Use Zyrtec as directed by your doctor. Check the label on the medicine for exact dosing instructions. * Take Zyrtec by mouth with or without food. * If you miss a dose of this medicine, take it as soon as possible. Possible side effects of Zyrtec: 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). Seek medical attention right away if any of these SEVERE side effects occur: * 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 http://www.allergyrxstore.com/zyrtec.php
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