CETIRIZINE (se TI ra zeen) prevents and treats allergy symptoms, such as red, itchy eyes, sneezing, a runny or stuffy nose, or hives. It works by blocking histamine, a substance released by the body during an allergic reaction. It belongs to a group of medications called antihistamines.

Perennial Allergic Rhinitis: ZYRTEC is indicated for the relief of symptoms associated with perennial allergic rhinitis due to allergens such as dust mites, animal dander and molds in adults and children 6 months of age and older.

However it's best to take cetirizine only for as long as you need to. If you take it regularly over a long period there's a very small chance of severe itching if you stop treatment suddenly. If you've been taking cetirizine every day for a long time, talk to your doctor before stopping it.

Corticosteroid nasal sprays. These medications improve nasal symptoms. Examples include fluticasone propionate (Flonase Allergy Relief), budesonide (Rhinocort Allergy) and triamcinolone (Nasacort Allergy 24 Hour). Talk to your health care provider about long-term use of corticosteroid nasal sprays.

It's generally safe to take the newer generation of antihistamines daily if you have year-round allergy symptoms.

Claritin (loratadine) and Zyrtec (cetirizine hydrochloride) are antihistamines used to treat allergy symptoms such as itching, sneezing, runny nose, and allergic skin rashes. Both Claritin and Zyrtec are available over-the-counter (OTC) and as generics.

It's generally safe to take the newer generation of antihistamines daily if you have year-round allergy symptoms.

Claritin and Zyrtec are popular over-the-counter antihistamines. Doctors consider them safe and effective treatments for minor allergies. Both are second-generation antihistamines. These cause less drowsiness than first-generation antihistamines.

It's generally safe to take the newer generation of antihistamines daily if you have year-round allergy symptoms. But make sure to avoid anything that has a "D" in its brand name, which stands for decongestants. Long-term use of decongestants will worsen your allergy symptoms.

Depending on your symptoms, you can take antihistamines: Every day, to help keep daily symptoms under control. Only when you have symptoms. Before being exposed to things that often cause your allergy symptoms, such as a pet or certain plants.

ZYRTEC® relieves your worst indoor and outdoor allergy symptoms. Common indoor allergens include dust mites, pet dander and mold. Outdoor allergens, depending on the season and your location, include grass pollen, tree pollen and mold.

Many people use antihistamines to treat allergy symptoms. Zyrtec (cetirizine) and Claritin (loratidine) are two popular brands. They contain different compounds but appear to be equally effective. Antihistamines can reduce allergy symptoms, such as watering eyes, itchy skin, hives, and swelling.

Cetirizine can be taken at any time of the day. In most people it is non-sedating, so they take it in the morning. However, a percentage of people do find it to be sedating so if it does make you drowsy it is best to take it in the evening. Cetirizine can be taken with or without food.

The maximum recommended daily dose is 20 mg, do not exceed this dose, unless told to do so by your doctor. The usual dose of ZYRTEC oral solution is 10 mL, once a day. In children over 6 years of age, the daily dose of 10 mg is given as a single or divided dose.

Zyrtec is used in adults and children to treat cold or allergy symptoms such as sneezing, itching, watery eyes, or runny nose. Zyrtec is also used to treat itching and swelling caused by chronic urticaria (hives). Zyrtec is an antihistamine that reduces the effects of natural chemical histamine in the body.

“While antihistamines won't stop the eczema flare-ups from happening, they will help to relieve some of the itchiness, and itchiness is the No. 1 complaint I hear from my patients with eczema,” says Debra Wattenberg, MD, a dermatologist in private practice in New York City.