Why are allergy shots given in both arms


Q: Why are allergy shots given in both arms for some adults?
I've been researching it and it explains the process very well except for why it's injected in both arms rather than two shots in one.


A:   Hello
Thank you posting your query on “Ask the Doctor”

Good Question
There are 2 vials (such as “LEFT” and “RIGHT”), there should be 2 injections each time. The vials with the lowest (smallest) numbers should be used first. Numbered vials are always given in sequence.
Actually the logic is allergy shots may develop severe anaphylactic (adverse) reaction. If full dose is given it could be life threatening.
Hence small unit is used first and patient is observed for 30 minutes for any adverse reaction and if no reaction is seen other shot is given.

Hope this was helpful

Related Q&A

Q: I have regular steaching of one side jaw in my mouth .but do not have any pain whats the reason

Q: Red pimples scattered on top of my foot? I had alopecia and took steroid injections to my head for 1 year.

Q: When I eat/use items containing Vitamin E I get a rash on the inside of my elbow. The skin becomes reddish and there ...

Q: I need help, I'm unable to sneeze , usually I sneeze regularly now I feel the sensation and desire to do it but somet...

Q: I broke out in red rashes all over my body except for my face and my knees to my ankles. I have been using prednozone...


Dr. James Obaji M.D.

  • 247 Reviews
  • Family Physician

Dr. Suneel Sharman M.D.

  • 190 Reviews
  • Family Physician

Dr. Pat Golden M.D.

  • 169 Reviews
  • Cardiologist

Dr. Kunaal Jindal M.D.

  • 112 Reviews
  • Plastic Surgeon