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Antihistamines do not stop the formation of histamine nor do they stop the conflict between the Ig E and antigen.Therefore, antihistamines do not stop the allergic reaction but protect tissues from some of its effects.Sedating antihistamines cause drowsiness and may therefore affect your ability to drive or operate machinery safely.
There are two different types of antihistamine – the older group, sedating antihistamines, can enter the brain and cause drowsiness, while the newer non-sedating antihistamines do not.
Itching can occur during the day but is usually worse in early evening and at night, so sedating antihistamines are used because they help make you sleepy, as well as reducing the itch.
This is often referred to as an 'itch-scratch-itch' cycle.
It leads to thickening and weeping of the skin and generally makes the eczema worse and more likely to become infected because scratching breaks the skin.
There might be a problem taking some herbal remedies and supplements alongside loratadine - especially ones that cause sleepiness, a dry mouth or make it difficult to pee.
Antihistamines: Drugs that combat the histamine released during an allergic reaction by blocking the action of the histamine on the tissue.The released histamine binds to its receptors (H-1 receptors) causing a chain reaction that includes an increase in blood flow to the area, and the release of other chemicals that add to the allergic response. Antihistamines work by blocking histamine receptors, therefore reducing the reactions that cause itching.However, histamine is only one of many substances in the body that cause itching, and these medicines are mainly of value in eczema because they cause sedation.These antihistamines will not be discussed further.) Antihistamines also may be used to treat motion sickness, insomnia (difficulty sleeping), and anxiety.Antihistamines work by blocking the effects of a chemical called histamine that is responsible for many allergic symptoms.Antihistamines are medicines that can be used to relieve severe itching and help break this cycle.