What happens when you have allergy

Generic Name:loratadine (lor AT a deen)
Brand Names:Alavert, Claritin, Claritin Reditab, Clear-Atadine, Dimetapp ND, ohm Allergy Relief, QlearQuil Every Day & Night, Tavist ND, Wal-itin

Medically reviewed by Sophia Entringer, PharmD Final updated on Jan 31, 2019.

What happens when you own allergy


Main allergy symptoms

Common symptoms of an allergic reaction include:

  1. sneezing and an itchy, runny or blocked nose (allergic rhinitis)
  2. swollen lips, tongue, eyes or face
  3. itchy, red, watering eyes (conjunctivitis)
  4. tummy pain, feeling ill, vomiting or diarrhoea
  5. wheezing, chest tightness, shortness of breath and a cough
  6. a raised, itchy, red rash (hives)
  7. dry, red and cracked skin

The symptoms vary depending on what you’re allergic to and how you come into contact with it.

For example, you may have a runny nose if exposed to pollen, develop a rash if you own a skin allergy, or feel sick if you eat something you’re allergic to.

See your GP if you or your kid might own had an allergic reaction to something.

What happens when you own allergy

They can assist determine whether the symptoms are caused by an allergy or another condition.

Read more about diagnosing allergies.


Important information

You should not take Claritin if you are allergic to loratadine or to desloratadine (Clarinex).

Follow every directions on your medicine label and package. Tell each of your healthcare providers about every your medical conditions, allergies, and every medicines you use.

Some chewable dosage forms of loratadine may contain phenylalanine.

What happens when you own allergy

Talk to your doctor before using this form of Claritin if you own phenylketonuria (PKU).

Ask a doctor or pharmacist before taking this medicine if you own liver or kidney disease.


Severe allergic reaction (anaphylaxis)

In rare cases, an allergy can lead to a severe allergic reaction, called anaphylaxis or anaphylactic shock, which can be life threatening.

This affects the whole body and usually develops within minutes of exposure to something you’re allergic to.

Signs of anaphylaxis include any of the symptoms above, as well as:

Anaphylaxis is a medical emergency that requires immediate treatment.

Read more about anaphylaxis for information about what to do if it occurs.

Sheet final reviewed: 22 November 2018
Next review due: 22 November 2021

What is an allergy blood test?

Allergies are a common and chronic condition that involves the body’s immune system.

Normally, your immune system works to fight off viruses, bacteria, and other infectious agents.

What happens when you own allergy

When you own an allergy, your immune system treats a harmless substance, love dust or pollen, as a threat. To fight this perceived threat, your immune system makes antibodies called immunoglobulin E (IgE).

Substances that cause an allergic reaction are called allergens. Besides dust and pollen, other common allergens include animal dander, foods, including nuts and shellfish, and certain medicines, such as penicillin. Allergy symptoms can range from sneezing and a stuffy nose to a life-threatening complication called anaphylactic shock.

What happens when you own allergy

Allergy blood tests measure the quantity of IgE antibodies in the blood. A little quantity of IgE antibodies is normal.

What happens when you own allergy

A larger quantity of IgE may mean you own an allergy.

Other names: IgE allergy test, Quantitative IgE, Immunoglobulin E, Entire IgE, Specific IgE


What is Claritin?

Claritin (loratadine) is an antihistamine that reduces the effects of natural chemical histamine in the body. Histamine can produce symptoms of sneezing, itching, watery eyes, and runny nose.

Claritin is used to treat sneezing, runny nose, watery eyes, hives, skin rash, itching, and other freezing or allergy symptoms.

Claritin is also used to treat skin hives and itching in people with chronic skin reactions.


Before taking this medicine

You should not take Claritin if you are allergic to loratadine or to desloratadine (Clarinex).

Ask a doctor or pharmacist if it is safe for you to use this medicine if you own other medical conditions, especially:

  1. asthma;

  2. kidney disease; or

  3. liver disease.

Claritin is not expected to harm an unborn baby.

What happens when you own allergy

Tell your doctor if you are pregnant or plan to become pregnant.

Loratadine can pass into breast milk, but is considered compatible with breastfeeding. Tell your doctor if you are breast-feeding a baby.


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What happens when you have allergy