Allergy Shot Immunotherapy: A Step-by-Step Walkthrough of One Visit
Each allergy shot visit follows a fixed protocol: pre-injection screening, dose preparation from a personal vial, subcutaneous injection into the upper arm, and a mandatory 30-minute observation period — totaling about 45 minutes. Approximately 85% of systemic reactions occur within this 30-minute window, which is why leaving early is not safe. Most patients tolerate injections well, with only mild local redness.
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Each allergy shot visit follows a fixed protocol: brief pre-injection health screening, allergen dose drawn from your personal vial, subcutaneous injection into the upper arm, then 30 minutes of mandatory observation period at home. Most visits take 40-50 minutes total.
What Actually Happens During an Allergy Shot Appointment
An allergy shot session is a structured, repeatable process — the same steps occur every time, whether it is your third injection or your fiftieth. Understanding what happens at each step removes uncertainty for new patients and helps experienced patients know what to flag to their care team.
The singular 'shot' in 'allergy shot' captures the reality: each session centers on one injection (sometimes two if multiple allergen vials are prescribed). A session takes roughly 45 minutes — a few minutes for a health check, a few for dose preparation and the injection, and 30 minutes of post-injection observation. During that window, most significant allergic reactions occur if they are going to occur: data from the AAAAI/ACAAI surveillance study confirm that approximately 85% of systemic reactions begin within 30 minutes (Epstein et al., Ann Allergy Asthma Immunol 2011).
For patients who find weekly clinic trips logistically difficult, at-home SCIT is now an alternative: with a kit like Curex you self-inject at home, with the first injection from each new vial or concentration supervised live in the Virtual Shot Room by trained Curex clinical staff and a prescribed epinephrine auto-injector confirmed on hand at the injection location. At-home allergy testing through Curex, which screens for 40+ allergens, can also clarify your sensitization profile before you begin.
The injection itself uses a 26-27 gauge, half-inch needle — considerably smaller than vaccine needles — inserted into the subcutaneous fat of the posterior upper arm. Most patients describe it as a brief mild pinch, significantly less uncomfortable than a blood draw or vaccine.
Roughly 85% of systemic reactions begin within 30 minutes of an injection, so a post-injection observation window matters — in a clinic, and equally at home with Curex, where the first injection from each new vial or concentration is supervised live in the Virtual Shot Room by trained Curex clinical staff and a prescribed epinephrine auto-injector is confirmed on hand at the injection location.
Ready to skip the surprise bills?
At-home allergy shots (SCIT) are designed by board-certified allergists. See the listed SCIT plan rate in our pricing record and request a quote for eligibility, initiation and total care costs.
- MD-ledBoard-certified allergists
- QuoteTotal care estimate
- 50K+Patients treated
- HSA/FSAEligible
Same proven results. No clinic visits.
Curex at-home allergy shots are clinician-supervised; confirm your current program quote before enrolling.
Join the waitlistCurex allergy shot serum is compounded at a specialty pharmacy for each patient, and the FDA does not review compounded products for safety or efficacy.
At-Home Allergy Shots vs Sublingual Drops: Two Home Options
Both immunotherapy routes can now be done largely at home. Sublingual immunotherapy (SLIT) delivers immune tolerance through daily drops under the tongue after an initial allergist consultation; at-home SCIT through Curex delivers the proven shot route as one weekly self-injection, with the first injection from each new vial or concentration supervised live in the Virtual Shot Room by trained Curex clinical staff — so patients who once needed weekly clinic visits with a 30-minute post-injection wait no longer do.
