How Often Do You Get Allergy Shots? A Busy Person's Guide
- About 80% of people see significant improvement with allergy shots (Cleveland Clinic).
- Standard allergy shots are given once or twice a week for 4 to 6 months, then every 2 to 4 weeks for 3 to 5 years (AAAAI).
- Plan on waiting 30 minutes in the office after every shot.
- Cluster and rush schedules can shorten the build-up phase, but maintenance still runs for years.
- In the trial that established ILIT, the allergy shot group got 54 injections over three years. The ILIT group got three, over two months.
Standard allergy shots are given once or twice a week while your dose builds up, then every two to four weeks for three to five years. That's the schedule the American Academy of Allergy, Asthma & Immunology (AAAAI) describes for subcutaneous immunotherapy (SCIT), which is what most people mean by allergy shots.
The shots work for most people who see them through. About 80% of people get significant relief from their symptoms, according to Cleveland Clinic. The hard part is the calendar. In the 2008 trial that first tested ILIT (intralymphatic immunotherapy) against allergy shots, the shot group got 54 injections over three years.
Newer options cut most of that. ILIT uses three injections over about two months. Allergy tablets, a form of sublingual immunotherapy (SLIT) the FDA first approved in 2014, are taken at home. If the schedule is what's kept you from treatment, both are worth knowing about before you sign up for years of office visits.
The allergy shot build-up phase: once or twice a week
Each shot in the build-up phase carries a slightly higher dose of your allergens than the last. The AAAAI says these shots are given about once or twice a week, and the phase takes four to six months. Some clinics run it longer. Cleveland Clinic describes one to three shots a week for six to ten months.
The pace can also change along the way. If a shot causes a strong reaction, your allergist may repeat or lower the dose instead of moving up, which adds visits.
The maintenance phase: every two to four weeks
Once you reach your target dose, visits spread out. The AAAAI says maintenance shots are typically given every two to four weeks and continued for three to five years.
This is where most of the time goes. At one shot a month, three to five years of maintenance works out to roughly 36 to 60 more visits.
Add the build-up and the total climbs. On the lightest version of the AAAAI schedule (weekly shots for four months, then one every four weeks for three years), a full course comes to about 55 office visits. The heaviest version runs well past 150.
The part that isn't on the schedule
You don't leave right after a shot. The AAAAI strongly recommends waiting in the office for 30 minutes, because serious reactions usually develop within that window.
Add the drive each way, and a quick shot becomes a standing hour or more on your calendar, every week at first. For many people, that time is the hardest part of allergy shots. It keeps plenty of people from starting at all. The researchers behind the first ILIT trial noted that fewer than 5% of allergy patients get immunotherapy, and named its long duration as one of the reasons.
How often can you get allergy shots?
Sometimes more than once a week. Allergists can speed up the build-up phase with accelerated schedules:
- Cluster schedules give several shots in one visit. The AAAAI says this can shorten build-up by at least one to two months.
- Rush schedules give many shots over a single day and can reach the maintenance dose in weeks. The risk of a reaction is higher, so rush dosing usually comes with medication beforehand and closer monitoring.
A 2023 study in The Journal of Allergy and Clinical Immunology: In Practice compared the three approaches at one allergy practice. Patients on a standard weekly schedule took an average of about 31 weeks to reach their maintenance dose. Cluster patients took about 19 weeks, and rush patients about 17.
What you can't do is space doses however you like. Your allergist sets the plan, and a long gap between shots can mean stepping the dose back down and building up again.
If weekly visits won't fit your life
Accelerated schedules shorten the start, not the whole course. Maintenance still runs for years.
Two other forms of immunotherapy change the math more.
Allergy drops or tablets (SLIT) go under the tongue at home, usually daily, with periodic check-ins at the office. The AAAAI says treatment may be needed for three years or longer. You trade most of the clinic trips for a daily routine.
ILIT (intralymphatic immunotherapy) injects the allergen directly into a lymph node, guided by ultrasound. The trial that established it used three injections four weeks apart, and a typical course today looks similar. ILIT is newer and hasn't been reviewed for FDA approval. Not every allergist offers it yet. If your calendar is what's keeping you from treatment, it's the option most worth asking about.
Our comparison of allergy shots, allergy drops, and ILIT lays out all three side by side.
Before you commit to a schedule
Ask which build-up schedule the clinic uses, and whether cluster dosing is an option for you. If you travel often, ask how the clinic handles a missed shot. The answer tells you how much a busy month would really set you back.
Ready to talk about a shorter option? Find an ILIT provider near you.
Frequently Asked Questions
Yes. In the 2008 trial that established ILIT, patients' tolerance to grass pollen had already improved four months after their first injection, and three years later it matched what the allergy shot group had reached. A full ILIT course is three injections over about two months, which makes it the fastest allergy treatment course of the three immunotherapy options. Not every allergist offers it yet. Our directory of ILIT providers shows who does near you.
You can, but it may cost you ground. After a long gap, many allergists step the dose back down and build up again, and each practice sets its own rules for how long a gap triggers that. An AAAAI work group found wide variation in how allergists adjust doses after missed shots. If a busy stretch or a long trip is coming, tell your clinic ahead of time so they can plan around it.
No. Shots are usually stopped after three to five years of maintenance. The AAAAI also sets a checkpoint: if you haven't seen improvement after a year of maintenance shots, your allergist should look at other treatment options with you.
Generally not. The AAAAI says the preferred place for shots is your allergist's office, or another office whose staff are trained to recognize and treat a reaction. If an at-home routine matters to you, sublingual allergy drops or tablets (SLIT) are the immunotherapy designed for home use.
