- 10 Common Allergy Triggers Slideshow Pictures
- Take the Quiz on Allergies
- Nasal Allergy Relief Products Slideshow
- What is desloratadine, and how does it work (mechanism of action)?
- What brand names are available for desloratadine?
- Is desloratadine available as a generic drug?
- Do I need a prescription for desloratadine?
- What are the side effects of desloratadine?
- What is the dosage for desloratadine?
- Which drugs or supplements interact with desloratadine?
- Is desloratadine safe to take if I'm pregnant or breastfeeding?
- What else should I know about desloratadine?
What is desloratadine, and how does it work (mechanism of action)?
Desloratadine is an oral, long-acting antihistamine that is similar chemically to loratadine (Claritin). It is used to treat the symptoms caused by histamine. Histamine is a chemical that is responsible for many of the signs and symptoms of allergic reactions, for example, swelling of the lining of the nose, sneezing, and itchy eyes. Histamine is released from histamine-storing cells (mast cells) and then attaches to other cells that have receptors for histamine. The attachment of the histamine to the receptors causes the cells to be "activated," releasing other chemicals which produce the effects that we associate with allergy. Desloratadine blocks one type of receptor for histamine (the H1 receptor) and thus prevents activation of H1 receptor-containing cells by histamine. Desloratadine does not readily enter the brain from the blood and, therefore, causes less drowsiness (sedation). It is a member of a small family of non-sedating antihistamines which includes loratadine (Claritin), cetirizine (Zyrtec), fexofenadine (Allegra), and levocetirizine (Xyzal). Desloratadine was approved by the FDA in December 2001.
What are the side effects of desloratadine?
The most common side effects of desloratadine are:
Quick GuideBad Bugs: Identify Bug Bites From Mosquitos, Spiders and More
What is the dosage for desloratadine?
The recommended dose for adults and children 12 years or older is 5 mg daily.
For children 6 to 11 years of age the dose is 2.5 mg of the syrup or 2.5 mg of the RediTabs once daily.
Children 12 months to 5 years old should receive 1.25 mg of the syrup once daily and children 6 to 11 months old are treated with 1 mg of syrup once daily.
Desloratadine can be taken with or without food.
Which drugs or supplements interact with desloratadine?
Ketoconazole (Nizoral, Extina, Xolegel, Kuric), erythromycin, azithromycin (Zithromax), fluoxetine (Prozac), and cimetidine (Tagamet) increase blood levels of desloratadine by reducing the elimination of desloratadine by liver enzymes.
Is desloratadine safe to take if I'm pregnant or breastfeeding?
Desloratadine has not been studied in pregnant women.
Desloratadine passes into breast milk and should therefore be used with caution in women who are breastfeeding.
What else should I know about desloratadine?
What preparations of desloratadine are available?
Tablets: 5 mg. Orally Disintegrating (RediTabs): 2.5 and 5 mg. Syrup: 0.5 mg/1mL
How should I keep desloratadine stored?
Tablets and syrup should be stored at 25 C (77 F).
Desloratadine (Clarinex, Clarinex Reditabs) is a medication used to treat allergies and hives (chronic urticaria) in adults and children 12 years of age and older. Side effects, drug interactions, warnings and precautions, and patient safety information should be reviewed prior to taking any medication.
Multimedia: Slideshows, Images & Quizzes
Related Disease Conditions
Hives (Urticaria & Angioedema)
Hives, also called urticaria, is a raised, itchy area of skin that is usually a sign of an allergic reaction. The allergy may be...
Chronic Rhinitis and Post-Nasal Drip (Symptoms, Treatment)
Chronic rhinitis and post-nasal drip symptoms include an itchy, runny nose, sneezing, itchy ears, eyes, and throat. Seasonal...
An allergy refers to a misguided reaction by our immune system in response to bodily contact with certain foreign substances. ...
Hay Fever (Allergic Rhinitis)
Hay fever (allergic rhinitis) is an irritation of the nose caused by pollen and is associated with the following allergic...
Eye allergy (or allergic eye disease) are typically associated with hay fever and atopic dermatitis. Medications and cosmetics...
