They are microscopic mites that live in the fibers of pillows, mattresses, blankets and carpet. The pseudoephedrine in Claritin-D is a decongestant that shrinks blood vessels in the nasal passages. Claritin on its own, due to its antihistamine effects, should be helping to treat certain cold symptoms such as a runny nose and watery eyes as well. Claritin (loratadine) is an antihistamine that reduces the effects of natural chemical histamine in the body. An exaggerated response of the immune system to a substance that is ordinarily harmless. An exaggerated response of the immune system to a substance that is ordinarily harmless. 1. Do not use Claritin-D 24 Hour if you have used an Do not use Claritin-D 24 Hour if you have used an MAO inhibitor in the past 14 days. Pseudoephedrine, which Claritin-D® contains, is an active ingredient that effectively relieves tough nasal congestion. For the most part, you can take any cold medication you want while on Claritin, with the exception of other antihistamines. Version: 11.01.Use these dosage charts for infants and children under 12 years old:The easiest way to lookup drug information, identify pills, check interactions and set up your own personal medication records. Inhalation of their droppings can cause allergic reactions such as runny nose, sneezing and nasal congestion. We comply with the HONcode standard for trustworthy health information - Allergy symptoms can last weeks or months, and will be present as long as you are exposed to the allergen. Avoid driving or hazardous activity until you know how this medicine will affect you.Drinking alcohol can increase certain side effects of this medication.Ask a doctor or pharmacist before using other cough or cold medicines that may contain similar ingredients.Stop using this medicine and call your doctor at once if you have:pounding heartbeats or fluttering in your chest; orThis is not a complete list of side effects and others may occur. Claritin-D is used to treat sneezing, runny or stuffy nose, itchy or watery eyes, hives, skin rash, itching, and other symptoms of allergies and the common cold. A chronic disease characterized by an overreaction of the immune system to certain allergens commonly found outside, such as tree, grass, or weed pollens,or mold spores. They live off of our dead skin cells. Select one or more newsletters to continue. Starts working on allergies with nasal congestion in as little as 30 minutes.Tackles nasal congestion due to allergies or a cold and also relieves sinus congestion and pressure due to allergies.Relieves symptoms without drowsiness, so you can make the most of your day.This powerful tablet relieves common allergy symptoms such as sneezing, runny nose, itchy, watery eyes and itchy nose or throat, plus sinus congestion...One dose relieves common allergy symptoms such as sneezing, runny nose, itchy, watery eyes and itchy nose or throat, plus sinus congestion & press...Feel better faster with the leading adult multi-symptom allergy product.Find mom-approved tips for managing children’s allergy symptoms.Get allergy relief with savings on your favorite Claritin® products.Comparison based on selected attributes. A dangerous drug interaction could occur. But you can often tell the difference by looking at the color and texture of your mucus. Always remember to read the label.Allegra®, Zyrtec®, Benadryl® and Xyzal® are trademarks of their respective owners.Comparison based on selected attributes. Claritin-D 24 Hour is a combination medicine used to treat sneezing, runny or stuffy nose, sinus pain, itchy or watery eyes or nose, and other symptoms of allergies and the common cold.. Claritin-D 24 Hour may also be used for purposes not listed in this medication guide.