List of sedating antihistamines
Drinking alcohol with a sedating antihistamine can increase the drowsiness it causes and should be avoided.Also beware of a 'hangover' effect in the morning if the tablets are taken too late at night.The most commonly used ones are promethazine (Phenergan), hydroxyzine (Atarax), or alimemazine (Vallergan).Non-sedating antihistamines such as cetirizine or loratadine are not effective at controlling the itch of eczema.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 because they cause sedation.These studies correlated prescriptions issued in general practice with events reported by the patients to their general practitioners after the drug was dispensed.
Side-effects from antihistamines are more likely to occur in children and the elderly, and some of the most common ones associated with this type of medicine are listed below.
However, if itching is still a problem your doctor may prescribe you an antihistamine.
Antihistamines are most commonly used to control the symptoms of allergies such as hay fever.
In these conditions they work by preventing the actions of histamine, which is a substance produced by the body as part of its natural defences.
It's stored in cells called mast cells, in almost all tissues of the body, and is released when the body reacts to a foreign substance (known as an allergen).This is often referred to as an 'itch-scratch-itch' cycle.