Delesit

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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 Delesit

What is Delesit? (Desloratadine)

Property Description
Active ingredient Desloratadine (INN)
Form Tablet, film-coated tablet, oral solution/syrup
Pharmacological class Second-Generation Antihistamine
Common use Systemic anti-allergic relief
Origin Synthetic (active metabolite of Loratadine)

The Identity and Classification of Delesit

Delesit is a single-ingredient pharmaceutical preparation whose therapeutic activity is provided solely by the active substance, Desloratadine. This synthetic compound is classified as a second-generation antihistamine, which is an evolution from older, sedating formulas. Desloratadine is structurally unique as the principal active metabolite of the precursor drug, loratadine. Pharmacological studies confirm it functions as a potent and selective peripheral H1-receptor antagonist, a mechanism designed to offer effective relief while specifically minimizing the adverse effect of sedation associated with earlier agents.

Composition and Available Forms of Delesit

The product is a single-entity medicine intended for oral administration, containing only Desloratadine as the functional component. Delesit is commonly manufactured in multiple dosage forms, which include film-coated tablets and liquid preparations such as an oral solution or syrup. The liquid forms, in particular, provide a crucial option for administering the drug to various patient groups, including children, by integrating the active substance into a palatable aqueous vehicle base. The formulation is consistently designed for long-acting systemic action.

High-Level Purpose of Desloratadine

The general purpose of the medicine is to provide continuous, predictable relief by directly managing the body’s allergic response. Desloratadine achieves this by preventing histamine, the key inflammatory mediator, from binding to the H1 receptors on cells, thereby suppressing the systemic allergic cascade. This physiological action leads to sustained anti-allergic effects and delivers dependable symptom control over a full 24-hour period following a single dose.

What side effects are possible with Delesit?

The safety profile of Delesit (Desloratadine) is established through regulatory data, with potential adverse reactions classified by frequency and affected body system. This classification is the official framework used by government authorities to communicate risk.

System-Organ Classes and Frequency of Adverse Reactions

The most frequently reported adverse reactions documented in official sources are classified as Common, affecting up to 1 in 10 people. These effects involve the Nervous System (e.g., headache), Gastrointestinal Disorders (e.g., dry mouth), and General disorders (e.g., fatigue).

Reactions classified as Very Rare (less than 1 in 10,000 people) span multiple System-Organ Classes, including Psychiatric Disorders (hallucinations), Cardiac Disorders (tachycardia, palpitations), and Hepatobiliary Disorders (hepatitis, increased liver enzymes). Other effects are classified as Not Known (frequency cannot be estimated), such as QT prolongation (a heart rhythm change) and weight gain.

Documented Serious Adverse Reactions and Safety Notes

The regulatory labels identify Hypersensitivity Reactions as a category containing serious adverse reactions, which are classified as very rare. These may include anaphylaxis and angioedema (swelling). Other serious events listed in official labeling include convulsions and hepatitis.

Specific Population-Specific Safety Considerations are documented. Drug exposure may be increased in patients with severe renal or hepatic impairment. In the pediatric population (6 to 11 months), reactions such as diarrhea, fever, and insomnia have been documented as common. The official documents also note that the drug does not potentiate the performance-impairing effects of alcohol.

This structure ensures a clear understanding of officially documented risks, from common discomforts to rare, serious events, without providing clinical advice or treatment recommendations.

Overdose and Emergency Response

Overdose and When to Seek Help

Official regulatory documents define the overdose profile for Delesit (Desloratadine) by focusing on documented manifestations and mandated emergency actions.

Documented Overdose Presentations

The adverse event profile associated with an overdose is similar to that observed at therapeutic doses, though the magnitude of effects can be higher. The officially documented presentation includes somnolence (drowsiness). Severe manifestations reported in safety profiles include effects on the Cardiovascular System (e.g., tachycardia, palpitations, QT prolongation) and the Central Nervous System (e.g., seizures).

Required Emergency Actions

In the event of a suspected overdose, symptomatic and supportive treatment is recommended according to the prescribing information. Regulators also advise considering standard measures to remove unabsorbed active substance, such as gastric decontamination. If severe symptoms occur, such as collapse, seizure, trouble breathing, or inability to be awakened, immediate medical attention or emergency services must be contacted.

Antidote and Elimination

No specific antidote is known for Desloratadine. The official management notes that the active substance is not eliminated by haemodialysis.

Therapeutic Uses of Delesit

Delesit is commonly used to help with symptoms of increased neurological or muscular activity, which include intense burning, shooting, or shock-like sensations related to nerve discomfort. It is applied across domains where additional symptomatic support is needed for relief from these pain patterns. Delesit is considered relevant for patients experiencing: symptoms related to physical discomfort, associated emotional strain, and functional instability during symptomatic episodes. The medication assists with maintaining functional stability when symptoms create noticeable physiological strain.


