Zyrtec
Key points
- ZYRTEC reg; is an antihistamine that helps to relieve allergy symptoms such as runny nose, red, itchy eyes and sneezing.
- Zyrtec is prescribed to treat the sneezing; itchy, runny nose; and itchy, red, watery eyes caused by seasonal allergies such as hay fever.
- Take Zyrtec by mouth usually twice daily with or without food; or as directed by your doctor.
- Drowsiness, dizziness, nervousness, nausea, headache, dry mouth, or unusual tiredness or weakness (fatigue) may occur.
ZYRTEC reg; is an antihistamine that helps to relieve allergy symptoms such as runny nose, red, itchy eyes and sneezing. Zyrtec works by blocking the effects of histamines. Zyrtec has received high marks for customer satisfaction in recent surveys.
Zyrtec Usage
Zyrtec is prescribed to treat the sneezing; itchy, runny nose; and itchy, red, watery eyes caused by seasonal allergies such as hay fever. Zyrtec also relieves the symptoms of year-round allergies due to dust, mold, and animal dander. Zyrtec is also used in the treatment of chronic itchy skin and hives.
How To Take Zyrtec
Take Zyrtec by mouth usually twice daily with or without food; or as directed by your doctor. Zyrtec must be swallowed whole. Do not crush or chew the tablets. Zyrtec is not recommended for use in children under 12 years of age.
Zyrtec Side Effects
Drowsiness, dizziness, nervousness, nausea, headache, dry mouth, or unusual tiredness or weakness (fatigue) may occur. If any of these effects persist or worsen, notify your doctor. Tell your doctor immediately if any of these serious side effects occurs: irregular heartbeat, unusually fast heartbeat, uncontrolled muscle movements (tremor), rash, chest pain, trouble sleeping. Tell your doctor immediately if any of these unlikely but serious side effects occur: mental/mood changes, seizures, trouble breathing, trouble urinating, vision problems. If you notice other effects not listed above, contact your doctor or pharmacist.
Precautions for Zyrtec
Zyrtec is not recommended for use if you have the following medical conditions: glaucoma (narrow-angle type), problems urinating (e.g., enlarged prostate), severe high blood pressure, severe heart/blood vessel disease (coronary artery disease), any problems taking decongestants (e.g., symptoms include trouble sleeping, dizziness, weakness, tremor, or irregular heartbeat). Tell your doctor your medical history, especially of: kidney problems, liver problems, asthma, high blood pressure, diabetes, heart disease, thyroid problems, any allergies. Zyrtec may make you dizzy or drowsy; use caution engaging in activities requiring alertness such as driving or using machinery. Limit alcoholic beverages. Caution is advised when using Zyrtec in the elderly because they may be more sensitive to the effects of the drug. Zyrtec should be used only when clearly needed during pregnancy. Zyrtec passes into breast milk. Discuss the risks and benefits with your doctor.
Zyrtec Interactions
Written and revised by
Gerald Hurowitz, M.D.
Our doctors write and review articles for accuracy and keep them up to date.
health.am provides general information, not medical advice. Always consult a qualified health professional about your own health.

