This medication is an antihistamine which provides relief of allergy symptoms such as watery eyes, runny nose, itching eyes, sneezing, itching and hives. Take this medication by mouth once a day as directed. May be taken with or without food. Do not increase your dose or take this more often than directed.

Take ZYRTEC by mouth once a day as directed. May be taken with or without food. Do not increase your dose or take this more often than directed.

Drowsiness, sleepiness, dry mouth, fatigue, dizziness, increased appetite, and nausea may occur. These effects should subside as your body adjusts to the medication. If they continue or become bothersome, inform your doctor. Notify your doctor if you develop any of these serious effects while taking this medication: chest pain, rash, trouble breathing. This medication may cause dizziness or drowsiness. Use caution engaging in activities requiring alertness. If you notice other effects not listed above, contact your doctor or pharmacist.

Tell your doctor your medical history, especially of: liver or kidney disease, asthma, any blood disorders, any any allergies. This medication can increase sensitivity to sunlight. Avoid prolonged sun exposure. Wear protective clothing and a sunscreen when outdoors. Limit intake of alcohol to prevent excessive drowsiness. Tell your doctor if you are pregnant before taking this medication. This medication is excreted into human breast milk. Discuss the risks of breast-feeding with your doctor.

Tell your doctor of any over-the-counter and prescription medication you may take including: sedatives, tranquilizers, narcotic pain relievers, sleep medicine, drugs for anxiety, barbiturates (e.g., phenobarbital), psychiatric medicines, other antihistamines. Do not start or stop any medicine without doctor or pharmacist approval.

If you miss a dose, take it as soon as remembered; do not take it if it is near the time for the next dose, instead, skip the missed dose and resume your usual dosing schedule. Do not "double-up" the dose to catch up.

Store between 59 and 86 degrees F (15 to 30 degrees C) away from heat and light. Do not store in the bathroom.