How long after allergy tests do they start shots?

Up to you. Some people recognize that shots are the best way to treat their allergies, and know that the currently available medications don't work well for them - they want to start right away, such as a day or two after testing. Others want to try different medications, and might not decide to start the shots until they've been trying medications for a year or two and are frustrated that they don't work.
Within one week. After reviewing your allergy tests with your doctor, special vials containing the substances to which you are allergic are prepared. Depending on your doctor's office, this material can often be prepared within one week - sometimes even more quickly - and allergy injections can be started.

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