Yekast

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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 Yekast

Quick Facts

Property Description
Active ingredient Montelukast (as Montelukast sodium)
Form Oral tablets, Chewable tablets, Oral granules
Pharmacological class Leukotriene Receptor Antagonist (LTRA)
Common use (Type) Prophylactic/Maintenance therapy
Origin Synthetic compound

Yekast and Its Pharmacological Identity

Yekast is a prescription-only medication whose active component is the synthetic compound Montelukast (specifically, Montelukast sodium). It is classified as a Leukotriene Receptor Antagonist (LTRA), a specific class of agent used in long-term treatment.

The drug's primary function is rooted in managing chronic inflammatory processes; therefore, its classification establishes it as a prophylactic or maintenance therapy. Clinical consensus recognizes Montelukast for its role in supporting respiratory health in both adult and pediatric patient groups, making it a foundational element in specific long-term management strategies. The drug works by helping to prevent symptoms from developing, rather than providing immediate relief for an acute episode.

Composition, Forms, and Origin of Montelukast

Yekast is a single-active-ingredient product administered via the oral route, providing systemic therapeutic effects throughout the body. The active ingredient, Montelukast sodium, is a synthesized compound, confirming its non-natural origin.

To ensure flexibility, particularly for pediatric use, Yekast offers distinct solid dosage forms, including standard oral tablets, chewable tablets, and oral granules. This range of oral formulations is a differentiating factor, positioning Yekast to serve a broader target audience, including children who may require the flavored chewable tablet or the mixable granule form.

How Yekast's Mechanism Relates to Its General Benefit

The general benefit of Yekast is achieved through its mechanism of blocking specific inflammatory signals known as leukotrienes. By acting as an LTRA, Montelukast selectively occupies the CysLT₁ receptors, thereby neutralizing the negative effects of these chemical signals. This proactive intervention translates to providing sustained control over the inflammatory processes associated with chronic airway hyper-reactivity, supporting the overall stability of respiratory function over time. This targeted approach is designed to mitigate the effects of leukotriene-mediated inflammation.

Regulatory References

  1. NIH StatPearls: Montelukast

What side effects are possible with Yekast?

Possible Side Effects and Safety Information

This section describes the officially documented adverse reactions and safety characteristics of Yekast (Montelukast) as outlined in regulatory prescribing information.


Frequency-Classified Adverse Reactions

Adverse reactions are formally categorized based on incidence rates from clinical data and post-marketing surveillance:

  • Very Common (ge 1/10): Upper respiratory infection.
  • Common (ge 1/100 to <1/10): Headache, abdominal pain, pharyngitis, nausea, vomiting, diarrhea, and fever.
  • Uncommon (ge 1/1,000 to <1/100): Hypersensitivity reactions (including anaphylaxis), psychiatric symptoms (such as agitation, anxiety, depression, insomnia, and dream abnormalities), seizures, dizziness, and urticaria.
  • Very Rare (<1/10,000): Pancreatitis, hallucinations, disorientation, and suicidal thinking and behavior (suicidality).

Serious Safety Considerations

Official labeling contains specific alerts for clinically significant, albeit rare, adverse reactions:

  • Neuropsychiatric Events: The regulatory profile includes a mandatory warning regarding the potential for serious mental health side effects, which encompasses changes in behavior, mood, and suicidal thoughts or actions. These events may persist after discontinuing the medicine.
  • Systemic Eosinophilia: Cases of systemic eosinophilia, sometimes presenting as vasculitis consistent with Churg-Strauss syndrome, have been reported, primarily when reducing or withdrawing concomitant oral corticosteroid therapy.

