It usually takes 6 months or more of injections before you start feeling better and notice relief of your allergy symptoms. If you don't feel better after this time, you should probably talk with your doctor about another kind of treatment for your allergies. Safety Allergy injections are usually safe. But because allergy injections contain small amounts of the allergen you're allergic to, you might have an allergic reaction to the shot itself. One kind of allergic reaction is swelling at the place where the shot is given.
People can also have severe, shock-like reactions to an allergy shot.
This type of reaction is called anaphylaxis and is very serious. But this problem rarely happens. In case you have a bad reaction, your doctor will have you stay at the office for about 20 minutes every time you get your injection. That way, if you have a reaction to the shot, your doctor can give you something right away to stop it. Lose one pound, Smoking costs.