Respidox Plus
Respidox Plus Uses, Dosage, Side Effects, Food Interaction and all others data.
Levocetirizine Dihydrochloride is a preparation of Levocetirizine Dihydrochloride. Levocetirizine is the active (levo) isomer of Cetirizine. It is a new highly effective and well-tolerated non-sedating antihistamine with potent antiallergic properties. It has a two-fold higher affinity for H1-receptors than Cetirizine. Levocetirizine has a rapid and long-lasting action, allowing once-a-day administration.
Levocetirizine is a second generation histamine H1 antagonist used to treat various allergic symptoms. It has a long duration of action as it is generally taken once daily, and a wide therapeutic window as animal studies show the maximal nonlethal dose is over 100x a normal dose. Patients are cautioned to avoid tasks that require complete alertness, avoid alertness, and use caution in patients with factors predisposing urinary retention.
Montelukast is a selective leukotriene receptor antagonist that inhibits the effects of cysteinyl leukotrienes in the airways. Cysteinyl leukotrienes and leukotriene receptor occupation have been correlated with the pathophysiology of asthma, including airway oedema, smooth muscle contraction, and altered cellular activity associated with the inflammatory process, which contribute to the signs and symptoms of asthma.
Montelukast is a leukotriene receptor antagonist that demonstrates a marked affinity and selectivity to the cysteinyl leukotriene receptor type-1 in preference to many other crucial airway receptors like the prostanoid, cholinergic, or beta-adrenergic receptors. As a consequence, the agent can elicit substantial blockage of LTD4 leukotriene-mediated bronchoconstriction with doses as low as 5 mg. Moreover, a placebo-controlled, crossover study (n=12) demonstrated that montelukast is capable of inhibiting early and late phase bronchoconstriction caused by antigen challenge by 75% and 57% respectively.
In particular, it has been documented that montelukast can cause bronchodilation as soon as within 2 hours of oral administration. This action can also be additive to the bronchodilation caused by the concomitant use of a beta agonist. Nevertheless, clinical investigations performed with adults 15 years of age and older revealed that no additional clinical benefit is obtained when doses of montelukast greater than 10 mg a day are used.
Additionally, in clinical trials with adults and pediatric asthmatic patients aged 6 to 14 years, it was also determined that montelukast can reduce mean peripheral blood eosinophils by about 13% to 15% from baseline in comparison to placebo during double-blind treatment periods. At the same time, in patients aged 15 years and older who were experiencing seasonal allergic rhinitis, the use of montelukast caused a median reduction of 13% in peripheral blood eosinophil counts when compared to placebo as well.
| Trade Name | Respidox Plus |
| Generic | Acebrophylline + Levocetirizine + Montelukast |
| Weight | 200mg |
| Type | Tablet |
| Therapeutic Class | |
| Manufacturer | Life Line Remedies,ltd |
| Available Country | India |
| Last Updated: | September 19, 2023 at 7:00 am |
Uses
Levocetirizine Dihydrochloride is used for the treatment of symptoms associated with allergic conditions such as seasonal allergic rhinitis, perennial allergic rhinitis and chronic idiopathic urticaria.
Montelukast is used for-
- The prophylaxis and chronic treatment of asthma in adults and paediatric patients 12 months of age and older.
- The relief of symptoms of seasonal allergic rhinitis in adults and paediatric patients 2 years of age and older.
Respidox Plus is also used to associated treatment for these conditions: Allergic Rhinitis (AR), Chronic Idiopathic Urticaria, Common Cold, Nasal Congestion, Perennial Allergic Rhinitis (PAR), Seasonal Allergic RhinitisAsthma, Exercise-Induced Bronchospasm, Perennial Allergic Rhinitis (PAR), Seasonal Allergic Rhinitis
How Respidox Plus works
Levocetirizine selectively inhibits histamine H1 receptors. This action prevents histamine from activating this receptor and causing effects like smooth muscle contraction, increased permeability of vascular endothelium, histidine uptake in basophils, stimulation of cough receptors, and stimulation of flare responses in the nervous system.
Cysteinyl leukotrienes (CysLT) like LTC4, LTD4, and LTE4, among others, are eicosanoids released by a variety of cells like mast cells and eosinophils. When such CysLT bind to corresponding CysLT receptors like CysLT type-1 receptors located on respiratory airway smooth muscle cells, airway macrophages, and on various pro-inflammatory cells like eosinophils and some specific myeloid stem cells activities that facilitate the pathophysiology of asthma and allergic rhinitis are stimulated.
In particular, CysLT-mediated airway bronchoconstriction, occluding mucous secretion, vascular permeability, and eosinophil recruitment are all types of effects that facilitate asthma. Alternatively, in allergic rhinitis, CysLTs are released by the nasal mucosa when exposed to allergens during both early and late phase reactions and participate in eliciting symptoms of allergic rhinitis like a congested nose and airway.
