For most people with allergies, a steroid nasal spray is the single most effective over-the-counter option. If your main complaints are sneezing, runny nose, and itchy eyes, a daily oral antihistamine like cetirizine (Zyrtec), loratadine (Claritin), or fexofenadine (Allegra) will help. But if nasal congestion is part of the picture, nasal sprays outperform pills across the board. The “best” choice depends on your specific symptoms, how fast you need relief, and whether drowsiness matters to you.
Nasal Sprays Are the Top-Rated Option
Clinical guidelines from the American Academy of Otolaryngology rank intranasal corticosteroids as the most effective medication class for both mild and moderate-to-severe allergic rhinitis. These sprays, including fluticasone (Flonase), budesonide (Rhinocort), and triamcinolone (Nasacort), reduce congestion, sneezing, runny nose, and even eye symptoms better than oral antihistamines or leukotriene blockers. A large review published in the Journal of Allergy and Clinical Immunology confirmed that intranasal treatments were more effective than oral medications at improving nasal symptoms, eye symptoms, and overall quality of life.
The trade-off is patience. Steroid nasal sprays take several days of consistent use before they reach full effectiveness, so they work best as a daily preventive rather than a rescue medication. Adults 12 and older typically use two sprays in each nostril once daily. Children ages 4 to 11 use one spray per nostril. If you only get occasional symptoms on high-pollen days, a pill you can take as needed may be more practical.
How the Three Main Antihistamine Pills Compare
Cetirizine, loratadine, and fexofenadine are all second-generation antihistamines, meaning they cause far less drowsiness than older options like diphenhydramine (Benadryl). They’re all available over the counter and work well for sneezing, itching, runny nose, and watery eyes. Where they differ is speed, sedation, and convenience.
Cetirizine (Zyrtec) starts working in about one hour and is often considered the strongest of the three for symptom relief. The downside: it’s the most likely of the modern antihistamines to cause some drowsiness, especially at first. You take it once a day.
Fexofenadine (Allegra) also kicks in within about an hour and is the least sedating option. It’s a solid choice if you need to stay sharp during the day. One important quirk: grapefruit, orange, and apple juice can block the body’s ability to absorb fexofenadine, making it less effective. The FDA recommends taking it with water, not fruit juice.
Loratadine (Claritin) is the slowest to start, with effects beginning somewhere between one and three hours after a dose. It causes minimal drowsiness and is taken once daily. For people whose symptoms are predictable, the slower onset isn’t a problem if you take it each morning before heading outside.
When Congestion Is Your Biggest Problem
Oral antihistamines are good at stopping sneezing, itching, and a runny nose, but they do relatively little for a stuffed-up nose. That’s where steroid nasal sprays shine. If congestion is your primary complaint, a daily nasal spray will likely do more for you than any pill.
Decongestant nasal sprays like oxymetazoline (Afrin) open nasal passages within minutes, which can feel like a miracle. But you should not use them for more than three consecutive days. Longer use can trigger rebound congestion, a condition called rhinitis medicamentosa, where your stuffiness actually gets worse the more you spray. Oral decongestants (pseudoephedrine, phenylephrine) don’t carry that same rebound risk but can raise blood pressure and cause insomnia, so they’re not ideal for long-term use either.
Many people find the best relief by combining a steroid nasal spray with an oral antihistamine. This covers congestion through the spray and controls itching and sneezing through the pill.
Best Options for Hives and Skin Reactions
If your allergies show up on your skin rather than in your nose, the approach is a bit different. For hives and itching, non-drowsy antihistamines like cetirizine and loratadine are the standard first step. Cetirizine tends to be particularly effective for skin-related symptoms.
For chronic hives that don’t respond to a standard dose, doctors sometimes recommend increasing the dose of a second-generation antihistamine beyond what’s listed on the box. This should only be done under medical guidance. If nighttime itching is the main issue, diphenhydramine (Benadryl) can help because its sedating effect doubles as a sleep aid, though it wears off every four to six hours.
Allergy Medicine for Children
Most over-the-counter allergy medicines come in liquid or chewable forms for kids. Cetirizine (Zyrtec) can be used in children as young as 6 months, loratadine (Claritin) starting at age 2, and fexofenadine (Allegra) starting at age 2. Diphenhydramine (Benadryl) should not be given to children under 2, and its doses are based on weight rather than age alone.
For nasal sprays, Nasacort is approved for children 2 and older, while Flonase is generally recommended starting at age 4. Children typically use one spray per nostril instead of two. For any child under 2, talk with a pediatrician before giving allergy medication.
Allergy Medicine During Pregnancy
Loratadine and cetirizine are the antihistamines most commonly considered acceptable during pregnancy, according to Mayo Clinic guidance. For more persistent symptoms, steroid nasal sprays like budesonide, fluticasone, or mometasone can be added at the lowest effective dose. Oxymetazoline nasal spray can be used for up to three days if congestion is severe. Older antihistamines like diphenhydramine have a longer track record in pregnancy but carry the usual sedation concerns.
Picking the Right Medicine for Your Symptoms
The quickest way to choose is to match the medicine to the symptom that bothers you most:
- Congestion: Start with a steroid nasal spray (Flonase, Nasacort, or Rhinocort) used daily.
- Sneezing and itchy or watery eyes: A once-daily oral antihistamine works well. Cetirizine is the fastest and strongest, fexofenadine is the least sedating.
- Everything at once: Combine a nasal spray with an oral antihistamine.
- Hives or skin itching: Cetirizine or loratadine during the day, diphenhydramine at bedtime if needed.
- Fast relief for a single bad day: Cetirizine or fexofenadine, which both start working within an hour.
If you’ve been taking the same antihistamine for a while and feel like it’s losing its edge, switching to a different one in the same class sometimes helps. There’s no strong evidence that your body builds true tolerance to these medications, but individual responses vary, and trying a different option costs little in time or money. Generic versions of all three major antihistamines are widely available and work identically to the brand names.