Getting allergy shots is a multi-step process that starts with allergy testing, moves through a referral to an allergist, and involves a commitment of three to five years of regular injections. The shots work by gradually training your immune system to stop overreacting to specific triggers like pollen, dust mites, pet dander, or insect venom. Here’s what the full process looks like from your first appointment to the end of treatment.
Step 1: Get Allergy Testing
Before you can start allergy shots, you need a confirmed diagnosis of what you’re allergic to. This usually means visiting an allergist, which you can do through a referral from your primary care doctor or, depending on your insurance, by booking directly.
The most common test is a skin prick test, where tiny amounts of suspected allergens are scratched into the surface of your forearm or back. Within about 15 to 20 minutes, small raised bumps appear at the sites of allergens you react to. Some allergists also use a blood test that measures the level of allergy-related antibodies in your system. The results tell your allergist exactly which substances trigger your symptoms and how strongly you react to each one. This profile determines whether you’re a good candidate for shots and what goes into your custom serum.
Allergy shots work best for environmental allergies (pollen, mold, dust mites, animal dander) and insect sting allergies. They aren’t used for food allergies or medication allergies.
Step 2: Understand the Two Treatment Phases
Allergy shot treatment is split into two distinct phases: a buildup phase where the dose increases gradually, and a maintenance phase where you receive a steady dose over several years.
The Buildup Phase
During the buildup, you visit your allergist’s office one to three times per week for injections of increasing allergen doses. A standard buildup protocol reaches the target dose in roughly 22 to 31 weeks. If that timeline feels long, two faster options exist. A cluster protocol condenses the buildup to around 19 weeks by giving multiple injections per visit. A rush protocol can get you to your maintenance dose in as few as 9 to 16 weeks, though it requires more monitoring since the pace is faster. Your allergist will recommend the approach that fits your health profile and tolerance for risk.
The Maintenance Phase
Once you hit your target dose, visits drop to roughly once every two to four weeks. This phase continues for three to five years. The length matters: the longer you stay on maintenance, the more likely your symptom relief will persist after you stop. Some people experience lasting relief for years after completing treatment, while others see symptoms gradually return.
What Happens at Each Appointment
Each visit is straightforward but takes some time. You’ll receive one or two injections in the upper arm, depending on how your serum is formulated. Many allergists split the allergens into two separate vials to prevent certain proteins from degrading each other, which means two shots per visit rather than one.
After each injection, you’re required to wait in the office for at least 30 minutes. This observation period exists because the majority of serious allergic reactions to the shots occur within that window. Over a 10-year study of more than 57,000 injections, systemic reactions occurred about 72 times among 50 patients, a low rate overall. However, roughly half of those reactions happened after the 30-minute mark, which is why some allergists may ask you to wait longer or keep a close eye on how you feel for the rest of the day.
Most side effects are mild: redness, swelling, or itching at the injection site. These typically fade within a few hours. More significant reactions, like hives, throat tightness, or breathing difficulty, are rare but possible, which is why every shot is given in a medical office equipped to handle them.
How Allergy Shots Actually Work
Your immune system normally fights allergens by producing a type of antibody called IgE, which triggers mast cells to release histamine and other inflammatory chemicals. That’s what causes the sneezing, itching, and congestion you’re trying to get rid of.
Allergy shots prompt your body to produce a different class of antibodies that act as blockers. These blocking antibodies intercept allergens before they can latch onto the IgE-loaded cells, so the inflammatory chain reaction never fires. In the first year of treatment, one type of blocking antibody does most of the work. As treatment continues, a longer-lasting type called IgG4 takes over as the dominant protector in most people. This shift is part of why the full three-to-five-year course matters: the immune retraining deepens over time.
What It Costs
Most health insurance plans cover allergy shots, but you’ll typically owe a co-pay for each visit. Those co-pays add up quickly. At $20 per visit with weekly appointments, you’re looking at roughly $1,040 per year. If your allergist uses two separate serum vials (which is common), the co-pay may double to $40 per visit, bringing the annual cost closer to $2,080. Over a minimum three-year course, total co-pays can range from about $3,120 to $6,240 or more.
There are also upfront costs for the initial allergy testing and the custom-mixed serum vials, which may be billed separately. Before starting, it’s worth calling your insurance to confirm how immunotherapy visits are coded and what your specific co-pay will be.
Sublingual Immunotherapy: An Alternative to Shots
If weekly office visits or needles are a dealbreaker, sublingual immunotherapy is worth asking about. Instead of injections, you dissolve a tablet or drops under your tongue at home each day. The treatment works through the same immune-retraining principle as shots.
In children with allergic rhinitis, studies show sublingual and injection-based immunotherapy produce similar reductions in symptom scores and medication use. The main trade-off is convenience versus coverage. Sublingual tablets can be self-administered, eliminating most office visits. They also carry a significantly lower rate of treatment-related side effects compared to shots. The downside is that sublingual options are currently available for only a handful of specific allergens (certain grass pollens, ragweed, and dust mites), while shots can be customized to treat a broad mix of triggers simultaneously. Insurance coverage for sublingual therapy also varies more widely.
Tips for Staying on Track
The biggest obstacle to successful treatment isn’t side effects or cost. It’s consistency. Many people start allergy shots and quit before reaching the maintenance phase, which means they never get the full benefit. A few practical strategies help.
- Choose a convenient office. If your allergist is a 45-minute drive away, weekly visits will feel unsustainable. Some primary care offices and ENT clinics can administer the shots once your allergist mixes the serum, so ask whether that’s an option.
- Build visits into your routine. Scheduling a recurring appointment on the same day and time each week (before work, during a lunch break) reduces the mental load of remembering.
- Ask about accelerated buildup. If the months-long buildup phase feels daunting, a cluster or rush protocol can cut the number of visits from an average of 27 down to as few as 16.
- Track your symptoms. Keeping a simple log of how you feel each season gives you tangible proof that the treatment is working, which makes it easier to stay motivated during year two or three.
Most people notice meaningful symptom improvement within the first year of maintenance, though full benefit often builds through year two and beyond. Completing the entire course gives you the best chance of lasting relief even after you stop the injections.