If you struggle with allergies year after year, you may have heard about allergy shots. Many patients ask us about them at Allergy Doctor Dallas. But how do allergy shots actually work? Let’s break it down in simple terms so you can understand what they do and how they may support allergy care over time.
What Are Allergy Shots?
Allergy shots are a type of allergy immunotherapy. They expose your immune system to very small amounts of an allergen. An allergen is a substance that triggers an allergic reaction. Common examples include:
Tree pollen
Grass pollen
Weed pollen
Dust mites
Pet dander
Mold
The goal is to help your immune system slowly become less sensitive to these triggers. Over time, some patients notice that their allergy symptoms become easier to manage.
How Allergy Shots Work in the Body
Allergy shots train your immune system in small steps.
Here is the simple idea:
A tiny amount of an allergen enters your body through an injection.
Your immune system recognizes it.
The dose slowly increases over time.
Your immune system may learn to react less strongly.
This process helps the body build tolerance to allergens. Because the change happens slowly, the treatment plan usually takes place over several months or longer.
FOR SCIENCE NERDS:
Here are some of the science concepts used to describe what happens when we give allergy shots:
TH2 cells are suppressed.
Inhibition of IgE dependent activation of mast cells and basophils
Immune activation toward Th1 responses and B regulatory cells
Production of allergen-neutralizing antibodies
Induction of innate regulatory lymphoid cells, or Tregs
Suppression of pro-inflammatory Th2 and T follicular helper cells
Exhaustion of Th2A cells
Exptression of nasal and systemic IgA antibodies
Allergen neutralizing antibodies: capture allergens in the mucosal surface, inhibit mast cell activation, and prevent FcERII mediated allergen presentation
Early changes with SCIT or SLIT:
Reduction in Degradation of Mast cells and basophils
Decrease in histamine release
Decreased production of IL4, IL5, IL13, IL9
Decreased proliferation of eosinophils
Late changes with high-dose immunotherapy:
Increase in regulatory dendritic cell markers
Expression of complement component 1
Expression of stabilin-1
Promotes dendritic cells to secrete IL12 , IL 27 and IL10
Down regulates CD86
Modulates innate lymphoid cells or ILC2s. –suppresses them.
Induces a novel ILC that can produce IL10
ILC1s are increased and express CD25
So you see, it’s very complicated. Taking the shots is simple . Your body does the rest.
Weed pollens like ragweed, sagebrush, marshelder, carelessweed
Grass pollens like bermuda, timothy, johnson, rye
Mold spores like alternaria, aspergillus, helminthosporium, penicillium ( the spores are not the same as the medication)
Many Dallas patients experience symptoms for much of the year. These symptoms may include:
Sneezing
Stuffy nose
Runny nose
Itchy eyes, nose, ears, skin and sometimes palate.
Sinus pressure
Headaches
Fatigue
Poor quality sleep
Mouth breathing
Coughing
Secondary sinus infections
Supportive therapies like allergy immunotherapy may be discussed with Dr. Baxter when symptoms continue despite routine care.
Who Might Consider Allergy Shots?
Not everyone with allergies needs allergy shots. But some patients may discuss this option with Dr. Baxter.
She may talk about immunotherapy if you:
Have moderate to severe allergy symptoms for three months of the year, 2 years in a row.
Need frequent allergy medications
Find medications working less and less well
Experience long allergy seasons
Want a long-term approach to allergy management with relief that lasts for years after treatment concludes.
At Allergy Doctor Dallas, Dr. Baxter helps patients understand their allergy triggers and explore supportive care options.
What the Allergy Shot Process Looks Like
Allergy shots usually follow two phases.
1. Build-Up Phase
During this stage:
Injections happen regularly
The allergen dose slowly increases
The goal is gradual immune exposure
2. Maintenance Phase
Once the target dose is reached:
Shots occur less often
The immune system continues to receive steady exposure
Each patient’s plan may look a little different. Dr. Baxter will guide the process and monitor your response.
Are Allergy Shots Safe?
Allergy shots have been used for many years under medical supervision.
Like many medical therapies, they may cause side effects for some people. These may include:
Mild redness or swelling at the injection site
Temporary allergy symptoms
Serious reactions are rare but possible. Because of this, allergy shots are given in a medical setting where staff can monitor patients after each injection. Note: We prescribe and require that patients carry epinephrine to reverse reactions in case symptoms start after the 30-minute observation period. If a reaction occurs while you are under our care, we will provide the medications to treat it, and we will observe you for a minimum of one hour after the reaction. Dr. Baxter will discuss potential risks and safety steps before starting therapy.
How Allergy Specialists Personalize Treatment
Every patient’s allergies are different.
At Allergy Doctor Dallas, Dr. Baxter often starts with allergy testing. This helps identify the substances that trigger your symptoms.
From there, your care team may discuss:
Environmental changes that reduce allergen exposure
Medication review
Education about immunotherapy options
The goal is to help patients better understand their immune response and explore supportive care strategies.
When to Talk to an Allergy Specialist
You may benefit from an allergy evaluation if you experience:
Allergy symptoms most of the year
Poor sleep due to congestion
Frequent sinus pressure
Limited relief from over-the-counter medications
An allergy specialist like Dr. Baxter can help determine what triggers your symptoms and review options that may support long-term symptom control.
Supporting Allergy Care in Dallas
Allergies can disrupt sleep, work, and daily life. The good news is that several supportive care strategies exist. If you live in Dallas and want to learn more about allergy immunotherapy, the team at Allergy Doctor Dallas can help you better understand your options.
With the right information and guidance, many patients feel more confident managing their allergies.
