Less sedating

Their large molecular size and the fact that they have a different ionic charge also impedes this transfer.

In some cases, however, individuals with a low threshold for the medication may find they experience slight sleepiness after taking them or after taking a higher than recommended dose.

Meanwhile, the authors remind readers that there is no role for antihistamines for cold and flu symptoms, nor for acute management of anaphylaxis. Other chemicals are also released, adding to the reaction and prompting an increase in blood flow to the affected area.In the case of hayfever, these allergic symptoms include red, itchy, and watery eyes, sneezing, a runny nose, and nasal congestion caused by inflammation of the airways.Desloratadine is a purified single isomer version of loratadine, which contains a mixture of active and inactive isomers.In this way desloratadine is designed to have even less side effects than loratadine because it only uses the therapeutically-active isomer.

They are all effective antihistamines that are less sedating and have relatively few side effects.