For most people with allergies, a second-generation antihistamine like cetirizine (Zyrtec), loratadine (Claritin), or fexofenadine (Allegra) is the simplest starting point. These are available over the counter, taken once a day, and unlikely to make you drowsy. But antihistamines are only one option. Depending on the type and severity of your symptoms, nasal sprays, eye drops, decongestants, or even long-term immunotherapy may work better, either alone or in combination.
Antihistamine Pills: The Most Common Choice
Antihistamines block histamine, the chemical your immune system releases during an allergic reaction. Histamine is what causes sneezing, itching, a runny nose, and watery eyes. There are two generations of antihistamines, and the difference matters.
Second-generation antihistamines (cetirizine, loratadine, fexofenadine) are the ones most people reach for. They don’t easily cross into the brain, so they rarely cause drowsiness. You take them once a day, and they work well for sneezing, itching, and a runny nose. Current international guidelines rank oral antihistamines as a solid option for allergic rhinitis, though nasal steroid sprays are considered even more effective for moderate to severe symptoms.
First-generation antihistamines, like diphenhydramine (Benadryl), still work. But they cross into the brain much more readily, causing significant drowsiness and slowed reaction times. You should not drive or operate machinery after taking one. They also interact with more medications. These older antihistamines are best reserved for nighttime use or situations where drowsiness isn’t a concern.
Nasal Steroid Sprays
If your main complaints are a stuffy, congested nose along with sneezing and postnasal drip, a nasal corticosteroid spray is likely the most effective single treatment you can use. Options like fluticasone (Flonase), triamcinolone (Nasacort), and budesonide (Rhinocort) are all available without a prescription. They work by reducing inflammation in the lining of your nasal passages, which calms the whole cascade of allergy symptoms at the source rather than just blocking one chemical like antihistamines do.
The tradeoff is patience. Nasal steroid sprays don’t provide instant relief the way a pill might. Most people need to use them daily for several days to a couple of weeks before they reach full effectiveness. For that reason, starting them a week or two before allergy season hits can give you a head start. They’re safe for long-term daily use throughout a season, and the amount of steroid absorbed into your body is very low.
Decongestants: Powerful but Limited
Decongestants shrink swollen blood vessels in your nasal passages, which opens up airflow quickly. They come in two forms, and the rules for each are very different.
Nasal decongestant sprays containing oxymetazoline (Afrin) or phenylephrine (Neo-Synephrine) work within minutes. But you cannot use them for more than three days. After about three days, these sprays cause rebound congestion, a condition called rhinitis medicamentosa, where your nose becomes more blocked than it was before you started. This can create a cycle that’s difficult to break.
Oral decongestants like pseudoephedrine (Sudafed) don’t carry the same rebound risk. They can be used for longer stretches, though they may raise blood pressure or cause jitteriness in some people. Pseudoephedrine is kept behind the pharmacy counter in many states, so you’ll need to ask for it, but no prescription is required.
Eye Drops for Itchy, Watery Eyes
If your allergies hit your eyes hardest, oral antihistamines may not be enough. Antihistamine eye drops deliver relief directly where you need it. The most widely available over-the-counter option is ketotifen (Zaditor, Alaway), which does double duty: it blocks histamine receptors in the eye and also stabilizes mast cells, the immune cells that release histamine in the first place. This combination means it helps with both immediate itching and longer-term eye irritation.
Prescription options like olopatadine and alcaftadine work similarly, combining antihistamine and mast cell stabilizing effects. If ketotifen alone isn’t cutting it, these are worth discussing with your doctor.
Saline Nasal Rinses
Rinsing your nasal passages with salt water is one of the simplest, drug-free ways to manage allergy symptoms. A neti pot or squeeze bottle flushes out pollen, dust, and other allergens physically, reducing the amount of irritant sitting on your nasal lining. One study found that people with chronic sinus issues who rinsed daily saw symptom severity improve by more than 60%. Even for seasonal allergies, rinsing after time outdoors can noticeably reduce congestion and postnasal drip.
The one safety rule that matters: never use tap water. Tap water can contain bacteria that are harmless when swallowed (your stomach acid handles them) but dangerous when introduced into nasal passages. Use distilled water, or boil tap water and let it cool first. Mix about 1 teaspoon of a salt-and-baking-soda blend into 8 ounces of lukewarm water.
Immunotherapy for Long-Term Relief
If you’ve tried multiple medications and still struggle through allergy season, immunotherapy is the only treatment that can retrain your immune system to stop overreacting to allergens. It comes in two forms: allergy shots (given in a doctor’s office) and allergy drops or tablets (placed under the tongue daily at home).
Both approaches work by exposing your immune system to tiny, gradually increasing amounts of the allergen. Most people taking sublingual drops notice improvement within three to four months. But the full course of treatment runs three to five years, because safely reprogramming an immune response takes time. The payoff is that many people experience lasting relief even after stopping treatment, something no pill or spray can offer.
Allergy shots follow a similar timeline and require regular visits to a clinic, since they carry a small risk of allergic reaction that needs to be monitored. Drops and tablets have a lower risk profile, which is why they can be taken at home.
Allergy Medications for Children
Most of the same medications used by adults are available for children, but age limits vary by product. Cetirizine (Zyrtec) is approved in syrup form for infants as young as 6 months. Loratadine (Claritin) and fexofenadine (Allegra) can be used starting at age 2, in syrup or chewable forms. Diphenhydramine (Benadryl) should not be given to children under 2.
For nasal steroid sprays, triamcinolone (Nasacort), budesonide (Rhinocort), and cromolyn sodium (Nasalcrom) are approved for children as young as 2. Fluticasone (Flonase) is approved starting at age 4. For any child under 2, talk to their pediatrician before giving allergy medication.
Conditions That Affect Your Options
Certain health conditions narrow which allergy medications are safe for you. If you have narrow-angle glaucoma, antihistamines and decongestants can trigger a dangerous spike in eye pressure. This applies to both older antihistamines like diphenhydramine and newer ones like loratadine, cetirizine, and fexofenadine, as well as combination cold medications containing these ingredients. If you have open-angle glaucoma, steroid-based treatments (including nasal steroid sprays) can worsen your eye pressure over time.
People with high blood pressure should be cautious with oral decongestants like pseudoephedrine, which can raise blood pressure further. An enlarged prostate is another concern with first-generation antihistamines, which can make urination more difficult. If any of these apply to you, a pharmacist can help you identify which OTC options are safest.
When Allergies Become Dangerous
Severe allergic reactions, called anaphylaxis, are a medical emergency that antihistamines cannot treat. If you experience shortness of breath, throat tightness, trouble swallowing, a weak pulse, or a combination of symptoms across multiple body systems (such as hives plus vomiting or abdominal pain), epinephrine is the only effective treatment. Antihistamines will not reverse airway swelling or raise dangerously low blood pressure.
If you carry an epinephrine auto-injector, use it at the first sign of a severe reaction. When in doubt, use it anyway. The risks of an unnecessary dose are far smaller than the risks of delaying treatment. Notably, between 10 and 20 percent of life-threatening allergic reactions have no skin symptoms at all, so don’t wait for hives to appear before acting.