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-D (loratadine with pseudoephedrine) is used to treat seasonal allergies and relieve nasal congestion and sinus pressure. It is a combination of an antihistamine with the same active ingredient as Sudafed. Detailed dosage guidelines and administration information for Claritin (loratadine). Includes dose adjustments, warnings and precautions. Doctors give trusted answers on uses, effects, side-effects, and cautions: Dr. Menchell on can i take claritin and dayquil: DayQuil contains PHENYLEPHRINE a DECONGESTION similar to SUDAPHED! Rapid heart beat and a number of other symptoms are possible! Hope this helps! Dr Z What is Claritin? Loratadine—also known by its brand name, Claritin—belongs to a group of medications known as antihistamines. It reduces the effect of a natural chemical in the body called histamine; this chemical can cause an array of symptoms like runny nose, itchy eyes, sneezing, rashes and more. Doctors help those with Peanut Allergy who are concerned about Allergies: Dr. Goldman on class 2 peanut allergy: Allergic reactions varies with individuals.Some can consume cashews, while to others they are toxic.Reactions can be mild or severe. Mild reactions include nausea , vomiting, diarrhea. Skin rash and itching on the skin.The eyes. COMMON BRAND NAMES. Alavert, Allergy Relief, Claritin, Claritin Chewable, Claritin Liqui-Gel, Claritin RediTab, Claritin-D 24 Hour, Clear-Atadine, Dimetapp Children's Non-Drowsy Allergy, QlearQuil All Day & All Night Allergy Relief, Tavist ND Loratadine, sold under the brand names Claritin and Claritin-D (which contains loratadine plus pseudoephedrine), is an over-the-counter antihistamine medication. Noun: 1. clarity - free from obscurity and easy to understand; the comprehensibility of clear expression Compare prices and find coupons for Claritin (Loratadine) at more than 60,000 US pharmacies. Save up to 80% instantly!.