A 10-year-old girl was admitted to the ER because of generalized urticaria and difficulty in breathing. The symptoms occurred after she was stung by a bee. At the admission it was stated: disseminated urticaria on the skin, symptoms of wheezing on auscultation, breath rate 56/min, heart rate 110/min, RR 75/50 mmHg. Which of the following variants of therapeutic treatment is correct?