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Concomitant use of Levocetirizine and CNS suppressants or alcohol (Ethyl) may enhance the CNS suppressant effect. Concomitant use should be avoided.
Concomitant use of Levocetirizine and ritonavir may result in increased exposure of Levocetirine.
Concomitant use of Levocetirizine and theophylline may decrease in the clearance of cetirizine.
