Montelukast is a selective and orally active leukotriene receptor antagonist that inhibits the cysteinyl leukotriene CysLT1 receptors.
Levocetirizine is a selective histamine H1 antagonist used to treat a variety of allergic symptoms. It is the R enantiomer of cetirizine. Levocetirizine has greater affinity for the histamine H1 receptor than cetirizine.
Absorption: is quickly absorbed following administration by the oral route
Volume of distribution: 8 to 11 litres
Protein binding: 99%
Half life: 2.7-5.5 hours
Metabolism: highly metabolized and typically so by the cytochrome P450, 3A4, 2C8, and 2C9 isoenzymes.
Excretion: about 86% of Montelukast and its metabolites are almost exclusively excreted in the bile and into the feces.
Absorption: rapidly and extensively absorbed following oral administration. In adults, peak plasma concentrations are achieved 0.9 hour after administration of the oral tablet
Volume of distribution: approximately 0.4 L/kg
Protein binding: 91-92%
Metabolism: poorly metabolized and mostly excreted via the urine
Route of elimination: renal excretion
Half life: 8-9 hours
Clearance: 0.63 mL/kg/min
Montelukast is a highly selective leukotriene receptor antagonist that binds with high affinity to the cysteinyl leukotriene receptor for leukotrienes D4 and E4 thereby inhibits leukotriene physiologic effects (such as airway edema, smooth muscle contraction and impairment of normal cellular activity).
Levocetirizine is the active enantiomer of cetirizine. It's principal effects are mediated via selective inhibition of H1 receptors.
- Seasonal and perennial allergic rhinitis
- Allergic dermatitis
- Chronic urticaria
- Atopic eczema
- Excercise- induced asthma
- Add on therapy to chronic persistent asthma
This medication is taken orally with or without food usually once daily in the evening.
Skin rash, mood changes, tremors, headache, stomach pain, heart burn, upset stomach, nausea, diarrhoea, tooth pain, tiredness, fever, stuffy nose, sore throat, cough & hoarseness.
Dry mouth, fatigue, runny or stuffy nose, sore throat, central nervous system depression, drowsiness, sedation, dizziness, insomnia, blurred vision, impotence, hypertension, wheezing, sweating, ECG changes & tinnitus.
Montelukast should not be used during sudden asthma attack, to treat status asthmaticus. It should not be used in place of inhaled/ oral corticosteroids. This drug also may increase risk of mental health problems.
Levocetirizine should not be used if you are allergic to any of its ingredient and should be kept out of the reach of children.