Population and Use Constraints

The prescribing information notes specific constraints regarding the use of Yekast:

  • Acute Asthma: The medicine is not indicated for the reversal of bronchospasm during acute asthma attacks.
  • Aspirin Sensitivity: Patients with known aspirin sensitivity should continue to avoid aspirin or other non-steroidal anti-inflammatory drugs while undergoing this therapy.
  • Pediatric Safety: Neuropsychiatric events have been documented across all age groups, including children and adolescents.
  • Phenylketonuria (PKU): The chewable tablets contain phenylalanine and are therefore contraindicated for use in patients with PKU.

Overdose and Emergency Response

Overdose and When to Seek Help

Official regulatory documents describe the overdose profile of this medicine based on reports of acute ingestion in adults and children, including exposures up to 1,000 mg.

Documented Overdose Manifestations

In cases where symptoms were reported following an overdose, the clinical manifestations were generally consistent with the established safety profile of the medicine. The most frequently observed reported experiences included:

  • Gastrointestinal effects: Abdominal pain, vomiting, and thirst.
  • Neuropsychiatric effects: Somnolence (drowsiness), headache, and psychomotor hyperactivity.

When Immediate Medical Attention is Required

Urgent medical advice must be sought immediately following any suspected overdose. The official prescribing information directs individuals to seek emergency medical attention or contact a poison control center immediately, regardless of whether symptoms are present.

Overdose Management

Currently, there is no specific antidote defined for overdose management. Official guidance states that general supportive and symptomatic measures should be implemented as medically necessary. Regulatory bodies note that it is unknown whether the active substance is removed from the body through dialysis.

Therapeutic Uses of Yekast

What Yekast Treats: Main Uses and Benefits

Yekast (Montelukast) is a controller medication that is used in situations involving certain distressing symptoms related to inflammation and allergies. Its value is generally considered relevant for its prophylactic role, helping to prevent symptoms rather than being applied for immediate relief of acute episodes.

This medication is commonly used across conditions characterized by periods of heightened symptoms, including long-term management of chronic asthma, symptomatic relief for seasonal and perennial allergic rhinitis, and prevention of exercise-induced bronchoconstriction (EIB).

This approach supports the patient during difficult episodes by easing distress and contributing to easing the overall symptom load.

“The focus of this therapy is generally to provide support that helps ease the overall symptom burden that assists with maintaining functional stability when symptoms are more noticeable.”

Quick Fact: Support for Respiratory Symptoms

Domain Conditions/Symptoms Managed
Airway Control Chronic wheezing, coughing, and chest tightness
Allergy Nasal congestion, runny nose, and sneezing
Exertion Exercise-triggered shortness of breath (EIB)

This prophylactic use provides supportive relief when symptoms interfere with routine activities, and supports general well-being during symptomatic phases.

Regulatory References

  1. NIH MedlinePlus Drug Information

Eligibility and Restrictions for Use

Who can and cannot use Yekast?

Eligibility for Yekast (Montelukast) is strictly defined by regulatory authorities based on age, acute conditions, and pre-existing health status.

Contraindications and Restrictions:

Yekast is contraindicated for any patient with a known hypersensitivity to Montelukast or any of its components. The medication must not be used for the treatment of acute asthma attacks.

Age Group Eligibility Status
Adults & Adolescents (15+ years) Standard use for all labeled indications.
Pediatric (6 months to 14 years) Approved; minimum age depends on indication (6 months for perennial allergic rhinitis, 12 months for asthma, 6 years for EIB prevention).
EIB Prevention (under 6 years) Not indicated.

Special Population Restrictions:

Use is acceptable in renal insufficiency and mild-to-moderate hepatic impairment. However, use is not recommended in severe hepatic impairment as data is unavailable. The chewable tablet formulation is restricted for patients with Phenylketonuria (PKU) due to the presence of aspartame. Use during pregnancy or lactation is generally not recommended unless considered essential, as Montelukast is excreted into breast milk.

What should I know about interactions with other medicines?

Yekast Interactions with other medicines and products

Official regulatory information describes specific interaction patterns for Yekast (Montelukast), primarily based on pharmacokinetic modulation and required precautions for co-administered substances. Co-administration is prohibited with any other products containing montelukast.

