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Loratadine Spray is an antihistamine drug preparation used locally, which is mainly used to alleviate nasal symptoms caused by allergic rhinitis (such as farinose, dust mite allergy, etc.). It belongs to the second generation of non sedating antihistamines, which relieve symptoms by blocking the histamine H1 receptor and inhibiting allergic reactions caused by histamine (such as sneezing, runny nose, nasal itching, nasal congestion, etc.). This substance directly acts on the nasal mucosa, has a fast local effect, can reduce systemic absorption, and lower the risk of side effects such as drowsiness (compared to oral preparations). Usually used for adults and children (specific age should refer to instructions or medical advice), especially suitable for those who have difficulty swallowing oral medications or need rapid relief of symptoms. To avoid drug reactions, it should not be used in combination with macrolide antibiotics (such as erythromycin) or antifungal drugs (such as ketoconazole), which may increase blood drug concentrations.
Additional information of chemical compound:
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Loratadine COA
Preventive application of Loratadine Spray in exercise-induced rhinitis
Exercise plays an important role in maintaining physical health and enhancing physical fitness. However, many people may experience nasal discomfort symptoms such as nasal congestion, runny nose, sneezing, etc. during exercise, which may be a manifestation of exercise-induced rhinitis. Exercise induced rhinitis not only affects the quality and effectiveness of exercise, but may also cause discomfort and distress to athletes, and in severe cases, may even interfere with daily life. Loratadine Spray is a commonly used antihistamine nasal spray, which has significant effect in relieving allergic rhinitis symptoms.
Overview of Exercise Induced Rhinitis
Pathogenesis
Neuroregulation imbalance: During exercise, the excitability of the sympathetic and parasympathetic nervous systems in the human body changes. Under normal circumstances, sympathetic nervous system stimulation can cause constriction of nasal mucosal blood vessels and reduce secretion; The parasympathetic nervous system excitation is the opposite. In patients with exercise-induced rhinitis, there may be an imbalance in neural regulation, leading to relative excitation of the parasympathetic nervous system, causing dilation of nasal mucosal blood vessels and increased glandular secretion, resulting in symptoms such as nasal congestion and runny nose.
Nasal mucosal inflammation: During exercise, the amount of air inhaled increases, and allergens, irritants, and other substances in the air are more likely to enter the nasal cavity, stimulating the nasal mucosa and triggering an inflammatory response. The release of inflammatory mediators such as histamine and leukotrienes further exacerbates congestion, edema, and increased secretion of nasal mucosa, leading to the onset of rhinitis symptoms.
Exercise induced immune response: Some athletes may develop immune responses to certain factors in the exercise itself or the exercise environment. Exercise can cause changes in the body's immune system, altering the activity of immune cells and releasing inflammatory factors, thereby inducing nasal inflammation.
clinical manifestation
The typical symptoms of exercise-induced rhinitis include nasal congestion, runny nose, sneezing, nasal itching, etc. Nasal congestion can be unilateral or bilateral, with varying degrees of severity. In severe cases, it can affect breathing and lead to decreased exercise endurance. Most of the runny nose is clear water like, with a large amount that can flow out frequently. Sneezing usually occurs continuously, with several or even dozens of sneezes at a time. Nasal itching is also a common symptom, and patients often feel unbearable itching in the nasal cavity and cannot resist rubbing their nose. These symptoms usually appear shortly after the start of exercise and gradually improve after the exercise stops, but some patients may experience prolonged symptoms.
Impact on athletic performance: Nasal congestion can lead to poor breathing, insufficient oxygen intake during exercise, affecting muscle energy supply and endurance, and reducing athletic performance. Sneezing and runny nose can distract the attention of athletes, disrupt the coordination of their movements, and increase the risk of sports injuries.
Reduced quality of life: The symptoms of exercise-induced rhinitis not only occur during exercise, but may also persist for a period of time after exercise, affecting the patient's daily life such as sleep, work, and study. Long term recurrent attacks may also lead to negative emotions such as anxiety and depression in patients, further reducing their quality of life.
Complications: If exercise induced rhinitis is not treated promptly and effectively, it may lead to complications such as sinusitis and otitis media. Inflammation of the nasal mucosa can spread to the sinuses, causing sinusitis and presenting symptoms such as headache, fever, and purulent nasal discharge; Inflammation spreads through the Eustachian tube to the middle ear, which can cause otitis media, leading to ear pain, hearing loss, etc.
pharmacological property
Drug components and mechanism of action
The main active ingredient of Loratadine Spray is loratadine, which is a second-generation non sedating antihistamine. Histamine is one of the main mediators that cause symptoms of allergic rhinitis. When the human body comes into contact with allergens, mast cells release histamine, which binds to H1 receptors on the nasal mucosa, triggering a series of allergic reactions such as vasodilation and increased glandular secretion. Loratadine competitively binds to H1 receptors, blocking the binding of histamine to receptors, thereby inhibiting histamine induced allergic reactions and relieving symptoms such as nasal congestion, runny nose, and sneezing.
