ZYRTEC

Who is Zyrtec for ?

Cetirizine, an antihistamine, is used to relieve hay fever and seasonal allergy symptoms, including runny nose; sneezing; and red, itchy, tearing eyes. It also may be used to treat itching and hives that result from certain skin conditions. this medication is sometimes prescribed for other uses; ask your doctor or pharmacist for more information.

Cetirizine treats allergy symptoms by preventing histamine from binding to histamine (H1) receptors, thereby blocking the histamine reaction. Histamine is a substance in the body that stimulates the production of mucus and the dilation of blood vessels. Allergy sufferers recognize histamine's effects as a runny nose and swollen nasal passages.

When should I be careful taking Zyrtec ?

Before taking cetirizine,

• tell your doctor and pharmacist if you are allergic to cetirizine, hydroxyzine (Atarax, Vistaril), any other antihistamines, or any other drugs.
• tell your doctor and pharmacist what prescription and nonprescription medications you are taking, especially medications for allergy, seizures, pain, or sleep; muscle relaxants; narcotics; theophylline (Theo-Dur); and vitamins.
• tell your doctor if you have or have ever had kidney or liver disease.
• tell your doctor if you are pregnant, plan to become pregnant, or are breast-feeding. If you become pregnant while taking cetirizine, call your doctor.
• if you are having surgery, including dental surgery, tell the doctor or dentist that you are taking cetirizine.
• you should know that this drug may make you drowsy. Do not drive a car or operate machinery until you know how this drug affects you.
• remember that alcohol can add to the drowsiness caused by this drug.

Side Effects

Although side effects from cetirizine are not common, they can occur. Tell your doctor if any of these symptoms are severe or do not go away:

• dry mouth, nose, and throat
• drowsiness
• dizziness
• upset stomach

If you experience any of the following symptoms, call your doctor immediately:

• fast or irregular heartbeat
• difficulty urinating