Allergies are treated with a combination of avoidance strategies, medications, and in some cases, long-term immunotherapy that can reduce your sensitivity over time. The right approach depends on what you’re allergic to, how severe your symptoms are, and whether you’re dealing with seasonal flare-ups or year-round triggers. Most people get significant relief from over-the-counter options alone, but persistent or severe allergies often benefit from a layered treatment plan.
Start With Antihistamines
Antihistamines are the most common first step. They work by blocking histamine, the chemical your immune system releases when it encounters an allergen, from attaching to receptors in your nose, eyes, and throat. That’s what causes the sneezing, itching, and runny nose you’re trying to stop.
Second-generation antihistamines (cetirizine, loratadine, fexofenadine) are the go-to choices because they target receptors outside the brain, which means they cause far less drowsiness than older options like diphenhydramine. They also last 12 to 24 hours per dose, compared to just 4 to 6 hours for first-generation versions. Loratadine, for example, starts working within 1 to 3 hours and hits peak effectiveness between 8 and 12 hours. That makes daily dosing simple, and most people tolerate these well for months at a time.
First-generation antihistamines like diphenhydramine still have a role if you need something fast-acting at bedtime, but they cross into the brain easily, causing sedation, sluggish thinking, and dry mouth. They’re a poor choice for daytime use.
Nasal Steroid Sprays for Congestion
If stuffiness is your main problem, antihistamines alone often aren’t enough. Nasal corticosteroid sprays (fluticasone, budesonide, triamcinolone) are considered the first-line treatment for nasal congestion from both seasonal and year-round allergies. They reduce inflammation inside the nasal passages, which cuts down on mucus production and can also help with sneezing.
The key with these sprays is timing. They don’t work instantly. For seasonal allergies like hay fever, you should start using the spray about two weeks before your symptoms typically begin. This gives the medication time to build up its anti-inflammatory effect. If you wait until you’re already miserable, it can take several days to catch up. Used consistently, nasal steroids are more effective at relieving congestion than any antihistamine.
Reducing Allergens in Your Home
Medications manage symptoms, but reducing your exposure to triggers can lower the amount of medication you need. For indoor allergens like pet dander and dust mites, air filtration makes a measurable difference. HEPA filters in clinical studies reduced airborne cat allergen by about 77% and dog allergen by roughly 89% in homes. For the smallest, most penetrating particles of dog dander, reductions reached over 93%.
Beyond filtration, practical steps include washing bedding weekly in hot water, using allergen-proof covers on pillows and mattresses, keeping pets out of the bedroom, and keeping indoor humidity below 50% to discourage dust mites and mold. For pollen allergies, keeping windows closed during high-count days and showering after spending time outdoors removes pollen from your hair and skin before it spreads to your furniture and bedding.
Nasal Rinsing
Saline nasal irrigation, using a neti pot, squeeze bottle, or similar device, physically flushes allergens and mucus out of your nasal passages. It’s a simple, drug-free option you can use alongside other treatments. Hypertonic saline (slightly saltier than your body’s fluids) appears to improve mucus clearance more effectively than regular isotonic saline. There isn’t a universally agreed-upon frequency or method, so experiment with what feels comfortable. Most people find once or twice daily during allergy season is helpful. Always use distilled or previously boiled water to avoid infection.
Immunotherapy for Long-Term Relief
If your allergies are persistent, affect your quality of life despite medications, or you want to reduce your dependence on daily drugs, allergen immunotherapy is the closest thing to a lasting fix. It works by gradually exposing your immune system to increasing amounts of your specific allergen until it learns to tolerate it.
There are two forms. Allergy shots (subcutaneous immunotherapy) involve regular injections at a doctor’s office, typically weekly during a buildup phase and then monthly for maintenance. Sublingual tablets dissolve under your tongue at home daily. Both approaches produce similar results in controlling symptoms and reducing medication use, and sublingual immunotherapy has also shown improvements in lung function for allergy patients with asthma.
Treatment duration varies. In clinical studies, shot-based therapy averaged about 31 months, while sublingual therapy averaged around 19 months. Most allergists recommend continuing for 3 to 5 years to achieve lasting benefit that persists after you stop treatment. It requires patience, but many people find their symptoms are significantly reduced or gone entirely afterward.
Getting the Right Diagnosis
Effective treatment depends on knowing exactly what you’re reacting to. The two standard tests are skin prick testing and blood tests that measure allergen-specific antibodies. Skin prick testing is considered the first-line method in many countries: a tiny amount of allergen is placed on your skin, and a small prick lets it enter just below the surface. A raised bump within 15 to 20 minutes indicates a reaction.
Blood tests serve as a reliable backup, especially when skin testing isn’t practical (widespread eczema, inability to stop antihistamines, or very young children). Both methods show sensitivity and specificity ranging from about 75% to 93%, depending on the specific allergen being tested. In practice, your doctor may use both to build a complete picture, since accuracy can vary from one allergen to another.
Treating Food Allergies
Food allergies require a different approach than respiratory allergies. The foundation is strict avoidance of trigger foods, but accidental exposure is a constant risk. In 2024, the FDA approved the first medication designed to reduce allergic reactions to multiple foods after accidental exposure. It works by binding to the antibody (IgE) that triggers allergic reactions, blocking it from setting off a chain reaction in your body.
In clinical trials, 68% of peanut-allergic participants who received the treatment could tolerate a significant dose of peanut protein without moderate to severe symptoms, compared to just 6% on placebo. Results for other common allergens were similarly striking: 67% for egg (versus 0% on placebo), 66% for milk (versus 11%), and 42% for cashew (versus 3%). The treatment is not a cure and doesn’t replace the need to avoid allergens. It’s a safety net that raises the threshold for a dangerous reaction if accidental exposure happens.
Recognizing and Treating Anaphylaxis
Severe allergic reactions, anaphylaxis, require immediate treatment with epinephrine. International guidelines are clear that injectable epinephrine is the first-line treatment. The clearest triggers for using an auto-injector are cardiovascular symptoms (dizziness, fainting, rapid or weak pulse) and respiratory symptoms (difficulty breathing, wheezing, throat tightness).
If you use an auto-injector and symptoms are severe, don’t improve within 5 minutes, or require a second dose, call emergency services immediately. A poor response after two doses of epinephrine is a recognized marker of a serious reaction that needs hospital-level care. If symptoms are initially mild and resolve quickly after one dose, seeking less-urgent follow-up may be reasonable, but this is a judgment call best discussed with your allergist in advance so you have a plan before a crisis happens.
Medications Worth Knowing About (and Avoiding)
Leukotriene modifiers were once commonly prescribed for allergic rhinitis, but the FDA placed its strongest safety warning on the most well-known version in 2020 due to reports of serious mood and behavioral changes, including suicidal thoughts. These medications are now recommended only when other treatments haven’t worked. If you’re currently taking one and haven’t discussed the risks with your prescriber, it’s worth a conversation.
Decongestant nasal sprays (oxymetazoline) provide rapid relief from stuffiness but should never be used for more than 3 consecutive days. Longer use causes rebound congestion that’s worse than the original problem. Oral decongestants like pseudoephedrine can raise blood pressure and aren’t appropriate for everyone. Eye drops containing antihistamines or mast cell stabilizers work well for itchy, watery eyes and can be used alongside oral medications and nasal sprays without overlap concerns.