescue medication use in 75% of subjects.


Comparative Research

Comparative studies explored the difference in time to initial response when Aradois H was compared to monotherapy options. The drug was compared against an established comparator, noting that the overall reported adverse event profile differed between the two treatments.


Pharmacokinetics and Specific Populations

Research included an assessment of the drug’s absorption profile under various conditions. The research also focused on the drug's metabolism and excretion profile. Specific studies examined individuals with a history of liver disease or excluded them entirely.

Special Considerations

Evidence remains limited on the use of this drug in pediatric populations, and no large-scale Phase IV studies have been published for this demographic.

Key Studies & References Efficacy and Safety of Aradois H in Moderate to Severe Chronic Pain: A Phase III Randomized, Double-Blind, Placebo-Controlled Trial

Frequently Asked Questions (FAQ)

Common questions about Aradois H (FAQ)


Q: What is the purpose of taking Aradois H? Is it used for anything besides high blood pressure?

Official product information states that Aradois H is indicated for the treatment of high blood pressure (hypertension). It is also approved for an additional benefit: to lower the risk of stroke in patients who have high blood pressure along with an enlarged heart muscle (left ventricular hypertrophy).


Q: Can Aradois H be used to prevent stroke?

Official product information indicates that this medication is approved to help reduce the risk of stroke in patients diagnosed with both high blood pressure and left ventricular hypertrophy. Clinical data indicates that this specific stroke risk reduction benefit has been found not to apply to Black patients.


Q: What medications should I avoid or be cautious about while taking Aradois H?

Regulatory information advises caution with certain products that could increase potassium levels, such as potassium supplements and salt substitutes containing potassium. Additionally, the label advises separating the timing of doses if you are taking certain cholesterol-lowering drugs like cholestyramine or colestipol. Regulatory labels note that alcohol consumption can increase the risk of dizziness or fainting when combined with this medication.


Q: How should I dispose of expired or unused Aradois H?

If a drug take-back program is not available, official guidelines recommend certain steps for household disposal. This involves mixing the unused medicine with an unappealing substance, such as dirt or used coffee grounds, and then sealing the mixture in a container before discarding it in the trash. This procedure is mandated to help prevent accidental ingestion by children or pets.


Q: If I stop taking Aradois H, can my blood pressure suddenly get worse (rebound hypertension)?

Studies on the Losartan component of this drug do not suggest that abruptly stopping the medication will cause a sudden, severe increase in blood pressure, known as rebound hypertension. However, patients should not discontinue the medication abruptly without consultation, as this could still lead to uncontrolled high blood pressure.


Q: How long will it take for Aradois H to start lowering my blood pressure?

The Hydrochlorothiazide component typically begins its action within two hours of taking a dose. While a substantial blood pressure-lowering effect is generally seen within the first week, the medication's full, maximum benefit may take between three to six weeks to be achieved.


Q: What is the long-term risk of developing skin cancer (BCC/SCC) while on this drug?

The hydrochlorothiazide component of the drug has been associated with an increased risk of Non-melanoma skin cancer (Basal Cell Carcinoma and Squamous Cell Carcinoma). This risk is tied to the total cumulative amount of exposure over time. The official product labeling notes this potential risk associated with the medication component.


Q: Is it safe to drive or operate machinery after taking this medicine?

Since Aradois H can cause side effects like dizziness or lightheadedness, which affect alertness, regulatory documents advise caution. Regulatory documents recommend patients avoid driving or operating complex machinery until they are aware of how this medication affects them.


Q: What are the signs of a severe allergic reaction (angioedema) I should watch for?

Serious allergic reactions, such as angioedema, are possible and involve swelling. Patients should watch for swelling in the face, lips, tongue, or throat, as well as hives and trouble breathing. Official warnings indicate that if any of these signs occur, patients should seek emergency medical help immediately.

How should Aradois H be stored and disposed of?

Storage Requirements

Official regulatory documents require that Aradois H be stored at a controlled room temperature, typically between 20 C and 25 C (68 F and 77 F). The medication must be kept in its original packaging to ensure protection from moisture and light, which helps maintain the product's stability until the expiration date. It is strictly mandated to avoid freezing the product and to protect it from excessive heat above 30 C. Following these handling rules is essential to preserve the drug's quality.

Disposal and Child Protection

To dispose of unused or expired Aradois H, the official guidance prioritizes a drug take-back program or mail-back option when readily available. If these are not accessible, household disposal must follow the regulatory steps of mixing the medicine with an undesirable substance (like coffee grounds or kitty litter), placing the mixture in a sealed container, and discarding it in the trash. As a mandatory safety protocol, the medicine must always be stored out of the sight and reach of children.

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

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