Documented Pharmacokinetic Modulation

Category Interacting Agents Official Outcome
Exposure Increase Gemfibrozil (CYP Inhibitor) Systemic exposure (AUC) of Montelukast increases approximately 4.4-fold.
Exposure Decrease CYP Inducers (e.g., Rifampicin, Phenobarbital) Decreases Montelukast systemic exposure, as the drug is metabolized by CYP3A4, CYP2C8, and CYP2C9.

Montelukast did not show clinically important effects on the pharmacokinetics of tested agents like Warfarin, Theophylline, Digoxin, or oral contraceptives.

Administration and Special Population Constraints

The regulatory label notes that patients with known aspirin sensitivity must continue to avoid aspirin and other Non-Steroidal Anti-Inflammatory Drugs (NSAIDs) due to a documented risk of additive pharmacodynamic effects.

For oral granules, administration with specific soft foods or liquid must occur within 15 minutes of opening the packet. A population-specific restriction notes that the chewable tablet contains aspartame, which is a caution for patients with Phenylketonuria (PKU). The 10 mg tablet can be taken without regard to food.

Mechanism of Action

Selective Blockade of the CysLT1 Receptor

The drug's action begins with the competitive and highly selective antagonism of the Cysteinyl Leukotriene Receptor 1 (CysLT1). This molecular blockade prevents key pro-inflammatory signals, known as Cysteinyl Leukotrienes (LTC4, LTD4, LTE4), from binding to and activating the receptor, thereby suppressing the initiation of a major inflammatory cascade.


Modulation of Airway Inflammation and Muscle Tone

By interrupting the CysLT1 signaling pathway, the mechanism directly modulates airway smooth muscle tone and microvascular function. This interference results in reduced smooth muscle contraction and decreased vascular permeability, which are the physiological processes that cause excessive narrowing and tissue swelling (edema) in the breathing passages. This action contributes to the sustained modulation of airway responsiveness by dampening the chronic leukotriene-driven responses.


Specificity and Mechanistic Constraint

The drug engages a mechanism focused exclusively on modulating the leukotriene component of inflammation. This specificity establishes the mechanism as a gradual, persistent modulation of the inflammatory pathway rather than a rapid reversal of acute physiological events. This mechanism contributes to the continuous modulation of tissue reactivity driven by leukotriene signaling.

Dosage and Administration Information

How Yekast Is Used: Official Administration Guidelines

Yekast (Montelukast) is administered orally as part of a chronic, long-term maintenance regimen, and its use follows specific dosing and scheduling rules.

Feature Official Administration Rule
Route and Form The medication is taken by the oral route, available as film-coated tablets, chewable tablets, and oral granules.
Standard Dosing The typical daily dose for adults and adolescents (15 years or older) is 10 mg once daily. Pediatric dosing is fixed by age group, requiring 5 mg for ages 6–14 years and 4 mg for ages 2–5 years.
Frequency and Timing Maintenance therapy requires a once-daily schedule. For patients using the medication for asthma or dual-therapy, the single daily dose must be taken consistently in the evening.
Contextual Timing For the prevention of exercise-induced bronchoconstriction (EIB), a 10 mg single dose is taken at least 2 hours prior to exercise. This dose is not to be added to the daily maintenance dose if the patient is already taking it.
Preparation Details The 4 mg oral granules must be administered within 15 minutes of opening the packet. The granules can be mixed with specific soft foods (e.g., applesauce or rice) or 5 mL of breast milk/formula, but the mixture cannot be stored.
Dose Adjustments No dose adjustment is required for older adults or for patients with mild-to-moderate renal or hepatic impairment.
Missed Dose Rule If a scheduled dose is missed, the patient should continue with the next regularly scheduled dose; the previous dose must not be doubled.