Subsequently, montelukast is a leukotriene receptor antagonist that binds with high affinity and selectivity to the CysLT type 1 receptor, which consequently assists in inhibiting any physiological actions of CysLTs like LTC4, LTD4, and LTE4 at the receptor that may facilitate asthma or allergic rhinitis.
Dosage
Respidox Plus dosage
Adults and children 12 years of age and older: 5 mg once daily in the evening
Children 6 to 11 years of age: 2.5 mg once daily in the evening
Children 6 months to 5 years of age: 1.25 mg (1/2 teaspoon oral solution) once daily in the evening
Renal Impairment: Adjust the dose in patients 12 years of age and older with decreased renal function
General information: Montelukast should be taken once daily. For asthma, the dose should be taken in the evening. For seasonal allergic rhinitis, the time of administration may be individualised to suit patients needs. Patients with both asthma and seasonal allergic rhinitis should take only one tablet daily in the evening.
Adults and adolescents 15 years of age and older with asthma or seasonal allergic rhinitis: The dosage is one 10 mg tablet daily.
Paediatric patients 6 to 14 years of age with asthma or seasonal allergic rhinitis: The dosage is one 5 mg tablet daily. No dosage adjustment within this age group is necessary.
Paediatric patients 2 to 5 years of age with asthma or seasonal allergic rhinitis: The dosage is one 4 mg tablet daily.
Paediatric patients 12 to 23 months of age with asthma: The dosage is one 4 mg tablet daily to be taken in the evening. Safety and effectiveness in paediatric patients younger than 12 months of age have not been established.
Side Effects
The most common adverse reactions (rate ≥2% and > placebo) were somnolence, nasopharyngitis, fatigue, dry mouth, and pharyngitis in subjects 12 years of age and older, and pyrexia, somnolence, cough, and epistaxis in children 6 to 12 years of age. In subjects 1 to 5 years of age, the most common adverse reactions (rate ≥2% and > placebo) were pyrexia, diarrhea, vomiting, and otitis media. In subjects 6 to 11 months of age, the most common adverse reactions (rate ≥3% and > placebo) were diarrhea and constipation.
Adolescents and Adults 15 years of age and older: In placebo-controlled clinical trials, Montelukast has been evaluated for safety in approximately 2600 adolescent and adult patients of 15 years and older, the following adverse experiences reported with Montelukast occurred in greater than or equal to 1% of patients.
- General: Asthenia/fatigue, Fever, Pain
- Gastrointestinal: Dyspepsia, Gastroenteritis; Nervous
- System/Psychiatric: Dizziness, Headache
- Respiratory System: Congestion, Cough, Influenza
- Skin: Rash; Laboratory adverse experiences: ALT increase, AST increase, Pyuria.
Paediatric patients 6 to 14 years of age: In paediatric patients receiving montelukast, the following events occurred with a frequency 2% are diarrhoea, laryngitis, pharyngitis, nausea, otitis, sinusitis, and viral infection. With prolonged treatment, the adverse profile did not change significantly.
Toxicity
Patients experiencing an overdose may present with drowsiness. Children may become agitated and restless before drowsiness. Patients should be treated with supportive measures. Dialysis will not assist in removing the drug from the body.
The maximal nonlethal dose in mice and rats is 240mg/kg.
The adverse effects associated with overdosage of montelukast include abdominal pain, somnolence, thirst, headache, vomiting, psychomotor hyperactivity, and less frequently, convulsion.
The oral LD50 value determined for mice and rats is >5000 mg/kg.
Montelukast has not been studied in pregnant women. Consequently, it should be used during pregnancy only if clearly needed.
Additionally, as it is unknown whether montelukast is excreted into human breast milk, there is also caution regarding the use of the medication in nursing mothers.
The plasma half-life of montelukast is somewhat prolonged in elderly patients, although no dosage adjustment is generally necessary.
Precaution
Epileptic patients and patients at risk of convulsions. Renal impairment. Pregnancy and lactation.
Montelukast is not indicated for use in the reversal of bronchospasm in acute asthma attacks (in case of status asthmaticus). Patients with known aspirin sensitivity should continue avoidance of aspirin or other NSAID, while taking Montelukast.
In rare cases, patients on therapy with Montelukast may present with systemic eosinophilia, sometimes presenting with clinical features of vasculitis consistent with churg-strauss syndrome, a condition which is often treated with systemic corticosteroid therapy. Physician should be alert to eosinophilia, vasculitic rash, worsening pulmonary symptoms, cardiac complications, and/or neuropathy presenting in their patients. A causal association between Montelukast and these underlying conditions has not been established.
Interaction
Montelukast has been administered with other therapies routinely used in the prophylaxis and chronic treatment of asthma with no apparent increase in adverse reactions. In drug interaction studies, the recommended clinical dose of montelukast did not have clinically important effects on the pharmacokinetics of the following drugs: Theophylline, Prednisolone, oral contraceptives (Norethindrone 1 mg/Ethinyl Oestradiol 35 mg), Terfenadine, Digoxin, and Warfarin.