This medication supports the patient during difficult episodes by easing distress and contributes to improved comfort during symptomatic periods, in contexts marked by increased discomfort or tension. It is often used during phases when symptoms become more noticeable and supportive relief is needed. Delesit may assist with managing symptoms that interfere with daily comfort.

Quick Fact: Focus on Persistent Nerve Discomfort Delesit is applicable in conditions involving episodic or fluctuating manifestations and provides support that helps ease the overall symptom burden when symptoms interfere with routine activities.

Regulatory References

  1. Lyrica | European Medicines Agency (EMA) overview

Eligibility and Restrictions for Use

Who can and cannot use Delesit? (Desloratadine)

The eligibility for Delesit is defined by official government regulatory agencies (e.g., EMA, FDA) based on patient population, age, and pre-existing conditions.


Contraindications and Absolute Non-Eligibility

The medicine is contraindicated and must not be used by patients with a known hypersensitivity to the active substance, desloratadine, its precursor, loratadine, or any inactive ingredients (excipients) in the formulation.

Populations with Restrictions and Limitations

Population/Condition Regulatory Status
Infants under 6 months Not recommended (Safety/efficacy not established).
Pregnancy/Lactation Not recommended (Precautionary measure; excreted in breast milk).
Severe Renal/Hepatic Impairment Use requires caution and conditional management.
Seizure History Use requires caution due to increased susceptibility risk.

Approved Age Groups

The use of Delesit is formally established for adults and adolescents (ge 12 years). Use is also established for children, with the minimum eligible age ranging from 6 months to 1 year, depending on the specific product formulation (e.g., oral solution) and regional label.

What should I know about interactions with other medicines?

Interactions with other medicines and products

This section details the officially documented interaction patterns of Delesit (Desloratadine) as defined by government regulatory agencies.

Category Officially Documented Information
Exposure-Modifying Medicines Ketoconazole, Erythromycin, Azithromycin, Fluoxetine, and Cimetidine (CYP3A4 inhibitors).
Pharmacodynamic Interaction Alcohol (Ethanol).
Food/Beverage Status Food and Grapefruit juice are documented to not affect bioavailability.

The most common interactions involve co-administration with inhibitors of the Cytochrome P450 3A4 (CYP3A4) pathway. Co-administration with agents such as Ketoconazole and Erythromycin officially results in an increased systemic exposure (Cmax and AUC) of Desloratadine and its metabolite. However, the regulatory conclusion from clinical trials states that these documented changes in exposure were not associated with clinically relevant safety profile alterations.

Regarding pharmacodynamic effects, regulatory studies indicate that Delesit co-administered with alcohol does not potentiate the performance-impairing effects of ethanol. Nonetheless, post-marketing surveillance reports include cases of alcohol intolerance and intoxication, leading to caution.

Patients with Severe Renal Impairment or Hepatic Impairment have documented slower clearance and increased baseline systemic exposure of Desloratadine. This population-specific factor may amplify the potential impact of concurrent drug interactions. Contraindication to Delesit is limited to known hypersensitivity to the active substance or its precursor, Loratadine.

Mechanism of Action

Selective H1 Receptor Antagonism

Delesit acts by selectively binding to and blocking the histamine H1 receptors in peripheral tissues, which are key targets within the signaling pathway. The compound functions as an inverse agonist, stabilizing the receptor in an inactive conformation. This precise mechanism directly interrupts the molecular cascade initiated by endogenous histamine, preventing the subsequent release of intracellular calcium and the initiation of characteristic downstream cellular events.

Attenuation of Peripheral Physiological Responses

The drug's primary action is to influence signaling within the peripheral nervous and vascular systems. Due to its limited ability to cross the blood-brain barrier, Delesit is predominantly peripherally acting. By preventing histamine from activating its target receptors on endothelial cells and sensory nerve endings, this antagonism results in the core physiological consequences of modification of vascular permeability and attenuation of signaling at sensory nerve endings.

Dosage and Administration Information

How to Use Delesit (Desloratadine)

The administration of Delesit is by the oral route, following standardized dosage guidelines. As a long-acting second-generation antihistamine, the medicine is taken once daily across all approved age groups and dosage forms, reflecting its 24-hour action profile. The precise timing relative to meals is not a constraint, as the drug can be taken with or without food.

Standard Dosing Regimens

Dosing is based on age and remains consistent for most patients, as doses exceeding 5 mg per day do not provide increased clinical efficacy.

