Adding a Short Burst of Corticosteroid to the Conventional Treatment of H1 Antihistamines in Emergency Department.

The patients would be random into 3 groups. The randomization process would already be prepared into 3 groups with a number coding by the statistician who doesn't get involve in the rest of experiment. The drugs would be in the 3 group of sealed envelopes which have 3 kinds of drug combination After the envelopes are sealed, it will be code in an order of number. Experiment 1 and Experiment 2 groups would receive IV Dexamethasone in emergency department (ED).

The patients would be random into 3 groups. The randomization process would already be prepared into 3 groups with a number coding by the statistician who doesn't get involve in the rest of experiment. The drugs would be in the 3 group of sealed envelopes which have 3 kinds of drug combination After the envelopes are sealed, it will be code in an order of number. Experiment 2 groups would receive IV Dexamethasone in ED and Oral prednisolone as home medication.