The allergic cascade refers to allergic reactions that happen in the body in response to allergens. A variety of immune cells and...
Treatment & Diagnosis
- Drugs: Buying Prescription Drugs Online Safely
- Medication Disposal
- Dangers of Mixing Medications
- How To Reduce Your Medication Costs
- Pharmacy Visit, How To Get The Most Out of Your Visit
- Indications for Drugs: Approved vs. Non-approved
- Drugs: The Most Common Medication Errors
- Generic Drugs, Are They as Good as Brand-Names?
Medications & Supplements
Prevention & Wellness
Report Problems to the Food and Drug Administration
You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.
Top desloratadine Related Articles
Allergic CascadeThe allergic cascade refers to allergic reactions that happen in the body in response to allergens. A variety of immune cells and chemical messengers participate in the allergic cascade. Symptoms of the allergic cascade range from mild swelling and itching to full-blown anaphylactic shock. Allergen avoidance and medications are used to prevent or treat allergies.
AllergyAn allergy refers to a misguided reaction by our immune system in response to bodily contact with certain foreign substances. When these allergens come in contact with the body, it causes the immune system to develop an allergic reaction in people who are allergic to it. It is estimated that 50 million North Americans are affected by allergic conditions. The parts of the body that are prone to react to allergies include the eyes, nose, lungs, skin, and stomach. Common allergic disorders include hay fever, asthma, allergic eyes, allergic eczema, hives, and allergic shock.
antihistamines-oralOral antihistamines are medications used to treat symptoms of congestion, runny nose, the common cold, sneezing, itchy throat, skin rashes, hives, itching, and watery or itchy eyes. Some antihistamines also are used to treat anxiety, insomnia, and motion sickness. Side effects, drug interactions, dosing, storage, and pregnancy and breastfeeding safety information should be reviewed prior to taking this class of medication.
Chronic rhinitis and post-nasal drip symptoms include an itchy, runny nose, sneezing, itchy ears, eyes, and throat. Seasonal allergic rhinitis (also called hay fever) usually is caused by pollen in the air. Perennial allergic rhinitis is a type of chronic rhinitis and is a year-round problem, often caused by indoor allergens, such as dust, animal dander, and pollens that may exist at the time. Treatment of chronic rhinitis and post nasal drip are dependent upon the type of rhinitis condition.
Drug InteractionsDrug interactions occur frequently. Get facts about the types of drug interactions, what substances or other things that may interact with drugs such as OTC drug and prescription drugs, vitamins, food(s) (grapefruit), and laboratory tests. Find out how to protect yourself from potential drug interactions.
Eye AllergyEye allergy (or allergic eye disease) are typically associated with hay fever and atopic dermatitis. Medications and cosmetics may cause eye allergies. Allergic eye conditions include allergic conjunctivitis, conjunctivitis with atopic dermatitis, vernal keratoconjunctivitis, and giant papillary conjunctivitis. Dry eye, tear-duct obstruction, and conjunctivitis due to infection are frequently confused with eye allergies. Eye allergies may be treated with topical antihistamines, decongestants, topical mast-cell stabilizers, topical anti-inflammatory drugs, systemic medications, and allergy shots.
Hay FeverHay fever (allergic rhinitis) is an irritation of the nose caused by pollen and is associated with the following allergic symptoms: nasal congestion, runny nose, sneezing, eye and nose itching, and tearing eyes. Avoidance of known allergens is the recommended treatment, but if this is not possible, antihistamines, decongestants, and nasal sprays may help alleviate symptoms.
HivesHives, also called urticaria, is a raised, itchy area of skin that is usually a sign of an allergic reaction. The allergy may be to food or medications, but usually the cause of the allergy (the allergen) is unknown.
Nasal Allergy MedicationsNasal allergy medications are used to relieve itching, sneezing, and nasal swelling associated with allergies. Antihistamines, decongestants, and steroids are different types of nasal allergy medications. Possible side effects of these medications include dryness, stuffiness, burning, bleeding, nervousness, and palpitations.
Urticaria PictureThis is a close-up view of wheals with white-to-light-pink color centrally and peripheral erythema. See a picture of Urticaria and learn more about the health topic.