Parten

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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 Parten

What is Parten?

Parten is a pharmaceutical preparation containing feverfew (Tanacetum parthenium), a medicinal herb from the Asteraceae family. It is primarily utilized in the context of migraine management, specifically for the purpose of reducing the frequency of migraine attacks.

Composition and Mechanism

The primary active constituent of Parten is parthenolide, a sesquiterpene lactone found in the leaves of the feverfew plant. Research suggests that this compound may influence several physiological pathways involved in migraines, including:

  • Inhibition of Inflammatory Substances: Parthenolide may help reduce the release of specific chemicals that contribute to blood vessel inflammation.
  • Serotonin Regulation: It is thought to assist in stabilizing the release of serotonin from platelets, which is often irregular during a migraine event.
  • Vascular Tone: The components of feverfew may help prevent the excessive constriction and subsequent dilation of blood vessels in the brain.

Therapeutic Intent

Parten is intended for prophylactic use, meaning it is taken consistently to prevent the onset of symptoms rather than to treat an acute migraine attack already in progress. It is categorized as a herbal medicinal product for the prevention of chronic or recurrent migraine headaches.

Because the effects of feverfew build up in the system gradually, it is typically used as a long-term approach to help decrease the total number of migraine days experienced by an individual. It serves as an alternative or adjunct option for those seeking plant-based constituents within their broader management plan.

Regulatory References

  1. Losartan: MedlinePlus Drug Information
  2. Losartan - StatPearls - NCBI Bookshelf

What side effects are possible with Parten?

Possible side effects and safety information for Parten (Losartan Potassium)

The official safety profile of Losartan Potassium is documented by government regulatory agencies and includes adverse reactions classified by frequency and affected organ system.

Classification Examples of Documented Reactions System-Organ Class Focus
Common Dizziness, upper respiratory infection, back pain, hyperkalemia (high blood potassium) Nervous System, Respiratory, Musculoskeletal, Metabolism
Uncommon Symptomatic hypotension (low blood pressure), rash, pruritus (itching) Vascular, Skin and Subcutaneous Tissue
Rare Angioedema (severe swelling of the face/throat), Anaphylaxis (severe allergic reaction) Immune System, Skin

Serious adverse reactions are explicitly highlighted in regulatory texts.

  • Fetal Toxicity: Losartan is contraindicated in the second and third trimesters of pregnancy due to the risk of injury and death to the developing fetus, a constraint highlighted by a formal Boxed Warning in the FDA prescribing information.
  • Severe Hypotension: The potential for symptomatic low blood pressure is noted as more common upon the initiation of treatment, particularly in patients who are volume- or salt-depleted.
  • Renal Function: The regulatory documentation states that changes in kidney function, including acute renal failure, may occur, particularly in susceptible patients.

Safety Constraints for Specific Populations

The official labeling mandates specific safety constraints for certain patient groups:

  • Hepatic Impairment: A lower starting dose is recommended for individuals with mild-to-moderate liver impairment due to increased drug concentrations in this population.
  • Co-administration: Losartan is contraindicated for co-administration with aliskiren in patients diagnosed with diabetes or moderate-to-severe renal impairment.
  • Hyperkalemia Monitoring: Periodic monitoring of serum potassium levels is required due to the risk of hyperkalemia, a common side effect of this medication class.

The regulatory safety structure for Parten focuses on communicating the likelihood of common effects while clearly defining the critical risks of fetal harm, severe allergic reactions, and the need for metabolic and renal function monitoring.

Overdose and Emergency Response

Overdose and when to seek help

The official regulatory documentation classifies an overdose of Parten (Losartan Potassium) as a severe hemodynamic event, driven by the drug's exaggerated pharmacological effect on blood pressure. This severe manifestation requires immediate professional attention.

Overdose Profile Official Regulatory Statements
Documented Manifestations Clinical signs of overdose include severe hypotension (low blood pressure), potential changes in heart rate such as tachycardia (fast heart rate), and in documented cases, bradycardia (slow heart rate, potentially due to vagal stimulation). The primary serious outcome is profound hypotension.
Management Protocol Treatment is strictly limited to symptomatic and supportive treatment. Official labeling confirms that no specific antidote is known for Losartan, and the drug is not dialyzable.
Population Note Infants with a history of in-utero exposure to this drug class require close monitoring for conditions like hypotension and associated renal or electrolyte imbalances.

