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Due to the pharmacokinetic, pharmacodynamic, and tolerance profile of Cetirizine, no interactions are expected with this antihistamine. Neither pharmacodynamic nor significant pharmacokinetic interaction was reported in drug-drug interaction studies performed, notably with Pseudoephedrine or Theophylline (400 mg/day).
Alcohol and other CNS depressants: In sensitive patients, the concurrent use of alcohol or other CNS depressants may cause additional reductions in alertness and impairment of performance, although Cetirizine does not potentiate the effect of alcohol (0.5 g/L blood levels) (see Precautions).
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