Side effects of sedating antihistamines
Fexofenadine is an oral, "second generation" antihistamine that is used to treat the signs and symptoms of allergy and hives.
These antihistamines can be short or long lasting and come in various forms depending on what is being treated.
This means it has an effect on small blood vessels, resulting in dilated capillaries (redness), and leakage of protein-rich fluid into surrounding skin (swelling).
Histamine affects nearby nerves resulting in itching.
As well as tablets, antihistamines are available as injections, elixirs, and creams.
An injection can be given in case of severe allergic reaction (although in such cases, adrenaline (epinephrine) may be more appropriate and can be life-saving).
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Antihistamines are available as tablets, syrups, inhalers, nasal sprays, and eye drops.