When to Seek Immediate Medical Help:

Regulatory authorities mandate that any individual must seek emergency medical attention right away for a suspected overdose. Contacting emergency services is required if the affected person shows signs of severe instability, including collapse, trouble breathing, or inability to be awakened. This urgent action ensures that close observation and supportive management can be instituted promptly until the patient is clinically stable.

Therapeutic Uses of Parten

Quick Facts: Parten

  • Primary Use: Supports the management of high blood pressure (hypertension).
  • Secondary Use: May help maintain kidney health in individuals with type 2 diabetes and protein in the urine (proteinuria).
  • Additional Role: Supports heart function in managing heart failure.

Parten is an established treatment option used to support the management of high blood pressure, also known as hypertension. Maintaining blood pressure at supported goals is an important aspect of reducing the potential for future cardiovascular events.

For individuals diagnosed with type 2 diabetes who also present with proteinuria, Parten may be utilized to help support kidney function and may contribute toward achieving better overall health outcomes. Furthermore, this medication is used in helping to manage heart failure by supporting improved heart performance. Parten may be prescribed alone or in combination with other prescribed treatments as part of a comprehensive therapeutic plan. This medication is available as a treatment option for these conditions.

Eligibility and Restrictions for Use

Parten (Losartan Potassium) eligibility is strictly defined by regulatory authorities based on patient population characteristics.

Absolute Contraindications

Use is contraindicated in several specific populations. These include women in the second and third trimesters of pregnancy and patients with known severe hepatic impairment or hypersensitivity to the drug. The medicine is also contraindicated if co-administered with aliskiren in patients who have diabetes mellitus or existing renal impairment (GFR lt 60 mL/min/1.73 m^2).

Age and Restricted Use

Parten is approved for adults for all labeled uses. For pediatric patients, use is only approved for hypertension in children aged 6 years and older but is not recommended for those younger than 6 years old. Use is also not recommended for pediatric patients with a GFR lt 30 mL/min/1.73 m^2, or in patients with Primary Hyperaldosteronism. Women in the first trimester of pregnancy and those who are breastfeeding are also groups for whom use is not recommended.

Condition-Based Limitations

Restricted Use applies to patients with mild-to-moderate hepatic impairment or intravascular volume depletion, for whom the regulatory label advises special consideration, often involving a lower starting dose. There is no therapeutic experience documented for use in patients who have recently had a kidney transplant.

What should I know about interactions with other medicines?

The interaction profile for Parten (Losartan Potassium) is defined by pharmacokinetic (PK) and pharmacodynamic (PD) mechanisms as documented in official regulatory sources. Factual statements are derived strictly from government labeling for the purposes of patient information.

Category Interacting Substance/Class Official Interaction Statement
Contraindicated Combination Aliskiren Contraindicated in patients with diabetes or moderate-to-severe renal impairment due to increased risks of hyperkalemia and renal function deterioration.
Pharmacodynamic Risk Agents Increasing Serum Potassium Co-administration with potassium-sparing diuretics, potassium supplements, or potassium-containing salt substitutes may result in an increased risk of hyperkalemia.
Pharmacodynamic Risk Non-Steroidal Anti-Inflammatory Drugs (NSAIDs) NSAIDs, including COX-2 inhibitors, may reduce the antihypertensive effect of Parten and increase the risk of renal impairment, especially in elderly or volume-depleted patients.
Clearance Reduction Lithium Parten may reduce the renal clearance of lithium, which can lead to elevated serum lithium concentrations and the potential for toxicity.
Pharmacokinetic Alteration Fluconazole As a CYP2C9 inhibitor, Fluconazole significantly increases the plasma exposure (AUC) of losartan while simultaneously decreasing the AUC of the active metabolite.

The most significant regulatory restriction is the Dual Blockade of the Renin-Angiotensin System (RAS), which generally restricts combining Parten with ACE inhibitors or Aliskiren. The documented pharmacokinetic interactions (e.g., with Rifampin and Fluconazole) define specific changes in drug plasma levels (AUC) that must be factored into the overall use of the product. The official information highlights the necessity of monitoring blood parameters, particularly potassium and renal function, when combining Parten with agents known to affect these systems.

