All about allergy

The choice of medication and how it is given depends on the severity of the reaction.
Epinephrine
This drug is given only in very severe reactions (anaphylaxis).
Epinephrine is injected and acts as a bronchodilator (dilates the breathing tubes).
It also constricts the blood vessels, increasing blood pressure.
Another medication with similar effects may be given instead.
For a less severe reaction involving the respiratory tract, an inhaled epinephrine bronchodilator may be used, as in asthma.
Diphenhydramine (Benadryl)
This drug reverses the actions of histamine.
Diphenhydramine is injected when quick action is required.
It may be given by mouth for a less severe reaction. 
Corticosteroid
One of this group of drugs is usually given IV at first for rapid reversal of the effects of the mediators.
These drugs should not be confused with the steroids taken by athletes to build muscle and strength.
These drugs reduce swelling and many other symptoms of allergic reactions.
You may need to take an oral corticosteroid for several days after this.
Oral corticosteroids are often given for less severe reactions.
A corticosteroid cream or ointment may be used for skin reactions.
Other medications may be given as needed.

Allergy journal

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