Although additional specific interaction studies were not performed, Montelukast was used concomitantly with a wide range of commonly prescribed drugs in clinical studies without clinically evident adverse interactions. These medications included thyroid hormones, sedative hypnotic, non-steroidal anti-inflammatory agents, benzodiazepines, and decongestants.
Phenobarbital, which induces hepatic metabolism, decreased the AUC of Montelukast approximately 40% following a single 10 mg dose of Montelukast. No dosage adjustment for Montelukast is recommended. It is reasonable to employ appropriate clinical monitoring when potent cytochrome P450 enzyme inducers, such as Phenobarbital or Rifampin, are co-administered with Montelukast.
Volume of Distribution
The volume of distribution of levocetirizine is 0.33±0.02L/kg.
The steady-state volume of distribution recorded for montelukast is an average between 8 to 11 litres.
Elimination Route
Following a 5mg oral dose of levocetirizine, a Cmax of 0.27±0.04µg/mL with a Tmax of 0.75±0.50h. The AUC of levocetirizine is 2.31±0.50µg*h/mL. Taking levocetirizine with food does not affect the AUC but delays Tmax by 1.25 hours and lowers Cmax by 36%.
It has been observed that montelukast is quickly absorbed following administration by the oral route. The oral bioavailability documented for the drug is 64%. Furthermore, it seems that having a regular meal in the morning or even a high fat snack in the evening does not affect the absorption of montelukast.
Half Life
The average half life of levocetirizine is 7.05±1.54 hours.
Studies have demonstrated that the mean plasma half-life of montelukast varies from 2.7 to 5.5 hours when observed in healthy young adults.
Clearance
The average clearance of levocetirizine is 0.57±0.18mL/min/kg.
The plasma clearance documented for montelukast is an average of 45 mL/min when observed in healthy adults.
Elimination Route
168 hours post dose an average of 85.4% of a radiolabeled dose was recovered with an average of 80.8% in the urine and 9.5% in the feces. In the urine, 77% of the dose was recovered as unchanged drug, 0.5% as the M8 and M9 metabolites, 0.4% as the M10a metabolite, 0.4% as the M10b metabolite, 0.3% as the M3 metabolite, 0.3% as the M4 and M5 metabolite, 0.2% as the M2 metabolite, and 0.1% as the M1 metabolite. In the feces, 9.0% of the dose was recovered as unchanged drug, 1.0% as the M4 and M5 metabolite, and 0.1% as the M1 metabolite.
It has been reported that montelukast and its metabolites are almost exclusively excreted in the bile and into the feces.
Pregnancy & Breastfeeding use
Pregnancy: The safety of Levocetirizine in pregnancy has not been established. Therefore, it should be used with caution during pregnancy and only if the potential benefits to the mother outweigh any risks to the foetus.
Lactation: Levocetirizine passes into breast milk. So, it should be used with caution in nursing mothers and only if the expected benefit to the mother is greater than the risk to the nursing infant.
Pregnancy: Montelukast crosses the placenta following oral dosing in rats and rabbits. There are, however, no adequate and well controlled studies in pregnant women. Because animal reproduction studies are not always predictive of human response, Montelukast should be used during pregnancy only if clearly needed.
Lactation: It is not known if Montelukast is excreted in human milk. Because many drugs are excreted in human milk, caution should be exercised when Montelukast is given to a nursing mother.
Contraindication
It is contraindicated in patients who are hypersensitive to this medication or to any of its ingredients.
Montelukast is contraindicated to patients with hypersensitivity to any component of this product.
Special Warning
Paediatric use: Not recommended for use in children less than 6 years of age.
Paediatric use: Safety and efficacy of Montelukast has been established in adequate and well controlled studies in paediatric patients with asthma and allergic rhinitis between age 1 to 14 years. Long term trials evaluatingthe effect of chronic administration of Montelukast on linear growth in paediatric patients have not been conducted.
Geriatric use: Of the total number of subjects in clinical studies of Montelukast, 3.5% were 65 years of age and over and 0.4% were 75 years of age and over. No overall differences in safety or effectiveness were observed between these subjects and younger subjects. But greater sensitivity of some older individuals cannot be ruled out.
Acute Overdose
Symptoms: Drowsiness, agitation, restlessness, confusion, diarrhoea, dizziness, fatigue, headache, malaise, mydriasis, pruritus, sedation, somnolence, stupor, tachycardia, tremor and urinary retention.
Management: Symptomatic and supportive treatment. Gastric lavage must be considered shortly following ingestion.
Symptoms: Abdominal pain, somnolence, thirst, headache, vomiting, and psychomotor hyperactivity.
Management: Supportive and symptomatic treatment. If indicated, unabsorbed material should be removed from the GI tract.
Storage Condition
Store between 20-25°C.
Store at 25° C. Protect from moisture and light.
Innovators Monograph
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