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When administered concomitantly with alcohol, Loratadine has no potentiating effects as measured by psychomotor performance studies. Increase in plasma concentrations of Loratadine has been reported after concomitant use with Ketoconazole, Erythromycin or Cimetidine in controlled clinical trials, but without clinically significant changes (including electrocardiographic). Other drugs known to inhibit hepatic metabolism should be co-administered with caution until definitive interaction studies can be completed.
Drug/Laboratory test interaction: Loratadine products should be discontinued approximately 48 hours prior to skin testing procedures since antihistamines may prevent or diminish otherwise positive reactions to dermal reactivity indicators.