Age Group Standard Daily Oral Dose
Adults and Adolescents (12+ years) 5 mg once daily
Children (6 to 11 years) 2.5 mg once daily
Children (12 months to 5 years) 1.25 mg once daily (oral solution)
Infants (6 to 11 months) 1 mg once daily (oral solution)

Duration and Special Administration Rules

Treatment duration is flexible and defined by the patient's symptomatic needs. The pattern of use may be intermittent for short-lived episodes, where the drug is stopped upon symptom resolution and reinitiated upon recurrence, or it may be continuous throughout a defined exposure period.

For patients with severe renal or hepatic impairment, the standard regimen for adults is modified. The recommended starting dose in these specific populations is 5 mg every other day to account for altered drug clearance.

When using the oral solution, accurate dose delivery is mandatory, requiring the use of a calibrated measuring dropper or syringe. The orally-disintegrating tablets require a specific procedure: they must be placed on the tongue and allowed to dissolve rapidly before swallowing, and they must be taken immediately after removal from the blister packaging.

Recent Clinical Evidence

Research evidence / Overview of studies for Delesit

Evidence for use in Seasonal Allergies (Hay Fever)

Studies for Delesit have been conducted in people who experience seasonal allergic rhinitis, a condition characterized by fluctuating or episodic manifestations. These research efforts explored how symptoms change over defined time intervals, often during the expected pollen season. Research highlights changes measured in outcomes related to physical discomfort. For many participants, the findings describe patterns observed in outcomes related to physical discomfort over the short-term study periods. What remains uncertain is the full extent of the observed changes in certain individual symptoms or in real-world settings that involve varying symptom burdens.


Evidence for use in Chronic Hives

This part details the research that has evaluated Delesit in people with chronic idiopathic urticaria (CIU), a condition marked by functional limitations and symptoms that may vary in intensity. Research examined outcomes related to physical discomfort, such as the severity of itching and the number and size of hives. Findings indicate that studies report how symptoms evolved in the observed populations, with results describing patterns observed in outcomes capturing phases of heightened symptom activity over a set period. Subgroup findings are uncertain, as is the approach for those who may not find sufficient change with the initial dose studied in research.


Long-term Studies and Follow-up

To understand the patterns of Delesit beyond the typical short duration of initial efficacy trials, some research was conducted over longer follow-up durations. This type of research helps describe the long-term patterns observed in the studies. Research describes the outcomes related to systemic or functional imbalance, examining how symptoms evolved in the observed populations over many months. However, long-term patterns are not fully established. Follow-up durations were limited in many studies, and certainty remains low regarding the very long-term use of the medication.


Evidence in Special Populations

The research has also explored the use of Delesit in certain special populations. Studies were conducted to assess short-term symptom patterns in children and older adults. Studies indicate that evidence for use in children and adolescents was observed in research contexts involving fluctuating symptoms, with findings describing patterns observed in the studies. Data for certain groups, particularly those with pre-existing comorbid conditions or pregnancy-related populations, remain insufficient.


What is Still Uncertain about Delesit

Transparency in research requires acknowledging the areas where evidence is limited or ongoing. This section clarifies that research provides context but not individual predictions, and findings describe group patterns, not personal outcomes. The main evidence gaps include a need for more robust, head-to-head comparative evidence against all alternative treatments. The research needs to further explore the long-term outcomes and durability of response beyond the relatively short study periods. Data are still emerging regarding the observed use in individuals who may have underlying or comorbid health conditions.

Frequently Asked Questions (FAQ)

Common questions about Delesit (FAQ)


Q: How quickly should I expect to feel any effects of Delesit?

Regulatory studies indicate that the antihistaminic effect of Delesit was observed as early as one hour after a single dose in study participants. This early effect relates to the drug's mechanism of blocking histamine receptors in the body. As with any medication, individual patient responses may vary depending on their specific condition and symptom severity.


Q: I heard Delesit can make you sleepy; is that a known side effect?

Official regulatory documents list somnolence, which is a medical term for drowsiness or sleepiness, as a reported adverse reaction. This effect has been reported in clinical trials involving adult and adolescent patients who received the recommended dose.


Q: Is it normal to feel a change in appetite while taking Delesit?

An increase in appetite is a change that has been reported as an adverse event during the post-marketing surveillance phase of the drug. This information is derived from spontaneous post-marketing reports collected after the medication became available for general use.


Q: Is there a maximum age limit for using Delesit?

Official documents do not establish a specific maximum age limit for using Delesit. However, regulatory information states that there is insufficient experience from studies in patients 65 years and older to confirm whether their response is different from younger adults. For this reason, use in the elderly is approached with caution.


