over the counter antihistamin

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Over the counter antihistamine work by blocking the effect of histamine (a substance produced by specialized mast cells) which plays a significant role in the body’s immune system.over the counter antihistamin

What are over the counter antihistamine?

 Over the counter antihistamine is a group of drugs that are used to treat the symptoms of a variety of medical conditions, most often allergies.

However, in those who have developed an allergy, histamine may also be released in response to usually harmless substances like grass and tree pollen, house dust, animal dander (particles of skin or hair), or foods such as eggs and shellfish.

Are there side effects with over the counter antihistamine?

In the past, many oral antihistamines caused drowsiness, and care had to be taken when driving or operating machinery. A dry mouth and blurred vision were also associated with these drugs.Over The Counter Antihistamine non drowsy

A new range of antihistamines, including terfenadine, cetirizine, and Lori-dine have now significantly reduced these problems. Nose drops, nasal sprays, and eye drops are also relatively free of side effects.

Some of the consequences of histamine are

Widen small blood vessels, causing redness of the skin.

Cause leakage of fluid from the bloodstream, resulting in tissue swelling.

Irritated nerve endings to cause itching.

The release of histamine causes certain tissues to become inflamed. The symptoms which result from an allergic reaction depend on which tissues become infected and the severity of the reaction.

There may be a mild reaction, like hay fever (allergic rhinitis), where the lining of the eyes and nose become sore and itchy, or in a skin allergy, such as urticaria (nettle rash) where the skin develops wells and itches.

There may even be a severe reaction causing inflammation of the airways in

the lungs and swelling of the tongue. Severe reactions such as this (called anaphylactic shock) may occur with allergies to drugs or insect stings and can be fatal.

By blocking the action of histamine, antihistamines reduce the severity of the allergic reaction.

How are antihistamines taken?

There are a variety of antihistamine preparations, used to treat allergic reactions in different parts of the body, as there are a variety of allergic reactions. For example, there are anti-histamine eye drops, nasal sprays, and tablets, each used for the treatment of allergy symptoms.over the counter antihistamine cream

Antihistamines can either be taken before coming into contact with the allergy-producing substance, to prevent the reaction from happening, or they may

be taken during the allergic response to reduce the severity. Injections may be used for emergency treatment of severe reactions, such as anaphylactic shock.

Are there any other uses for antihistamines?

Their anti-itching effect means antihistamines may be utilized, by mouth, in the treatment of mild skin irritations.

They are also commonly used to prevent travel sickness because an effect of antihistamines is to suppress nausea and vomiting. (It is the anti-histamines in some travel sickness tablets that can make you feel drowsy.)

Their mild sedative effect means they are occasionally used as a sleeping drug to treat insomnia, especially in children. Antihistamines also suppress the cough reflex

and dry up nasal secretions and so may be found in a cough and cold remedies.

A particular type of antihistamine can reduce acid production in the stomach, and so is useful in treating peptic ulcers.Non Drowsy Antihistamine

What can I do myself?

Some antihistamines may be bought at the chemists without a prescription. Even if you do not suffer from an allergy, you can keep some at home in the medicine cabinet for stings or rashes.

If you do suffer from a mild allergy, you should try to treat yourself with these preparations before seeing a doctor. Do not use antihistamine creams on severe skin disorders without medical advice.

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When should I see my doctor?

If you think that you have developed an allergy and a day or two

of antihistamines have made no difference, consult a doctor. However, if you believe that either you or someone else is suffering from a severe allergic reaction, particularly if it is causing breathing difficulty or collapse, call a doctor or ambulance immediately.

H1 AND H2-RECEPTOR ANTAGONISTS

The cells of certain tissues, like the small blood vessels in the skin, nose, and eyes, have specialized receptors for histamine, known as Hi-receptors.over the counter antihistamine for food allergy

Certain antihistamines called H.-receptor antagonists, block these receptors, so preventing the histamine from taking effect.

Histamine also acts via H2 receptors antagonists can block

their effect, so relieving conditions such as peptic ulcer and esophagitis.

EFFECT OF ANTIHISTAMINES

Eyes: Reduce inflammation and irritation.

Nose: Reduce irritation and dry up mucus.

Skin: Reduce inflammation, irritation, and swelling.

Brain: Mild sedative effect. Suppress coughing and vomiting mechanism.

Lungs: Prevent narrowing of airways, which otherwise occurs with abnormal release of histamine but not helpful in treating asthma.

How to use over the counter antihistamine?

There are a variety of antihistamine preparations, used to treat

allergic reactions in different parts of the body, as there are a variety of allergic reactions. For example, there are anti-histamine eye drops, nasal sprays, and tablets, each used for the treatment of allergy symptoms.

Antihistamines can either be taken before coming into contact with the allergy-producing substance, to prevent the reaction from happening, or they may be taken during the allergic reaction to reduce the severity. Injections may be used for emergency treatment of severe reactions, such as anaphylactic shock.over the counter antihistamine for rash

WARNING

If you are taking antihistamines does not drive or operate machineryOver the counter antihistamine

Oral: Chlorpheniramine, terfenadine, astemizole, loratadine, cetirizine.

Nasal drop or sprays: Xylometazoline.

Eye drops Antazoline.

ANTAGONISTS the histamine from taking effect. Histamine also acts via Fir receptors on cells in the acid-producing glands in the stomach lining. Hz-receptor antagonists can block their effect, so relieving conditions such as peptic ulcer and esophagitis.

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