Anti-Allergic/Asthma

All medicines may cause side effects, but many people have no, or minor, side effects. Check with your doctor if any of these most COMMON side effects persist or become bothersome:

• Drowsiness; dry mouth; stomach pain (in children); tiredness; trouble sleeping (in children).

• Severe allergic reactions (rash; hives; itching; difficulty breathing; tightness in the chest; swelling of the mouth, face, lips, or tongue; unusual hoarseness); dark urine; fainting; fast or irregular heartbeat; mental or mood changes; persistent fatigue; seizures; severe dizziness; unusual bruising or bleeding; yellowing of eyes or skin.

Zyrtec may cause drowsiness. These effects may be worse if you take it with alcohol or certain medicines. Use Zyrtec with caution. Do not drive or perform other possibly unsafe tasks until you know how you react to it.
Do not drink alcohol or use medicines that may cause drowsiness (eg, sleep aids, muscle relaxers) while you are using Zyrtec ; it may add to their effects. Ask your pharmacist if you have questions about which medicines may cause drowsiness.
Zyrtec may cause you to become sunburned more easily. Avoid the sun, sunlamps, or tanning booths until you know how you react to Zyrtec . Use a sunscreen or wear protective clothing if you must be outside for more than a short time.
Use Zyrtec with caution in the ELDERLY; they may be more sensitive to its effects, especially drowsiness.
Caution is advised when using Zyrtec in CHILDREN; they may be more sensitive to its effects, especially stomach pain and trouble sleeping. Zyrtec should be used with extreme caution in CHILDREN younger than 6 months old; safety and effectiveness in these children have not been confirmed.
PREGNANCY and BREAST-FEEDING: If you become pregnant, contact your doctor. You will need to discuss the benefits and risks of using Zyrtec while you are pregnant. Zyrtec is found in breast milk. Do not breast-feed while taking Zyrtec .