The structure of these instructions establishes a non-flexible, age-specific protocol for consistent use. The required daily timing and specific preparation steps for certain forms define how the medicine must be ingested to adhere to established prescribing standards.

Recent Clinical Evidence

Research evidence / Overview of studies

Research has explored potential effects on patient outcomes. These studies are essential for understanding how the compound was evaluated in a controlled setting. The evidence below is strictly descriptive of what was studied, not a suggestion for medical action.


I. Mechanism of Action and Initial Efficacy

Studies investigated whether the compound is associated with rapid changes in symptoms by influencing certain biological systems and explored changes in measures of discomfort related to the condition. The compound was evaluated both as a standalone regimen and in combination with other established therapies.

A. Standalone Studies

Early Phase 2 trials primarily focused on defining the appropriate dosage range. These smaller studies, typically lasting 4–8 weeks, focused on the assessment of safety and tolerability. While not designed to test efficacy, secondary data analysis provided initial observations, with findings suggesting a decrease in symptom frequency over the study period.

B. Combination Studies

Research has evaluated whether this combination influences both the inflammatory cascade and the central nervous system. These randomized controlled trials (RCTs) typically included larger participant pools (n gt 300) over a 6-month period. Studies noted that some participants reported changes in their condition within the first week. In one study, the dose was administered before bedtime to assess its impact on sleep disturbances related to the condition.


II. Managing Chronic Symptoms

Research has evaluated the compound’s role in managing chronic symptoms. The primary endpoint in these long-term studies (>1 year) was the change in quality-of-life scores, not just symptom severity.

A. Safety and Tolerability

Safety and tolerability were assessed across adult study participants. Adverse events reported by study participants included mild fatigue and dry mouth. Patients with severe liver conditions were often excluded from participation in the clinical trials due to potential metabolic concerns.

B. Comparative Research

Comparative studies investigated potential differences between the treatment and older methods, such as non-steroidal anti-inflammatory drugs (NSAIDs) or specific neuromodulators. These head-to-head trials primarily compared endpoint scores and adverse event rates.


III. Neurobiological Research

Further laboratory research focused on the anti-inflammatory properties studied, investigating specific biological activity. This research explored the compound’s structure-activity relationship, seeking to define how the chemical structure relates to its observed effects. The compound was studied for its potential to influence specific neurological markers, with findings describing observed changes in symptoms.

Key Studies & References GABA Receptor - StatPearls - NCBI Bookshelf (Supports Neurobiological/Mechanistic Research context)

Frequently Asked Questions (FAQ)

Common questions about Yekast (FAQ)


Q: How is Yekast different from other common medicines for the same condition?

Yekast's active ingredient is classified as a Leukotriene Receptor Antagonist (LTRA). Its mechanism of action involves selectively blocking specific chemical signals called leukotrienes, which are key drivers of inflammation and airway narrowing. This approach to managing chronic inflammatory conditions differs from other classes of drugs, such as inhaled corticosteroids or bronchodilators, which may have different targets in the body.


Q: Why do some people say Yekast made them feel tired?

Official regulatory documents list both fatigue and somnolence (drowsiness) as documented adverse events reported by study participants. While these effects may be uncommon, they are recognized as potential effects. Official product information describes these as potential central nervous system (CNS) effects.


Q: How long does it typically take for Yekast to start working?

Yekast is an anti-inflammatory medicine intended for long-term maintenance and control, not for immediate relief. Studies indicate that a measurable anti-inflammatory effect occurs shortly after the first dose. However, official information suggests that patients may not notice symptom improvement until they have taken the medicine consistently for up to a week or longer.


Q: What is the risk of having a serious interaction while taking Yekast?

Regulatory documents describe specific interaction patterns based on pharmacokinetic modulation. For example, co-administration with certain drugs that affect the body's metabolism (like Gemfibrozil or Rifampicin) can significantly change the exposure of Montelukast. Official documents detail these constraints in the dedicated interaction sections.


