The best thing to take for a runny nose depends on what’s causing it. Antihistamines work well for allergy-related runny noses, while decongestants and saline rinses are better options for colds. Most people get the best relief by matching their treatment to their specific symptoms rather than grabbing whatever is on the shelf.
Figure Out the Cause First
A runny nose from allergies and one from a cold feel different, and they respond to different treatments. A few quick clues can help you sort it out. If your eyes are itchy and watery, you almost certainly have allergies. If you have a sore throat, cough, or low fever, it’s likely a cold virus. Allergies never cause a fever, while colds often do. Colds also tend to resolve within 3 to 10 days, while allergy symptoms can persist for weeks as long as you’re exposed to the trigger.
This distinction matters because antihistamines, the most commonly recommended option for a runny nose, are specifically designed for allergic reactions. Taking them for a cold-related runny nose may help slightly, but you’ll get better results from other options.
Antihistamines for Allergies
If your runny nose comes with itchy eyes, sneezing, and no fever, an over-the-counter antihistamine is your best bet. These block the chemical your immune system releases in response to pollen, dust, or pet dander, which directly reduces the flood of watery mucus.
You’ll find two generations on the shelf. Newer, second-generation antihistamines (cetirizine, loratadine, fexofenadine) are generally more effective for allergic runny noses and last longer, typically covering you for a full 24 hours with one dose. They also cause far less drowsiness because they don’t cross into the brain the way older formulas do.
First-generation antihistamines like diphenhydramine (Benadryl) do still reduce a runny nose, partly because they block both histamine and the nerve signals that trigger mucus production. That broader action can help with non-allergic runny noses too. The tradeoff is significant drowsiness, dry mouth, and a shorter duration of action, meaning you’ll need to redose every four to six hours.
Decongestants for Colds
Decongestants shrink swollen blood vessels inside the nose. When those vessels constrict, blood flow to the nasal lining drops, which reduces both swelling and the plasma leaking out as watery discharge. They’re primarily marketed for stuffiness, but they do cut down on the dripping that comes with a cold.
Nasal spray decongestants (oxymetazoline, sold as Afrin) work fast, often within minutes. But there’s an important limit: don’t use them for more than three days. After that, you risk rebound congestion, a condition where the spray itself starts causing the stuffiness it was meant to fix. This can trap people in a cycle of dependency that’s difficult to break.
For oral decongestants, check the active ingredient carefully. The FDA has proposed removing oral phenylephrine from store shelves after an expert panel unanimously concluded it doesn’t actually work as a nasal decongestant at the recommended dose. This affects a huge number of cold products, including many daytime formulas. Look for pseudoephedrine instead, which is kept behind the pharmacy counter in most states but doesn’t require a prescription.
Saline Nasal Rinses
If you’d rather avoid medication altogether, or want something to use alongside it, a saline nasal rinse is one of the most effective non-drug options. Rinsing your nasal passages with salt water thins out thick mucus, flushes away allergens and irritants, and reduces the swelling that triggers excess drainage. It works for both colds and allergies.
You can use a squeeze bottle, neti pot, or bulb syringe. The container you choose doesn’t matter much, since they all perform equally well. What does matter is the water. Don’t use plain tap water, which can contain trace amounts of organisms you don’t want in your sinuses. Use distilled water, previously boiled water that’s been cooled, or water run through a filter rated for organism removal (the CDC publishes guidance on which filters qualify). Rinsing once or twice a day is typical during active symptoms.
Prescription Nasal Sprays
When over-the-counter options aren’t enough, a prescription anticholinergic nasal spray (ipratropium bromide) targets the runny nose directly. It works by blocking the nerve signals that tell your nasal glands to produce mucus. It’s approved for both allergic and non-allergic runny noses in adults and children six and older.
This spray is narrowly focused. It reduces the dripping but won’t help with congestion, sneezing, or postnasal drip. That specificity makes it a good add-on when a runny nose is your dominant symptom and antihistamines alone aren’t cutting it. Very little of the medication is absorbed into the body, so systemic side effects are minimal.
Humidity and Hydration
Dry air irritates nasal passages and can make a runny nose worse by triggering your body to produce more protective mucus. Running a humidifier, especially in your bedroom at night, helps keep the nasal lining moist and comfortable. Aim for indoor humidity between 30% and 50%. Going above 50% encourages mold and dust mite growth, which can create new allergy triggers.
Drinking plenty of fluids also thins mucus from the inside, making it easier to clear. Warm liquids like tea or broth can feel especially soothing because the steam provides a mild decongestant effect as you drink.
What to Know for Children
Most over-the-counter cold and cough products are labeled “do not use in children under 4 years of age.” The FDA goes further, recommending against these medications in children younger than 2 because of the risk of serious, potentially life-threatening side effects. This includes homeopathic cold products, which have been linked to seizures, allergic reactions, and difficulty breathing in young children.
For kids under four, saline drops and gentle suction with a bulb syringe are the safest approach. A cool-mist humidifier in the child’s room can also help. For children four and older, follow the dosing instructions on the specific product carefully, since children’s doses are weight- and age-dependent.