Mechanism of Action

How Parten Works — Mechanism of Action

Parten primarily functions as a reversible, non-selective antagonist on both the mathbfalpha1 and mathbfalpha2 adrenergic receptors within the sympathetic nervous system (SNS). This mechanism blocks the ability of endogenous catecholamines, such as norepinephrine, to activate these receptors, thereby preventing their normal function of driving smooth muscle contraction and peripheral resistance.

The blockade of alpha1-receptors on vascular smooth muscle interrupts the signaling cascade that typically leads to vasoconstriction (blood vessel narrowing). This action initiates peripheral vasodilation (widening of blood vessels), which reduces systemic vascular resistance and results in a corresponding decrease in peripheral pressure.

Simultaneously, the drug's non-selective action on presynaptic alpha2 receptors removes an inhibitory feedback signal, which can lead to increased local norepinephrine release. This disinhibition, combined with the baroreceptor reflex triggered by vasodilation, initiates a compensatory response that often results in tachycardia (increased heart rate) and increased cardiac output.

Dosage and Administration Information

Parten (Losartan Potassium) is an oral medication with specific dosing and administration guidelines.

Administration Protocol

Parten is for oral administration, available as film-coated tablets (25 mg, 50 mg, and 100 mg strengths). An oral suspension (2.5 mg/mL) can also be prepared from the tablets for patients who require it.

The medicine is generally taken once daily and may be administered with or without food.

Standard Dosing Regimens

For most adult indications, the typical starting dose is 50 mg once daily. The dosage can be increased up to a maximum of 100 mg once daily, based on individual response. The full blood pressure effect is typically reached within 3 to 6 weeks after starting or adjusting the dose.

Population Group Required Initial Dose (Oral) Dosing Frequency/Adjustment
Adults (General) 50 mg Once daily; max 100 mg/day
Hepatic Impairment (Mild-to-Moderate) & Volume-Depleted Patients 25 mg Once daily; a lower starting dose is required
Pediatric (≥ 6 years) 0.7 mg/kg (up to 50 mg total) Once daily; max dose ≤ 100 mg/day

Specific Use Instructions

In the event of a missed dose, the standard procedure is to take the dose as soon as it is remembered, unless it is close to the time for the next scheduled dose. In such cases, the missed dose is skipped to avoid doubling the daily amount. For higher daily doses, the maximum 100 mg dose may be administered as a single dose or in two divided daily doses. No initial dosage adjustment is typically required based on older age or renal impairment.

Recent Clinical Evidence

Research evidence / Overview of Studies for Parten


Evidence for use in Managing High Blood Pressure (Hypertension)

Research exploring Parten for high blood pressure involves short-term and long-term Randomized Controlled Trials (RCTs). These short-term studies were conducted to measure changes in systolic and diastolic blood pressure in adults with essential hypertension. Longer-term research was conducted in studies that monitored events related to cardiovascular health over periods of several years, including stroke and heart attack.

Many of the long-term studies that reported these patterns involved taking Parten in combination with other blood pressure medications. This research provides context regarding group patterns within a therapeutic approach, but the contribution of Parten as a single agent for these long-term outcomes is not fully established by these combination studies.


Evidence for use in Reducing Stroke Risk in Patients with Left Ventricular Hypertrophy

A large-scale, long-term randomized trial explored the effects of Parten in patients diagnosed with both high blood pressure and Left Ventricular Hypertrophy (LVH). The research focused on tracking the occurrence of major cardiovascular events, including stroke, over nearly five years of follow-up. Findings reported patterns observed in the studies related to the occurrence of stroke in the observed populations.


Evidence for use in Kidney Protection in Type 2 Diabetes

Research has explored the use of Parten in clinical situations involving kidney changes (diabetic nephropathy) in people with Type 2 Diabetes who also have proteinuria. The studies examined outcomes reflecting changes in organ function by tracking a composite renal endpoint, a combined measure of events reflecting kidney disease progression.


What is Still Uncertain About Parten's Research Profile

The research highlights what is known and what is still uncertain about Parten's evidence landscape. For example, data for certain groups (e.g., those with Type 1 Diabetes) remain insufficient because these populations were often excluded from the primary trials. Long-term data on outcomes are still emerging for younger pediatric patients (under 6 years of age). The results apply only to the populations studied and do not determine whether an individual will respond similarly.

Frequently Asked Questions (FAQ)

Common questions about Parten (FAQ)

Q: Is Parten the brand name or the generic name for this medication?

