Allergy shots, also called "immunotherapy," are given to increase your
tolerance to the substances (allergens) that provoke allergy symptoms. They
usually are recommended for people who suffer from severe allergies or for those
who have allergy symptoms more than 3 months each year. They do not cure
allergies, but reduce your sensitivity to certain substances.
How Often Are Allergy Shots Given?
Allergy shots are given regularly (in the upper arm), with gradually
increasing doses. When starting immunotherapy, you will need to go to your
healthcare provider once or twice a week for several months. The dose is
increased each time until the maintenance dose is reached. If the shots are
effective, you will go to your healthcare provider every 2 to 4 weeks for 2 to 5
more years. You may become less sensitive to allergens during this time, and
your allergy symptoms will become milder and may even go away completely.
How Should I Prepare for Allergy Shots?
For two hours before and after your appointment, do not exercise or engage in
vigorous activity. Exercise may stimulate increased blood flow to the tissues
and promote faster release of antigens into the bloodstream.
Tell your doctor about all the medications you are taking. Some medications,
such as beta blockers, can interfere with the treatment and/or increase the risk
of side effects. You may have to stop allergy shots if you are taking these
Talk to your doctor about the safety of continuing the allergy shots if you
are pregnant or planning to become
What Should I Expect After Allergy Shots?
Usually, you will be monitored for about 30 minutes after receiving an
allergy shot to make sure that you don't develop side effects such as
eyes, shortness of breath, runny nose, or tight throat. If you develop these
symptoms after you leave the doctor's office, take an antihistamine and go back
to your doctor's office or go to the nearest emergency room.
Redness, swelling, or irritation within one inch of the site of the injection
is normal. These symptoms should go away within 4 to 8 hours after receiving the
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