The histamine then triggers an allergic reaction that most commonly involves symptoms such as itchy, watering eyes, a runny or blocked nose or sneezing and skin rashes. It reacts by making our blood vessels and skin swell, which are two natural defence mechanisms.īut if you have an allergy, your body will mistake something harmless, such as pollen, animal hair or house dust – as a threat and produce histamine. Histamine is usually released when the body detects something harmful, such as an infection. They work by blocking the way the substance, histamine, impacts the body. Are less likely to make you feel drowsy – they include cetirizine, fexofenadine and loratadine.Īntihistamines come in various different forms, which includes tablets, capsules, liquids, syrups, creams, lotions, gels, eye drops and nasal sprays.
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