Parten is a name used for the medication whose generic name is Losartan Potassium. The official product information often lists the generic name, which is the chemical component responsible for the therapeutic effect. In many regions, the brand name for this active ingredient is COZAAR, as cited in regulatory documents.

Q: Does Parten contain any inactive ingredients that are common allergens?

Regulatory documents list the full range of ingredients, including inactive components like lactose, starches, and colorants. These substances are necessary for the tablet form but are substances that may be allergens for some individuals. Official product information contains a complete list for reference.

Q: Is Parten designed to cure the condition or only manage the symptoms over time?

The official product information indicates that Parten is used for the management of chronic (long-term) conditions such as high blood pressure. There is no information in the regulatory documents stating that it is a cure for these conditions. It is generally intended to be used for the management of chronic conditions.

Q: Are the side effects of Parten more common when first starting the treatment?

Official safety documents indicate that some effects, such as a drop in blood pressure (hypotension) and dizziness, may be more likely to occur when treatment is first started. This is why official instructions often advise caution during the initial phase of use. The specific safety information for the product provides a complete reference.

Q: Does Parten affect sleep quality or cause insomnia?

Yes, official regulatory documents list effects on sleep as possible adverse reactions. Insomnia (difficulty sleeping) is reported as a common side effect. Other sleep disorders may also be reported, according to the official safety profile.

Q: Is it safe to consume alcohol in moderation while undergoing Parten treatment?

Regulatory information notes that alcohol may increase the blood-pressure-lowering effect of Parten. This additive effect can increase the possibility of experiencing dizziness or fainting. Regulatory sources recommend discussing any consumption of alcohol with a healthcare provider.

Q: Are there any specific foods or beverages that must be avoided when taking Parten?

Official labeling advises patients to avoid potassium-containing salt substitutes or supplements due to the risk of high blood potassium (hyperkalemia). Furthermore, some regulatory information advises caution with grapefruit or grapefruit juice, as it may affect the drug's intended action.

Q: Is there a known interaction between Parten and grapefruit or grapefruit juice?

Yes, some regulatory sources indicate a potential interaction. Grapefruit or grapefruit juice may impact how the active ingredient Losartan is processed by the body, which can reduce the effectiveness of the drug's active component. Patients should refer to the full interaction section of the official label.

Q: Does Parten affect the effectiveness of hormonal birth control?

Specific, negative interactions between Parten and hormonal birth control are not commonly listed in the primary regulatory interaction sections. The official classification indicates that the drug's mechanism does not typically interfere with the hormone receptors involved in regulating the cardiovascular system. However, any concerns should be discussed with a healthcare professional.

Q: What is the typical duration of action for a single dose of Parten?

The drug is typically prescribed for once-daily administration to provide continuous, 24-hour coverage. Regulatory studies show that the primary active substance reaches its highest concentration in the blood about three to four hours after a dose. The drug’s metabolism supports its single-daily dosing schedule.

Q: Is it safe to stop taking Parten as soon as symptoms improve?

Official regulatory information notes that patients should not abruptly stop this medication, as it is a treatment for chronic health conditions. Discontinuation without a healthcare provider's direction may lead to health risks. Consistent use as prescribed is necessary for the intended therapeutic effect.

Q: Are there any gender-specific or sex-specific concerns associated with taking Parten?

The primary sex-specific concern highlighted in official regulatory documents is the Boxed Warning regarding fetal harm. Parten is contraindicated (should not be used) in women during the second and third trimesters of pregnancy due to the risk of injury and death to the developing fetus.

Q: Are there ongoing research studies or clinical trials investigating new potential uses for Parten?

Yes, ongoing research into the use of Losartan Potassium is consistently recorded on government-managed platforms such as ClinicalTrials.gov. These studies investigate potential therapeutic uses beyond its current regulatory indications, such as in conditions affecting the aorta or certain connective tissue disorders.

Q: What should be known about the inactive ingredients used in the formulation of Parten tablets or capsules?

The full list of inactive ingredients, including substances like lactose, microcrystalline cellulose, and magnesium stearate, is officially detailed in the regulatory description section of the product labeling. These components are necessary for the physical structure of the tablet but do not contribute to the medical effect.

Q: What is Parten used for besides the main condition listed on the official documents?

In addition to its use in treating general high blood pressure, Parten has other official indications. These include reducing the risk of stroke in patients who also have Left Ventricular Hypertrophy (LVH). It is also approved for kidney protection in patients with Type 2 Diabetes who have specific markers of kidney changes.

