DOSING: Cetirizine should be taken at doses specifically directed by a physician. Cetirizine can be taken with food.
Avoid drinking alcohol. It can increase some of the side effects of cetirizine.
DRUG INTERACTIONS: Cetirizine should be taken only in doses prescribed. Increasing the dose can be dangerous. When taking cetirizine with theophylline the dose of theophylline may need to be reduced. Cetirizine occasionally can cause sleepiness . Cetirizine can be taken with erythromycin or ketaconazole without the increased risk of heart irregularities common to other non-sedating antihistamines. Cetirizine also can be used to treat children.
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