Forms of Loratadine

Loratadine (INN) is a second-generation H1 histamine antagonist drug used to treat allergies. Structurally, it is closely related to tricyclic antidepressants, such as imipramine, and is distantly related to the atypical antipsychotic quetiapine.

Loratadine is marketed by Schering-Plough under several trade names (e.g., Claritin) and also by Shionogi in Japan. It is available as a generic drug and is marketed for its non-sedating properties. In a version named Claritin-D or Clarinase, it is combined with pseudoephedrine, a decongestant; this makes it useful for colds as well as allergies but adds potential side-effects of insomnia, anxiety, and nervousness.

Loratadine is available as tablets, oral suspension, and syrup, and also in combination with pseudoephedrine. Also available are quick-dissolving tablets, which are marketed as being faster to get into one's circulatory system but require special handling to avoid degrading in the package.

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