How many days can I go without my allergy injections before I have to start over?

Variable. Depending where you are in your allergy injection schedule and how long it has been since your last shot will all factor into when you may need to restart your shots. If you are on maintenance therapy receiving your shots every 2-4 weeks and you missed one or two shot you will not have to start over. If it has been months or years since your last shot then you will probably have to start over.