If the patient is found to be allergic to penicillin injection, the treatment measures are as follows: 1. The injection of penicillin must be stopped immediately, including the rehydration solution in the infusion set discarded, and then replaced with saline drip. 2. The patient should be given a flat lie, given oxygen, cardiac monitoring, and closely observe the vital signs. 3. Anti-allergic drugs should be applied immediately, such as dexamethasone intravenously, which has anti-inflammatory, anti-allergic, and anti-shock effects. The effect of dexamethasone is anti-inflammatory, anti-allergic, and anti-shock. If the patient’s heart rate accelerates and blood pressure decreases, there is a possibility of anaphylaxis, which can be treated with epinephrine, usually with epinephrine 0.5mg intramuscular injection, and also rapid rehydration.