Allegra non sedating antihistamines the new rules internet dating

Second generation antihistamines include cetirizine hydrochloride (Zyrtec), loratadine (Claritin, Claratyne), fexofenadine hydrochloride (Allegra, Telfast), and desloratadine (Claramax, Clarinex).

Confusingly, these are sometimes also referred to as third generation antihistamines.

Telfast® is an effective, long-lasting and non-sedating prescription antihistamine that can be taken once or twice daily (depending on dosage and indication) for the treatment of seasonal allergy (hay fever) and hives (chronic idiopathic urticaria).

Filed Under: Allergies, consumer information, Cough and Cold, Medicine, medicine safety, medicines, patient information, side effects, Sleep.

Tags: Actifed, Allegra, antihistamines, Benadryl, Claritin, decongestant, diphenhydramine, Sominex, sudafed Q: Every summer my nose runs and my eyes itch from my allergies. Antihistamines work by keeping histamine locked away inside your body.

The first of this class of drug to go on the market was Seldane (terfenadine), which was introduced in 1985 by Hoechst Marion Roussel. In the body, terfenadine is normally metabolized into fexofenadine--the active ingredient responsible for the antihistamine's activity--by converting a methyl into a carboxylate group.

But metabolism of terfenadine can be hindered by liver disease, grapefruit juice, and other medications such as the antibiotic erythromycin.

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