| Treatment | Efficacy | Duration | Cost (5yr) | Convenience | Safety |
|---|---|---|---|---|---|
At-Home Allergy Shots (SCIT) — CurexBest | 33% symptom reduction vs placebo; disease modification lasting 7-12 years | 3-5 years; one weekly shot at home with Curex during build-up, less often at maintenance | $3,000-$15,000 depending on insurance | Given at home with Curex instead of the clinic; the first injection from each new vial or concentration is supervised live in the Virtual Shot Room by trained Curex clinical staff, with a brief self-observation afterward | 0.1% systemic reaction rate; with Curex, a USP <797> sterile-compounded serum, a prescribed epinephrine auto-injector confirmed on hand at the injection location, and Virtual Shot Room supervision by trained Curex clinical staff for the first injection from each new vial or concentration keep it safe for eligible patients |
Sublingual Drops (SLIT) | Comparable efficacy for major allergens in network meta-analyses | 3-5 years; daily drops at home | $468-$3,600 depending on provider | Fully at home; no needles, no waiting room, no weekly clinic visits | Zero documented fatalities worldwide; local oral reactions are the norm |
- Efficacy
- 33% symptom reduction vs placebo; disease modification lasting 7-12 years
- Duration
- 3-5 years; one weekly shot at home with Curex during build-up, less often at maintenance
- Cost (5yr)
- $3,000-$15,000 depending on insurance
- Convenience
- Given at home with Curex instead of the clinic; the first injection from each new vial or concentration is supervised live in the Virtual Shot Room by trained Curex clinical staff, with a brief self-observation afterward
- Safety
- 0.1% systemic reaction rate; with Curex, a USP <797> sterile-compounded serum, a prescribed epinephrine auto-injector confirmed on hand at the injection location, and Virtual Shot Room supervision by trained Curex clinical staff for the first injection from each new vial or concentration keep it safe for eligible patients
- Efficacy
- Comparable efficacy for major allergens in network meta-analyses
- Duration
- 3-5 years; daily drops at home
- Cost (5yr)
- $468-$3,600 depending on provider
- Convenience
- Fully at home; no needles, no waiting room, no weekly clinic visits
- Safety
- Zero documented fatalities worldwide; local oral reactions are the norm
For patients who want the proven shot route without weekly clinic visits, Curex offers an at-home allergy shot kit (SCIT) prescribed and overseen by board-certified allergists with pricing confirmed in a current program quote — a personalized serum sterile-compounded to USP <797>, one weekly injection you give yourself at home, and the first injection from each new vial or concentration supervised live in the Virtual Shot Room by trained Curex clinical staff after a prescribed epinephrine auto-injector is confirmed on hand at the injection location.
Join the waitlistWhat to Watch For During and After Your Allergy Shot
Allergy shot reactions exist on a spectrum from expected and manageable to rare and requiring emergency response. Understanding this spectrum empowers patients to respond appropriately rather than dismissing a reaction that needs attention or panicking over a normal local response. The 30-minute observation period exists specifically to catch and treat reactions at the higher end of the severity spectrum before patients leave the clinic.
Redness, mild swelling, and itching at the injection site are very common — occurring in 26-86% of patients at some point during SCIT (Tankersley et al., JACI 2000). These reactions reflect local mast cell activation and are a normal part of the immune response to allergen. They typically peak within 30-60 minutes and resolve within a few hours, rarely lasting beyond 24 hours.
Apply a cold compress or ice pack. An over-the-counter antihistamine can help with itching. Measure the size of the reaction and report to the nurse if swelling is larger than a golf ball (about 25mm in diameter).
A local reaction larger than 25mm in diameter (roughly the size of a golf ball) or that lasts longer than 24 hours warrants a dose adjustment conversation with your allergist. Large local reactions are not individually predictive of systemic reactions (Tankersley et al., JACI 2000), but repeated large local reactions at the same dose level may indicate the dose should be held or reduced before advancing.
Report the size and duration to your nurse at the next visit. Your allergist may hold the current dose, reduce it, or recommend premedication with an antihistamine before future injections.
Mild systemic reactions — symptoms appearing away from the injection site — occur in approximately 0.1% of injection visits and in 3-12% of patients at some point during their treatment course. These typically begin within 30 minutes, which is why the observation period exists. They range from a runny nose or sneezing (Grade 1) to hives, mild asthma symptoms, or abdominal discomfort (Grade 2) per the WAO grading system (Cox et al., JACI 2010).
