Loratadine is a second generation antihistamine used to manage symptoms of allergic rhinitis.
to their lack of sedative and CNS adverse effects, loratadine along
with other second generation antihistamines have become preferable over
their 1st generation counterparts in many clinical situations.
Loratadine is a piperidine histamine H1-receptor antagonist with anti-allergic properties and without sedative effects. Loratadine blocks the H1 histamine receptor and prevents the symptoms that are caused by histamine
activity on capillaries, bronchial smooth muscle, and gastrointestinal
smooth muscle, including vasodilatation, increased capillary
permeability, bronchoconstriction, and spasmodic contraction of
gastrointestinal smooth muscle. Loratadine does not cross the
blood-brain barrier and does not cause central nervous system effects.