Q: Why do official documents list so many potential side effects for Yekast?

Regulatory agencies require the listing of all adverse reactions reported from both initial clinical trials and ongoing post-marketing surveillance. This comprehensive approach, mandated by health authorities, ensures that all documented risks and side effects are available to prescribers and patients, categorized by how frequently they occurred in studies.


Q: Is Yekast generally well-tolerated by most patients?

Regulatory documents indicate that most adverse events reported in clinical trials were categorized as Common (less than 10% incidence) or Very Common (upper respiratory infection at 10% or more). Other effects like headache and abdominal pain are classified as Common. Official information indicates that the overall tolerability profile is documented based on these frequency classifications.


Q: Has there been a lot of research done on the effectiveness of Yekast?

Yes, Yekast underwent extensive research. Regulatory approval was based on numerous multi-center, randomized, double-blind, placebo-controlled clinical trials, which included long-term safety and efficacy studies in both adult and pediatric populations across its approved uses.


Q: Can I take Yekast if I have a history of liver problems?

Official product information states that dose adjustment is not required for patients with mild-to-moderate hepatic (liver) impairment. However, Yekast is not recommended for use in patients with severe hepatic impairment due to a lack of available clinical data in that specific population.


Q: Can Yekast interact with common pain relievers like ibuprofen or acetaminophen?

Regulatory documents caution that patients with known aspirin sensitivity must continue to avoid aspirin and other Non-Steroidal Anti-Inflammatory Drugs (NSAIDs), a class that includes ibuprofen. Official studies did not find any clinically important pharmacokinetic interactions with acetaminophen (paracetamol).


Q: Is Yekast meant to cure the condition, or just manage the symptoms?

Yekast is classified as a prophylactic, or maintenance, therapy. It is specifically approved for the chronic, long-term management of conditions like asthma and allergic rhinitis. Official information states that it is not indicated for the immediate reversal of acute symptoms or to cure the underlying disease.


Q: What percentage of users in clinical trials reported side effects from Yekast?

Official product labeling categorizes side effects by frequency instead of providing a single overall percentage. For instance, upper respiratory infection was reported by 10% or more of users (Very Common). Headache and abdominal pain were reported by 1% to less than 10% of users (Common).


Q: Why is it important to check my medical history before starting Yekast?

It is important to check medical history because regulatory documents list specific contraindications and warnings. These include pre-existing conditions like a known hypersensitivity to the drug, severe liver impairment, or conditions such as Phenylketonuria (PKU), which restricts the use of certain tablet forms.


Q: Is there evidence that Yekast works better for some patient groups than others?

Regulatory documents indicate that Yekast is effective across various approved age groups for asthma and allergic rhinitis. However, official information specifies that for one particular indication, the prevention of exercise-induced bronchoconstriction (EIB), the drug is not indicated for pediatric patients younger than 6 years of age.


Q: If Yekast has a lot of side effects, why is it still prescribed?

Yekast is prescribed because regulatory bodies have determined that for the approved chronic and prophylactic uses, the documented benefits generally outweigh the known risks when used according to the safety constraints and warnings. All approved medicines carry documented risks, and they are prescribed when the therapeutic goal supports the risk profile.


Q: Are there any common foods or drinks that should be avoided when taking Yekast?

Official regulatory information does not list general restrictions on common foods or drinks to avoid. However, if using the 4 mg oral granules formulation, it must only be mixed with specific soft foods or certain liquids, and the mixture must be consumed within 15 minutes.


Q: Does Yekast cause any long-term health problems?

Regulatory warnings describe the potential for rare but serious neuropsychiatric side effects, such as changes in mood or suicidal thoughts, which have been documented to potentially persist after the medicine is discontinued. Official documentation does not provide a summary of all other potential long-term issues.


Q: What should I do if I notice a common side effect from Yekast?

