Loratadine
Overview
Tricyclic antidepressant
Tricyclic antidepressants are heterocyclic chemical compounds used primarily as antidepressants. The TCAs were first discovered in the early 1950s and were subsequently introduced later in the decade; they are named after their chemical structure, which contains three rings of atoms...
s such as imipramine
Imipramine
Imipramine , also known as melipramine, is an antidepressant medication, a tricyclic antidepressant of the dibenzazepine group...
, and distantly related to the atypical antipsychotic
Antipsychotic
An antipsychotic is a tranquilizing psychiatric medication primarily used to manage psychosis , particularly in schizophrenia and bipolar disorder. A first generation of antipsychotics, known as typical antipsychotics, was discovered in the 1950s...
quetiapine
Quetiapine
Quetiapine , is an atypical antipsychotic approved for the treatment of schizophrenia, and bipolar disorder....
. It is marketed by Schering-Plough
Schering-Plough
Schering-Plough Corporation was a United States-based pharmaceutical company. It was founded in 1851 by Ernst Christian Friedrich Schering as Schering AG in Germany. In 1971, the Schering Corporation merged with Plough to form Schering-Plough. On November 4, 2009 Merck & Co...
under several trade names such as Claritin, and by Shionogi
Shionogi
is a Japanese pharmaceutical company best known for developing Crestor. Medical supply and brand name also uses Shionogi .Shionogi has business roots that date back to 1878, and was incorporated in 1919. Among the medicines produced are for hyperlipidaemia, antibiotics, and cancer medicines.In...
in Japan. Loratadine is available as a generic drug
Generic drug
A generic drug is a drug defined as "a drug product that is comparable to brand/reference listed drug product in dosage form, strength, route of administration, quality and performance characteristics, and intended use." It has also been defined as a term referring to any drug marketed under its...
and is marketed for its non-sedating properties. In a version named Claritin-D or Clarinase, the substance is combined with pseudoephedrine
Pseudoephedrine
Pseudoephedrine is a sympathomimetic drug of the phenethylamine and amphetamine chemical classes. It is used as a nasal/sinus decongestant and stimulant, or as a wakefulness-promoting agent....
, a decongestant; this makes it useful for colds as well as allergies, but adds potential side-effects of insomnia
Insomnia
Insomnia is most often defined by an individual's report of sleeping difficulties. While the term is sometimes used in sleep literature to describe a disorder demonstrated by polysomnographic evidence of disturbed sleep, insomnia is often defined as a positive response to either of two questions:...
, nervousness, and anxiety.
Schering-Plough developed loratadine as part of a quest for a potential blockbuster drug: a nonsedating
Sedative
A sedative or tranquilizer is a substance that induces sedation by reducing irritability or excitement....
antihistamine.
Unanswered Questions