Notify your care team immediately. With at-home SCIT through Curex, the first injection from each new vial or concentration is supervised live in the Virtual Shot Room by trained Curex clinical staff and a prescribed epinephrine auto-injector and oral antihistamines are confirmed on hand at the injection location for exactly this reason. After any systemic reaction, your allergist will typically reduce your next dose and may prescribe an antihistamine to take before future injections.
Severe anaphylaxis from allergy shots is rare — historically approximately 1 fatality per 2.5 million injections (Bernstein et al., JACI 2004), and modern surveillance (Epstein et al., JACI Pract 2019) shows even lower rates with 7 fatalities over 54.4 million injection visits from 2008-2016. However, it can happen, which is why every injection requires a prescribed epinephrine auto-injector confirmed on hand at the injection location and physician oversight — traditionally in a clinic, and with at-home SCIT through Curex via the first injection from each new vial or concentration supervised live in the Virtual Shot Room by trained Curex clinical staff. Risk factors include uncontrolled asthma, a prior systemic reaction, and receiving injections during peak pollen season.
Use your prescribed epinephrine auto-injector immediately and call 911. Remain lying down. Monitor for a biphasic reaction (5-20% of anaphylactic reactions have a second phase 1-72 hours later). This is why every allergy shot requires a prescribed epinephrine auto-injector confirmed on hand at the injection location and physician oversight — and why trained Curex clinical staff supervise the first injection from each new vial or concentration live in the Virtual Shot Room.
When to Worry: Decision Guide
Is the reaction limited to the injection site only?
Local reaction
Apply ice, take an OTC antihistamine if itchy. Report size to nurse at next visit if larger than 25mm.
Possible systemic reaction
Use your prescribed epinephrine auto-injector if symptoms are systemic, call 911, and notify your care team immediately — on a Virtual Shot Room supervised dose trained Curex clinical staff direct treatment live.
Are symptoms mild (runny nose, sneezing, localized hives)?
Grade 1-2 systemic reaction
Nurse administers antihistamine and monitors. Allergist will adjust future dosing. Carry epinephrine auto-injector going forward.
Possible anaphylaxis
Call 911. Clinic staff administers epinephrine immediately. Do not wait to see if symptoms resolve on their own.
Frequently asked questions
What happens during a typical allergy shot appointment?
A typical allergy shot session follows a consistent sequence. First comes a review of any reactions since the last injection and whether a dose adjustment is needed — patients with asthma may have their peak flow checked. The prescribed dose is drawn from your personal vial, given as a subcutaneous injection into the posterior upper arm with a 26-27 gauge needle, and the site is checked briefly. Then comes a 30-minute observation window. With at-home SCIT through Curex, you self-inject at home with the first injection from each new vial or concentration supervised live in the Virtual Shot Room by trained Curex clinical staff, then self-observe for 30 minutes; in a clinic, a nurse performs these steps. Either way the session runs roughly 40-50 minutes.
Do allergy shots hurt?
Most patients describe allergy shots as a brief, mild pinch — less uncomfortable than a typical blood draw or vaccine. The needle used is a 26-27 gauge, half-inch length, which is one of the finest-gauge needles used in clinical medicine. The subcutaneous fat layer targeted by the injection is also less pain-sensitive than muscle (where vaccines go) or the dermis (where skin tests go). Some patients feel mild stinging or itching at the injection site in the minutes after injection — this is a normal local mast cell response, not damage. If a particular injection feels significantly more painful than usual, inform the nurse — it may indicate the angle placed the needle closer to the dermis.
Why do you have to wait 30 minutes after an allergy shot?
Approximately 85% of systemic allergic reactions to allergy shots begin within 30 minutes of injection (Epstein et al., Ann Allergy Asthma Immunol 2011). The post-injection observation period exists specifically to catch and treat these reactions while trained staff and epinephrine are immediately available. Leaving before 30 minutes is complete means that if a reaction develops on the drive home, you would be without clinical support. This is not a precaution that can be safely skipped based on prior good tolerability — some reactions occur after a string of uneventful injections, particularly if the dose was recently increased or if the patient is in their peak allergy season.
Can you exercise after an allergy shot?