Q: Is Parten considered a long-term maintenance drug or a short-term treatment?

Official studies and regulatory information define Parten as a long-term maintenance treatment. It is designed for continuous use to manage chronic conditions. Clinical studies have successfully demonstrated its sustained therapeutic effect over periods lasting several years.

Q: How is Parten generally described as being different from other similar medicines?

Parten belongs to the Angiotensin II Receptor Blocker (ARB) class. Unlike some other blood pressure drugs, ARBs work by blocking a specific receptor rather than preventing a hormone from being created. Regulatory information suggests this difference in mechanism may lead to better patient tolerance, such as a potentially lower rate of cough.

Q: Is feeling tired or drowsy a known effect of taking Parten?

Yes, official safety documents indicate that feelings of tiredness or drowsiness may occur. Fatigue is a commonly reported side effect, and drowsiness (somnolence) is listed as an uncommon adverse reaction. Patients should be aware of these possibilities when starting treatment.

Q: What are the signs of a possible allergic reaction to Parten?

Regulatory information lists severe allergic reactions as a rare but serious risk. Key signs to watch for include angioedema, which is rapid swelling of the face, lips, throat, or tongue, and anaphylaxis. These are generally described as requiring prompt medical attention.

Q: Are there any known long-term safety concerns or effects with using Parten?

Official regulatory information emphasizes that patients on long-term treatment require periodic monitoring of blood parameters. The long-term safety priority is maintaining optimal levels of serum potassium and ensuring stable kidney function. These requirements are standard for this class of medication.

Q: Do the side effects of Parten vary a lot between different individuals?

While clinical trials establish general expectations, official documents state that study results apply only to the populations studied and do not determine how an individual patient will respond. This is consistent with the understanding that both therapeutic effects and side effects can naturally vary widely from person to person.

Q: What signs or symptoms should a patient watch for while taking Parten?

Official warnings and safety information highlight several important signs to monitor. These include symptoms of a severe allergic reaction (such as swelling), signs of very low blood pressure (like severe dizziness or fainting), and symptoms that could indicate high potassium levels (such as muscle weakness or an irregular heartbeat). These are generally described as requiring prompt medical attention.

Q: Can I take common over-the-counter pain relievers like acetaminophen or ibuprofen with Parten?

Regulatory documents indicate a potential interaction with Non-Steroidal Anti-Inflammatory Drugs (NSAIDs), such as ibuprofen. Taking an NSAID may reduce the effectiveness of Parten and increase the risk of kidney function issues in some individuals. Acetaminophen is generally not listed as a known interaction risk in major regulatory documents.

Q: Does Parten interact with common vitamins or herbal supplements like St. John's Wort?

The most significant interaction noted in regulatory information is with potassium-containing supplements or salt substitutes. While general vitamins are not usually listed, official documents advise reviewing all supplements, including herbal products, due to potential effects on drug metabolism.

Q: Will Parten continue to maintain its effectiveness over a long period, such as several years?

Yes, official research supports the sustained effectiveness of Parten for long-term use. The medication has been studied in randomized controlled trials lasting several years to confirm its continued therapeutic benefit in the management of chronic conditions.

Q: What safety precautions should be considered if taking Parten while driving or operating heavy machinery?

Official regulatory labeling advises caution when driving vehicles or operating heavy machinery. This warning is especially relevant when first starting the treatment or increasing the dose, as effects like dizziness or drowsiness may impact driving or operating machinery.

Q: Why did the clinical trials for Parten focus on a specific age range or population group?

Clinical trials focused on populations where the drug was expected to show the clearest benefit and safety profile. Regulatory information notes that certain groups, such as very young pediatric patients or those with Type 1 Diabetes, were often excluded from the primary trials. This indicates that data remains limited or insufficient for these specific groups.

How should Parten be stored and disposed of?

Parten (Losartan Potassium) tablets must be stored at Controlled Room Temperature, typically 20 C to 25 C (68 F to 77 F). The container must be kept tightly closed and stored away from excess heat, light, and moisture. This protection is essential to maintain the product's stability. All medication must be kept out of the sight and reach of children.

For disposal of unused or expired tablets, the preferred method is a community drug take-back program. If a take-back option is unavailable, the medicine can be mixed with an undesirable substance (such as dirt), placed in a sealed container, and thrown into the household trash. The tablets must not be flushed down the toilet.

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

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