We always recommend that patients wait the full 30 minutes after an allergy shot, because there's a risk of a life-threatening reaction called anaphylaxis that could happen. Usually it happens between 3 and 30 minutes, and that's why we want you to wait 30 minutes now. Thankfully, this is pretty rare and it doesn't happen often, but unfortunately it can happen at any time during your allergy shot program, which means even if you've done well with last shots, you can still have an anaphylactic reaction with the knife.
This is also why we have our patients have an EpiPen. So if there's any chance that you think you're having an anaphylactic reaction, which is usually your chest is tight, you're having shortness of breath and you might feel like really like a sense of impending doom. We always recommend that you immediately use your EpiPen and call 9 1 1.
Anyways. Thanks so much. Stay safe.