Loratadine is a non-sedative histamine H1-receptor antagonist with anti-allergic properties. Loratadine is a long acting tricyclic anti-histamine with selective peripheral H1-receptor antagonistic activity and no central sedative or anti-cholinergic effect.
Pseudoephedrine is an orally active sympathomimetic amine and exerts a decongestant action on the nasal mucosa. This is recognized as an effective agent for the relief of nasal congestion due to allergic rhinitis. It has nasal and bronchial decongestant activity.
Pseudoephedrine is both an α-and β-adrenergic receptor agonist. It causes vasoconstriction via direct stimulation of α-adrenergic receptors of the respiratory mucosa. It also directly stimulates β-adrenergic receptors causing bronchial relaxation, increased heart rate and contractility.