Exercise should be avoided for at least 2 hours after receiving an allergy shot. Physical activity increases blood flow throughout the body, which accelerates allergen absorption from the subcutaneous injection site into systemic circulation — potentially triggering a reaction that would not have occurred with rest. The AAAAI/ACAAI Practice Parameter (Cox et al., JACI 2011) specifically cites post-injection vigorous exercise as a risk factor for systemic reactions. Light activity and normal daily tasks are generally fine after the 30-minute observation period is complete, but running, gym workouts, and competitive sports should wait at least 2 hours.
What should you do if you have a reaction at home after an allergy shot?
If symptoms develop in the hours after leaving the clinic — hives, widespread itching, runny nose, wheezing, or any systemic symptoms — contact your allergist's office immediately. For mild symptoms, an oral antihistamine is often the first step while you call for guidance. For any signs of throat tightening, difficulty breathing, dizziness, or severe wheezing, use an epinephrine auto-injector if prescribed and call 911 immediately. A phenomenon called biphasic anaphylaxis affects 5-20% of patients who have an initial anaphylactic reaction — a second reaction can occur 1-72 hours after the first. This is why any systemic reaction warrants medical evaluation even after initial recovery.
How long does a build-up phase allergy shot visit take compared to maintenance?
Both build-up and maintenance visits follow the same protocol — check-in, dose preparation, injection, and 30-minute observation — so the total time is similar: approximately 40-50 minutes. The practical difference is frequency: build-up visits occur once weekly (requiring roughly 25-30 visits over 3-6 months), while maintenance visit frequency is set on a schedule individualized by your allergist. Over a 3-year course, the AAAAI/ACAAI protocol estimates approximately 57-65 total visits. At about 45 minutes per visit including travel, a typical 3-year SCIT course consumes an estimated 85-110 hours of patient time, most of which occurs during the intensive build-up phase.
What is in the allergy shot vial?
Your allergy shot vial contains a liquid suspension of allergen extracts — proteins derived from the specific allergens your allergy testing identified as triggers. The extract is diluted in a saline solution, often with glycerin added as a stabilizer (preserving potency for 3-5 years). Your personal vials are prepared by your allergist's office from commercially manufactured allergen extract concentrates. The build-up series uses progressively less dilute vials, starting from a highly dilute concentration and advancing through intermediate steps to the full maintenance dose. Each vial is labeled with your name and the specific allergen concentrations.
Do you need a prescription for allergy shots?
Yes — allergy shots require a prescription and physician oversight. A board-certified allergist uses skin tests or specific IgE blood tests to identify your sensitized allergens, sets appropriate starting doses, and prescribes a personalized allergen extract series. The AAAAI/ACAAI Practice Parameter calls for injections to be given with a physician available and epinephrine and anaphylaxis equipment confirmed on hand at the injection location — historically a clinic requirement. At-home SCIT programs like Curex now meet that standard differently for eligible patients: a personalized serum sterile-compounded to USP <797>, a prescribed epinephrine auto-injector confirmed on hand at the injection location, the first injection from each new vial or concentration supervised live in the Virtual Shot Room by trained Curex clinical staff, and gradual escalation — so the weekly injection can be self-administered at home. A large safety study of self-administered allergen immunotherapy (Schaffer et al., 2015) supports this model: across 23,614 patients giving 2,021,600 injections, the systemic reaction rate was just 0.16% per patient with no fatalities. FDA-approved sublingual tablets similarly need only the first dose supervised.
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Read moreGet your allergy shots — without the clinic.
Curex at-home shots require a program quote. Confirm what is included in your plan — a personalized serum compounded to USP <797> sterile standards, board-certified allergist oversight, and one weekly injection you give yourself at home. No clinic visits, no facility fees. HSA/FSA eligible.
Program quote required · Remaining payments for shipped treatment are collected on cancellation
Curex allergy shot serum is compounded at a specialty pharmacy for each patient, and the FDA does not review compounded products for safety or efficacy.
This content is for informational purposes only and does not constitute medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider with questions about a medical condition. Content reviewed by board-certified allergists at Curex.
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