How to use Zyrtec. If you are taking the over-the-counter product to self-treat, read all directions on the product package before taking this medication. Summary. Drug interactions are reported among people who take Claritin and Zyrtec together. This study is created by eHealthMe based on reports of 2,051 people who take Claritin and Zyrtec from FDA, and is updated regularly. Learn about Claritin (Loratadine) may treat, uses, dosage, side effects, drug interactions, warnings, patient labeling, reviews, and related medications. WebMD provides information about common drug or vitamin interactions for Zyrtec Oral. Brand names for Cetirizine include Zyrtec, Zyrtec Allergy, and Zyrtec Hives Relief. Brand names for loratadine include Claritin , Claritin RediTabs, Alavert , Claritin Hives Relief, Children's Claritin, and others. Claritin (loratadine) and Zyrtec (cetirizine hydrochloride) are antihistamines used to treat allergy symptoms, such as itching, runny nose, watery eyes, and sneezing from hay fever (allergic rhinitis) and other allergies, such as allergies to molds and dust mites. Zyrtec Drug Interactions Explained The following sections explain in detail the potentially negative interactions that can occur when Zyrtec is combined with any of the drugs listed above. Nous voudrions effectuer une description ici mais le site que vous consultez ne nous en laisse pas la possibilité. Zyrtec is the brand name of cetirizine, an over-the-counter (OTC) antihistamine used to treat cold and allergy symptoms such as sneezing, itching, watery eyes, or runny nose. Doctors give trusted answers on uses, effects, side-effects, and cautions: Dr. Lanier on zyrtec claritin interaction: But both work in a similar fashion to block histamine.