They are also added to medicines to treat coughs and colds.Antihistamines work by blocking the effect of histamine in your body.Some people find certain types work well for them and others do not.You may need to try more than one type to find one that works for you.Non-drowsy antihistamines are generally the best option, as they're less likely to make you feel sleepy.But types that make you feel sleepy may be better if your symptoms affect your sleep.If you have an adrenaline device – such as an Epipen® – you or a trained individual need to inject it and seek immediate medical help.
If you have a severe allergic reaction, your symptoms may include: This type of severe reaction is called anaphylaxis. Anaphylaxis is commonly triggered by an allergy to wasp and bee stings, latex, and certain foods, including eggs, fish, shellfish, cow’s milk and nuts. If you have anaphylaxis, it’s important that you get medical help immediately, as it can be very serious and you need an adrenaline injection.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.Many people find the worst symptom of their eczema is severe itching.Scratching relieves the itch, but also makes the inflammation and the itching worse because it causes more inflammatory substances to be released within the skin. Antihistamines have muscle-tightening properties that can prevent incontinence and manage conditions like irritable bowel syndrome. They can help ease nausea (including in travel sickness) and vertigo, relieve asthma and aid sleep.Most antihistamines can be bought from pharmacies and shops, but some are only available on prescription.This page covers: Types of antihistamines How to take them Side effects Taking them with other medicines, food or alcohol Who can take them – including pregnancy advice How they work There are many types of antihistamine.Bender, Ph D, of National Jewish Medical and Research Center in Denver."The first-generation antihistamines are more sedating, but the distinction isn't as black-and-white as the marketing of the newer products may lead you to believe.Most of the studies reviewed used doses that were twice the recommended amount -- 50 milligrams -- of diphenhydramine, the active ingredient in Benadryl and other first-generation "sedating" allergy medications."We're not saying that there's not a difference," says lead researcher Bruce G.The difference between them is really blurred." "Under some circumstances, the nonsedating formulas do cause sedation and in some cases, these sedating formulas do not," he tells Web MD.