Antihistamines for Allergy Relief

Antihistamines are drugs that treat allergic symptoms by blocking the action of histamine, a substance in the body that causes allergic reactions.
Category
Drug
Where to get
Over-the-counter or prescription; available in pharmacies as pills, liquids, or nasal sprays.
Function
Histamine Blocker
Prepared by Lee Cheng, reviewed by Dr. Helena Rodriguez

Antihistamines FAQ


Image credit: walmart.com

What does antihistamine mean?

An antihistamine is a prescription or over-the-counter medication that blocks some of what histamine does. “Anti” means against, so antihistamines are medicines that work against or block histamine. How are antihistamines classified? Antihistamines are divided into two major subtypes.

What are antihistamines used for?

Antihistamines are medicines often used to relieve symptoms of allergies, such as hay fever, hives, conjunctivitis and reactions to insect bites or stings. They're also sometimes used to prevent motion sickness, to treat feeling sick (nausea) or being sick ( vomiting ), and as a short-term treatment for insomnia.

What are the two largest classes of antihistamines?

The two largest classes of antihistamines are H 1 -antihistamines and H 2 -antihistamines . H 1 -antihistamines work by binding to histamine H 1 receptors in mast cells, smooth muscle, and endothelium in the body as well as in the tuberomammillary nucleus in the brain.

How do Antihistamines work?

Antihistamines block the effects of a substance called histamine in your body. Histamine is normally released when your body detects something harmful, such as an infection. It causes blood vessels to expand and the skin to swell, which helps protect the body.

How do antihistamines affect the body?

Once histamines bind to these receptors, they trigger several typical allergic reactions, such as expanding the blood vessels and causing the smooth muscle tissues to contract. Antihistamines refer to a type of medication that treats allergy symptoms, motion sickness, and some cold and flu symptoms.

Are antihistamines effective?

For example: In general, antihistamines are probably roughly equally effective in reducing the symptoms of hay fever (seasonal allergic rhinitis) and hives (urticaria). However, non-sedating antihistamines tend to be used more commonly as they cause less drowsiness.

Can antihistamines cause allergic reactions?

The histamine causes an allergic reaction with unpleasant symptoms including itchy, watering eyes, a running or blocked nose, sneezing and skin rashes. Antihistamines help stop this happening if you take them before you come into contact with the substance you're allergic to.

Antihistamines References

If you want to know more about Antihistamines, consider exploring links below:

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