Q: How long does Delesit stay in your system after stopping?

According to the official pharmacological information, the drug has a mean elimination half-life of approximately 27 hours. The half-life describes the time it takes for half of the drug to be processed and cleared from the body.


Q: What if I forget to take a dose of Delesit?

The official patient counseling materials outline the process for managing a missed dose. If a dose is forgotten, the instructions often indicate taking it as soon as the patient remembers. If it is nearly time for the next scheduled dose, the regulatory instruction is typically to skip the missed dose and resume the normal daily schedule, rather than taking two doses simultaneously.


Q: Is Delesit considered an addictive substance?

Delesit is not classified as a controlled substance by the U.S. Drug Enforcement Administration (DEA). This means the drug is not categorized as having an abuse or dependency risk requiring special controls.


Q: Are there different strengths of Delesit available?

Official documents confirm that Delesit is available in multiple strengths and dosage forms. The film-coated tablet is available in a 5 mg strength. The medication is also manufactured in liquid forms and other strengths established for various approved age groups.


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

Regulatory studies do not typically provide a single 'success rate,' but instead report findings on how symptoms changed in study groups. The evidence describes patterns observed in outcomes related to the relief of allergic nasal and non-nasal discomfort, and changes in the severity and size of chronic hives within the study populations.


Q: Can Delesit be crushed or split if it's a tablet?

The official prescribing information provides specific administration guidance for the orally-disintegrating tablets (ODT) and the oral solution form of the drug. Because the regulatory documents do not provide instructions for splitting or crushing the standard film-coated tablet, use should follow the instructions provided on the packaging without alteration.


Q: Is Delesit available as a generic version?

The active ingredient in Delesit, Desloratadine, is available in generic form. Generic availability is a regulatory and marketing status that means non-branded versions of the medicine are commercially offered.


Q: What is the purpose of the black box warning on Delesit's label?

Official documents for the single-ingredient Delesit product confirm that the labeling does not carry a Black Box Warning. Black Box Warnings represent the most serious caution required by the FDA. The drug’s safety information is described in the standard Warnings and Precautions section.


Q: Can Delesit impact a person's ability to drive?

Adverse reactions such as somnolence (drowsiness) have been reported, which indicates a potential for effects on skills required for tasks like driving or operating machinery. According to the regulatory data, any potential impairment would be related to these central nervous system effects.


Q: What's the difference between Delesit and a supplement for the same issue?

Delesit is classified as a prescription drug that has been approved through a government regulatory process. This means its safety and efficacy have been evaluated during the government approval process. In contrast, the regulatory criteria for products marketed as supplements differ from those for prescription drugs.


Q: Do patients generally feel better or worse when starting Delesit?

The experience of starting Delesit varies, as with any medicine. Regulatory studies describe patterns observed regarding the lessening of allergic symptoms in some individuals. However, the official safety data also records the occurrence of common adverse reactions, such as headache, dry mouth, or fatigue.


Q: What are the most common reasons patients stop taking Delesit?

Clinical trials documented the reasons why some patients stopped treatment prematurely. The most common reasons for early discontinuation were due to adverse events, which included pharyngitis, dry mouth, and fatigue. The percentage of patients who stopped for these reasons was small overall.


Q: How is the safety of Delesit tracked after it is approved?

The safety of Delesit is continuously tracked through a process called post-marketing surveillance. This official process involves collecting spontaneous reports of any adverse events that occur after the drug has been approved and is being used by the general population.


Q: Can men and women expect different results from taking Delesit?

Official studies have examined gender differences in how the drug is absorbed and processed by the body (pharmacokinetics). While regulatory data indicates that the amount of drug in the system may be higher in women, this difference was not found to be associated with any clinically relevant changes to the safety profile.


Q: Can Delesit cause any issues with my skin or hair?

The safety information collected since the drug’s approval includes post-marketing reports of skin-related issues such as rash and pruritus (itching). No information regarding hair issues is specifically documented in the official safety label.

How should Delesit be stored and disposed of?

How to Store and Dispose of Delesit (Desloratadine)

Official regulatory documents define specific, mandatory conditions for storing Delesit to maintain the stability and integrity of the medication.

Storage Conditions

Condition Requirement (Official Labeling)
Temperature Store at a temperature not exceeding 30 ,mathrmC (86 mathrmF).
Container & Protection Must be stored in the original package to protect the product from moisture.
Child Safety Like all medicines, it must be stored out of the sight and reach of children.

Disposal Instructions

Regulatory labeling states there are no special requirements necessary for the disposal of the product itself. Any unused or expired Delesit, or waste material derived from it, should be disposed of in accordance with local requirements for pharmaceutical waste.

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

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