Reading File
Finding Sources
Finding Sources
Searching the Web
levocetirizine montelukast syrup children dosage indications
Reading File
Reading File
Reading File
Reading File
Here is a complete overview of Lemon Syrup (Levocetirizine Dihydrochloride + Montelukast Sodium) by Fitwel:
Lemon Syrup - Levocetirizine + Montelukast (60 mL)
What's in It
Each 5 mL typically contains:
- Levocetirizine Dihydrochloride - 2.5 mg
- Montelukast Sodium - 4.0 mg
This is a prescription (Rx) combination formulated for children, available in a lemon-flavored syrup.
Component 1: Levocetirizine Dihydrochloride
Class: Second-generation H1 antihistamine (piperazine derivative)
Mechanism: Selectively blocks histamine H1 receptors. It is the active R-enantiomer of cetirizine, with slightly greater potency, allowing it to work at half the dose compared to cetirizine with less sedation. It also has mast cell-stabilizing and anti-inflammatory properties. - Goodman & Gilman's Pharmacological Basis of Therapeutics
Key properties:
- Minimal anticholinergic effects
- Negligible CNS penetration (low sedation vs. first-generation antihistamines)
- Excreted largely unchanged in urine
- Onset of action within 1 hour of oral dose
- FDA-classified as mildly sedating, but far less so than first-generation antihistamines - Cummings Otolaryngology
Relieves: Sneezing, itching, rhinorrhea, watery/itchy eyes - does NOT significantly relieve nasal congestion on its own.
Component 2: Montelukast Sodium
Class: Leukotriene receptor antagonist (LTRA)
Mechanism: Blocks leukotriene D4 (LTD4) receptors. Leukotrienes are inflammatory mediators released from mast cells and eosinophils that cause bronchoconstriction, mucus secretion, and airway inflammation. Blocking them prevents airway responses to exercise and antigen challenges. - Katzung's Basic and Clinical Pharmacology
Key properties:
- Oral, once daily
- Good safety profile with minimal toxicity
- Not for reversal of acute bronchospasm - used as prophylaxis/prevention
- Particularly effective in aspirin-induced asthma and exercise-induced bronchoconstriction
- Should NOT be abruptly substituted for inhaled or oral corticosteroids
Why This Combination?
Combining both drugs makes rational sense for allergic disease because:
- Levocetirizine blocks histamine-mediated symptoms (itching, sneezing, runny nose, eye symptoms)
- Montelukast blocks leukotriene-mediated symptoms (bronchoconstriction, congestion, airway inflammation)
- Together, they target two different inflammatory pathways simultaneously
Indications
- Allergic rhinitis (seasonal and perennial) - relief and prophylaxis
- Comorbid asthma and allergic rhinitis
- Allergic symptoms in children
Dosage (Pediatric)
| Age | Dose |
|---|---|
| 2-5 years | 5 mL (one teaspoon) once daily |
| 6-11 years | 5 mL once daily (levocetirizine 2.5 mg + montelukast 4 mg) |
- Given preferably in the evening
- Do not exceed recommended doses
Contraindications
- Known hypersensitivity to montelukast, levocetirizine, cetirizine, or any excipient
- Children with renal impairment (6 months to 11 years) - should not be given, as levocetirizine is renally excreted
Key Warnings
- Montelukast is NOT for acute asthma attacks - it does not reverse bronchospasm
- Do not abruptly replace corticosteroids with this medication
- FDA has flagged montelukast with a neuropsychiatric warning (behavioral changes, sleep disturbances, suicidal ideation in rare cases) - monitor patients accordingly
- Levocetirizine can cause mild drowsiness - caution with activities requiring alertness
In Summary
Lemon Syrup is a well-established pediatric combination for allergic conditions, targeting both the histamine and leukotriene pathways. It is prescription-only, given once daily in the evening, and well-tolerated in children aged 2 and above. Always use under medical supervision, especially in children with kidney problems or asthma.
This is a shared conversation. Sign in to Orris to start your own chat.