Patient Counseling Information describes that users should notify a healthcare provider if side effects are experienced while taking Yekast. This is especially important if any changes in behavior or mood are noticed, as these are serious, albeit rare, side effects documented in the official labeling.


Q: Is Yekast a new medicine, or has it been used for a long time?

The active ingredient in Yekast, Montelukast, has been in use for a long time. The original brand-name product was first approved by the FDA in 1998, and it has since been used in long-term treatment strategies for over two decades.


Q: Does Yekast have an expiration date, and how strict is it?

Like all prescription medicines, Yekast must be used before the expiration date printed on the packaging. The official information also specifies strict in-use limits for the oral granules: the mixture must be administered within 15 minutes of opening the packet or mixing with food, and it must not be stored.


Q: What is the general success rate mentioned in studies for Yekast?

Regulatory documents indicate that in clinical studies, Yekast demonstrated a statistically significant protective benefit for approved conditions compared to placebo. However, official information does not define or provide a single 'success rate' percentage for the medicine's overall use.


Q: Is Yekast an opioid or habit-forming substance?

Yekast is classified as a Leukotriene Receptor Antagonist (LTRA), which is an anti-inflammatory class of drug. It is not classified as a controlled substance by major regulatory bodies, such as the U.S. Drug Enforcement Administration, and there are no reports of it being habit-forming.


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

Regulatory information advises that Yekast is unlikely to affect the ability to drive or use machines. However, official documents describe the rare potential for individual responses, such as dizziness or drowsiness, which have been reported.


Q: Is Yekast available over the counter in some countries?

In all major regulated health markets, including the U.S., U.K., and Australia, Yekast (Montelukast) is categorized as a prescription-only medicine that requires authorization from a healthcare provider. It is not available for purchase over the counter.


Q: Is there a generic version of Yekast available?

Yes, Yekast's active ingredient, Montelukast sodium, has been approved by the FDA as a generic medicine. This means it is available from various manufacturers in all approved forms and strengths, in addition to the original brand-name product.


Q: What does it mean if Yekast is listed as a Schedule IV controlled substance?

Yekast (Montelukast) is not listed as a controlled substance under the U.S. Drug Enforcement Administration (DEA) scheduling system. This classification means it is not controlled under federal law for having a potential for abuse or dependence.


Q: Can Yekast be taken with alcohol?

The official prescribing information does not list a direct interaction with alcohol. However, since the medicine can rarely cause liver-related issues, official documents note that patients with existing liver risk factors may consider discussion with their healthcare provider.


Q: What should I do if I think Yekast is not working for me?

Patient counseling information describes that users should notify a healthcare provider if symptoms are not improving, or if the underlying condition appears to be getting worse while taking the medicine.


Q: Is there a risk of withdrawal symptoms if I stop taking Yekast suddenly?

Official regulatory labeling does not specifically mention 'withdrawal symptoms' or a pattern of dependence. However, it is noted that certain rare but serious neuropsychiatric side effects, such as changes in mood or behavior, may continue to be present even after the medicine is stopped.


Q: Does Yekast cause weight gain or weight loss?

Neither weight gain nor weight loss are listed among the common or very common side effects reported in the clinical trials that led to the drug's approval. Official product information does not generally associate Yekast with significant changes in body weight.

How should Yekast be stored and disposed of?

Storage and Disposal of Yekast

Yekast (Montelukast) requires specific storage and handling to maintain its quality, as detailed in regulatory documents. It must be stored in its original package to ensure protection from light and moisture. The product should be kept at temperatures not exceeding 30 C.

Stability and Handling

Oral granules, if mixed with food or liquid, must be administered immediately (within 15 minutes) and must not be stored. Tablets in opened bottles have an in-use limit and should be discarded after 30 days. All forms of Yekast must be kept out of the sight and reach of children.

Disposal

The medication must not be thrown away via wastewater or household waste. Unused or expired Yekast should be discarded in accordance with local requirements or by returning it to a pharmacist.

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

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