Pharmacokinetic characteristics
Loratadine is rapidly absorbed after oral administration and metabolized into the active metabolite desloratadine in the liver. Desloratadine has a stronger antihistamine effect and a longer duration of action. Loratadine directly acts on the nasal mucosa, with high local drug concentration, fast onset, and can quickly relieve nasal symptoms. The drug forms a drug film on the surface of the nasal mucosa, which continuously exerts its antihistamine effect, reducing the dosage and side effects of systemic medication.
Safety and tolerability
Loratadine, as a second-generation antihistamine, has good safety and tolerability. Compared with the first generation antihistamines, it is less likely to cross the blood-brain barrier and has a weaker inhibitory effect on the central nervous system, resulting in a lower incidence of adverse reactions such as drowsiness and fatigue. Loratadine is used topically with minimal systemic absorption, further reducing the risk of adverse reactions. Common adverse reactions include dryness of the nasal cavity, mild stinging sensation, etc. The symptoms are generally mild and can be relieved on their own.
The effectiveness of this substance in preventing exercise-induced rhinitis
Clinical research evidence
Multiple clinical studies have shown that Loratadine has significant effects in preventing exercise-induced rhinitis. In a randomized controlled trial, exercisers with exercise-induced rhinitis were divided into two groups, one group used Loratadine Spray before exercise, and the other group used placebo spray. The results showed that athletes using Loratadine Spray had significantly lower incidence and severity of symptoms such as nasal congestion, runny nose, and sneezing during exercise compared to the placebo group, and their exercise endurance and performance were also significantly improved.
Analysis of Mechanism of Action
Loratadine inhibits the binding of histamine to H1 receptors, blocking histamine induced nasal mucosal inflammation and preventing the occurrence of exercise-induced rhinitis. Using the spray before exercise can form a protective barrier on the surface of nasal mucosa, reduce the irritation of allergens and irritants inhaled during exercise to nasal mucosa, reduce the release of inflammatory mediators, maintain the normal physiological function of nasal mucosa, and reduce the occurrence of symptoms such as nasal congestion and runny nose.
Comparison with other prevention methods
Compared to other methods of preventing exercise-induced rhinitis, Loratadine has unique advantages. Wearing a mask can reduce the inhalation of allergens and irritants to some extent, but it may affect the smoothness of breathing, especially during high-intensity exercise. Although avoiding exercise in environments with high levels of allergens can reduce the risk of developing the disease, it is difficult to implement for some people who must engage in outdoor exercise. Loratadine Spray is easy to use, just spray it into the nasal cavity before exercise, it does not affect the normal progress of exercise, and the preventive effect is definite.
Usage method in preventing exercise-induced rhinitis
Timing of Use
It is recommended to use Loratadine Spray 15-30 minutes before exercise, which can fully distribute the medication on the nasal mucosa, form an effective protective barrier, and have a preventive effect at the beginning of exercise. For situations where the exercise time is relatively long, it is advisable to administer additional sprays during the exercise process based on the duration of the medication and the severity of the symptoms.
Dosage used
Generally, adults should spray 1-2 sprays per nostril each time, and the daily usage frequency can be adjusted according to the doctor's advice and individual symptoms. The dosage for children should be appropriately reduced according to age and weight, and the specific dosage should follow the guidance of a doctor.
Instructions for use
Before use, clean the nasal cavity and blow your nose to keep it unobstructed. Shake the medicine bottle evenly, insert the nozzle into one nostril, gently press the nozzle, and breathe through the mouth to evenly spray the medicine onto the nasal mucosa. Then spray the other nostril in the same way. Clean the nozzle with clean water after use to keep it clean.
In the late 1970s and 1980s, medicinal chemists began to purposefully search for antihistamines that could circumvent the blood-brain barrier. The core strategy of this' molecular hunting 'has shifted from accidental discoveries in the past to rational drug design based on structure. Its guiding principle is clear and firm: to design a molecule that has a highly selective antagonistic effect on peripheral H1 receptors, but is difficult to enter the central nervous system at the same time
In 1988, loratadine tablets were first approved for sale in the Netherlands under the trade name "Clarityne". Subsequently, it quickly became popular worldwide with its outstanding effectiveness and core advantage of no drowsiness, becoming a benchmark for second-generation antihistamines. Xianling Baoya established a decade long market hegemony with this medicine.
In 2002, it was the year when the patent for loratadine of Xianling Baoya Company expired. This is a critical time point. During the patent protection period, the original research company has enough power to develop new dosage forms (such as sprays, syrup, etc.) to extend the product life cycle, cover a wider range of patient groups, and build a stronger product moat.
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