Phase III Clinical Study of Cetirizine Hydrochloride Injection in Treatment of Acute Urticaria

The subjects received a single dose of 1-2 ml of the injection of cetirizine hydrochloride (administered by intravenous push) and a 1 ml dose of the injection simulant of diphenhydramine hydrochloride (administered by deep intramuscular injection), both as a simulation of a single administration.

The subjects received 1 ml of the injection of Diphenhydramine Hydrochloride (for deep intramuscular injection) and 1 ml of the injection of Simulated Cetirizine Hydrochloride (administered by rapid intravenous injection over 1 to 2 minutes), each as a single dose.